Categories
The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
(first | last) View (previous 3,000 | next 3,000) (20 | 50 | 100 | 250 | 500)- Rosaceae tribe Gillenieae (38 members)
- Rosaceae tribe Kerrieae (8 members)
- Rosaceae tribe Lyonothamneae (2 members)
- Rosaceae tribe Neillieae (4 members)
- Rosaceae tribe Potentilleae (28 members)
- Rosaceae tribe Roseae (2 members)
- Rosaceae tribe Rubeae (2 members)
- Rosaceae tribe Sorbarieae (6 members)
- Rosaceae tribe Spiraeeae (12 members)
- Rosaceae tribe Ulmarieae (2 members)
- Rostraria (1 member)
- Rosulabryum (13 members)
- Rotala (3 members)
- Rottboellia (1 member)
- Roystonea (1 member)
- Rubus (40 members)
- Rubus arcticus (3 members)
- Rubus idaeus (2 members)
- Rubus leucodermis (2 members)
- Rudbeckia (6 members)
- Rudbeckia fulgida (7 members)
- Rudbeckia grandiflora (2 members)
- Rudbeckia hirta (4 members)
- Rudbeckia laciniata (5 members)
- Rudbeckia sect. Dracopis (1 member)
- Rudbeckia sect. Macrocline (14 members)
- Rudbeckia sect. Rudbeckia (13 members)
- Rudbeckia triloba (3 members)
- Rugelia (1 member)
- Rugosa (1 member)
- Rumex (8 members)
- Rumex sect. Axillares (21 members)
- Rumex sect. Rumex (32 members)
- Rumex subg. Acetosa (5 members)
- Rumex subg. Acetosella (4 members)
- Rumex subg. Platypodium (1 member)
- Rumex subg. Rumex (4 members)
- Ruppia (2 members)
- Ruppiaceae (2 members)
- Russelia (1 member)
- Rutenbergiaceae (2 members)
- Rytidosperma (3 members)
- Sabal (5 members)
- Saccharum (10 members)
- Saccharum brevibarbe (2 members)
- Sacciolepis (2 members)
- Sachsia (1 member)
- Sacoila (3 members)
- Sacoila lanceolata (2 members)
- Saelania (1 member)
- Sageretia (3 members)
- Sagina (13 members)
- Sagina decumbens (2 members)
- Sagina maxima (2 members)
- Sagina nodosa (2 members)
- Sagittaria (28 members)
- Sagittaria graminea (3 members)
- Sagittaria guayanensis (1 member)
- Sagittaria lancifolia (2 members)
- Sagittaria montevidensis (3 members)
- Sairocarpus (11 members)
- Sairocarpus cornutus (2 members)
- Sairocarpus vexillocalyculatus (3 members)
- Salicaceae (8 members)
- Salicornia (4 members)
- Salix (10 members)
- Salix alaxensis (2 members)
- Salix brachycarpa (2 members)
- Salix calcicola (2 members)
- Salix exigua (2 members)
- Salix glauca (4 members)
- Salix humilis (2 members)
- Salix lasiandra (2 members)
- Salix ovalifolia (4 members)
- Salix rotundifolia (2 members)
- Salix sect. Arbuscella (1 member)
- Salix sect. Argyrocarpae (1 member)
- Salix sect. Canae (1 member)
- Salix sect. Candidae (1 member)
- Salix sect. Chamaetia (3 members)
- Salix sect. Cinerella (10 members)
- Salix sect. Cordatae (7 members)
- Salix sect. Daphnella (1 member)
- Salix sect. Diplodictyae (4 members)
- Salix sect. Floridanae (1 member)
- Salix sect. Fulvae (1 member)
- Salix sect. Geyerianae (3 members)
- Salix sect. Glaucae (5 members)
- Salix sect. Griseae (1 member)
- Salix sect. Hastatae (18 members)
- Salix sect. Helix (1 member)
- Salix sect. Herbella (5 members)
- Salix sect. Humboldtianae (7 members)
- Salix sect. Lanatae (4 members)
- Salix sect. Maccallianae (1 member)
- Salix sect. Mexicanae (3 members)
- Salix sect. Myrtilloides (4 members)
- Salix sect. Myrtosalix (5 members)
- Salix sect. Nigricantes (1 member)
- Salix sect. Ovalifoliae (4 members)
- Salix sect. Phylicifoliae (5 members)
- Salix sect. Salicaster (5 members)
- Salix sect. Salix (4 members)
- Salix sect. Setchellianae (1 member)
- Salix sect. Sitchenses (4 members)
- Salix sect. Subalbae (3 members)
- Salix sect. Triandrae (1 member)
- Salix sect. Villosae (4 members)
- Salix sect. Viminella (1 member)
- Salix subg. Chamaetia (16 members)
- Salix subg. Longifoliae (8 members)
- Salix subg. Protitea (4 members)
- Salix subg. Salix (10 members)
- Salix subg. Vetrix (38 members)
- Salix wolfii (2 members)
- Salsola (7 members)
- Salsola kali (2 members)
- Salvinia (1 member)
- Salviniaceae (2 members)
- Samolus (3 members)
- Sandbergia (2 members)
- Sanguinaria (1 member)
- Sanguisorba (4 members)
- Sanionia (4 members)
- Sansevieria (1 member)
- Santalaceae (4 members)
- Santalum (1 member)
- Santolina (1 member)
- Sanvitalia (3 members)
- Saponaria (2 members)
- Sapotaceae (10 members)
- Sarcobatus (2 members)
- Sarcocornia (3 members)
- Sarcodes (1 member)
- Sarmentypnum (5 members)
- Sarracenia (14 members)
- Sarracenia alabamensis (2 members)
- Sarracenia purpurea (2 members)
- Sarracenia rubra (2 members)
- Sarraceniaceae (4 members)
- Sartwellia (1 member)
- Sassafras (1 member)
- Saururaceae (4 members)
- Saururus (1 member)
- Saussurea (8 members)
- Saussurea amara (1 member)
- Saussurea angustifolia (3 members)
- Saxifraga (29 members)
- Saxifraga bronchialis (2 members)
- Saxifraga flagellaris (3 members)
- Saxifraga oppositifolia (2 members)
- Saxifraga rivularis (2 members)
- Saxifragaceae (46 members)
- Saxifragopsis (1 member)
- Scabrethia (2 members)
- Scabrethia scabra (3 members)
- Schaefferia (2 members)
- Schedonnardus (1 member)
- Schedonorus (3 members)
- Scheuchzeria (1 member)
- Scheuchzeriaceae (2 members)
- Schiedeella (1 member)
- Schisandra (1 member)
- Schisandraceae (2 members)
- Schismus (2 members)
- Schistidium (30 members)
- Schistophragma (1 member)
- Schistostega (1 member)
- Schistostegaceae (2 members)
- Schizachne (1 member)
- Schizachyrium (11 members)
- Schizachyrium sanguineum (2 members)
- Schizachyrium scoparium (3 members)
- Schizaea (1 member)
- Schizaeaceae (4 members)
- Schkuhria (2 members)
- Schlotheimia (2 members)
- Schoenobryum (1 member)
- Schoenocaulon (3 members)
- Schoenolirion (3 members)
- Schoenoplectus (8 members)
- Schoenoplectus acutus (2 members)
- Schoenoplectus erectus (1 member)
- Schoenoplectus purshianus (2 members)
- Schoenoplectus sect. Actaeogeton (5 members)
- Schoenoplectus sect. Malacogeton (3 members)
- Schoenoplectus sect. Schoenoplectus (9 members)
- Schoenoplectus sect. Supini (4 members)
- Schoenoplectus smithii (3 members)
- Schoenus (1 member)
- Schoepfia (1 member)
- Schoepfiaceae (2 members)
- Schwalbea (1 member)
- Schwetschkeopsis (1 member)
- Scilla (1 member)
- Scirpus (18 members)
- Sciuro-hypnum (11 members)
- Scleranthus (4 members)
- Scleranthus annuus (1 member)
- Scleranthus perennis (1 member)
- Scleria (16 members)
- Scleria ciliata (3 members)
- Scleria pauciflora (2 members)
- Sclerocactus (15 members)
- Sclerocarpus (1 member)
- Sclerochloa (1 member)
- Sclerolepis (1 member)
- Sclerolinon (1 member)
- Scleropodium (7 members)
- Scleropodium touretii (2 members)
- Scleropogon (1 member)
- Scoliopus (2 members)
- Scolochloa (1 member)
- Scolymus (2 members)
- Scoparia (2 members)
- Scopelophila (2 members)
- Scopulophila (1 member)
- Scorpidium (3 members)
- Scorzonera (2 members)
- Scouleria (2 members)
- Scouleriaceae (2 members)
- Scribneria (1 member)
- Scrophularia (11 members)
- Scrophulariaceae (18 members)
- Secale (2 members)
- Sedella (3 members)
- Sedum (49 members)
- Sedum lanceolatum (2 members)
- Sedum laxum (5 members)
- Sedum obtusatum (4 members)
- Sedum oreganum (2 members)
- Sedum radiatum (3 members)
- Sedum spathulifolium (2 members)
- Sedum stenopetalum (2 members)
- Sedum wrightii (2 members)
- Selaginella (6 members)
- Selaginella arenicola (2 members)
- Selaginella mutica (2 members)
- Selaginella subg. Selaginella (1 member)
- Selaginella subg. Stachygynandrum (11 members)
- Selaginella subg. Tetragonostachys (29 members)
- Selaginellaceae (2 members)
- Selenia (4 members)
- Selenicereus (3 members)
- Seligeria (13 members)
- Seligeriaceae (6 members)
- Sematophyllaceae (18 members)
- Sematophyllum (4 members)
- Sempervivum (1 member)
- Senecio (63 members)
- Senecio amplectens (2 members)
- Senecio bigelovii (2 members)
- Senecio eremophilus (3 members)
- Senecio flaccidus (3 members)
- Senecio fremontii (4 members)
- Senecio integerrimus (5 members)
- Senecio multidentatus (1 member)
- Senecio serra (2 members)
- Sequoia (1 member)
- Sequoiadendron (1 member)
- Serenoa (1 member)
- Sericocarpus (6 members)
- Sericocarpus oregonensis (2 members)
- Sesamum (1 member)
- Sesleria (4 members)
- Sesuvium (4 members)
- Setaria (8 members)
- Setaria pumila (2 members)
- Setaria reverchonii (3 members)
- Setaria subg. Paurochaetium (1 member)
- Setaria subg. Ptychophyllum (3 members)
- Setaria subg. Reverchoniae (2 members)
- Setaria subg. Setaria (24 members)
- Setaria viridis (2 members)
- Setariopsis (1 member)
- Seymeria (7 members)
- Seymeria falcata (1 member)
- Seymeria pectinata (2 members)
- Shape (126 members)
- Shepherdia (3 members)
- Shinnersia (1 member)
- Shinnersoseris (1 member)
- Shortia (2 members)
- Shortia galacifolia (2 members)
- Sibara (2 members)
- Sibaropsis (1 member)
- Sibbaldia (1 member)
- Sibbaldiopsis (1 member)
- Sicyos (4 members)
- Sicyosperma (1 member)
- Sida (20 members)
- Sida elliottii (2 members)
- Sidalcea (36 members)
- Sidalcea asprella (2 members)
- Sidalcea calycosa (2 members)
- Sidalcea hickmanii (7 members)
- Sidalcea malviflora (7 members)
- Sidalcea oregana (5 members)
- Sidastrum (1 member)
- Sideroxylon (13 members)
- Sideroxylon lanuginosum (3 members)
- Sideroxylon reclinatum (2 members)
- Sidotheca (3 members)
- Sieversia (1 member)
- Silene (83 members)
- Silene campanulata (0 members)
- Silene caroliniana (3 members)
- Silene conica (1 member)
- Silene dichotoma (1 member)
- Silene douglasii (3 members)
- Silene drummondii (2 members)
- Silene flos-cuculi (1 member)
- Silene greenei (2 members)
- Silene hookeri (2 members)
- Silene involucrata (2 members)
- Silene laciniata (3 members)
- Silene scouleri (3 members)
- Silene uralensis (3 members)
- Silene viscaria (1 member)
- Silphium (17 members)
- Silphium asteriscus (5 members)
- Silphium integrifolium (2 members)
- Silphium perfoliatum (2 members)
- Silphium radula (2 members)
- Silphium terebinthinaceum (2 members)
- Silybum (1 member)
- Simmondsia (1 member)
- Simmondsiaceae (2 members)
- Simsia (2 members)
- Sinapis (2 members)
- Sinosenecio (1 member)
- Sisymbrium (8 members)
- Sisyrinchium (39 members)
- Sisyrinchium idahoense (4 members)
- Sisyrinchium montanum (2 members)
- Size (1,454 members)
- Smallanthus (1 member)
- Smelowskia (7 members)
- Smilacaceae (2 members)
- Smilax (20 members)
- Soleirolia (1 member)
- Solidago (4 members)
- Solidago (sect. Solidago) ser. Argutae (9 members)
- Solidago (sect. Solidago) ser. Auriculatae (1 member)
- Solidago (sect. Solidago) ser. Brachychaeta (1 member)
- Solidago (sect. Solidago) ser. Drummondiani (1 member)
- Solidago (sect. Solidago) ser. Odorae (2 members)
- Solidago (sect. Solidago) ser. Venosae (7 members)
- Solidago altissima (2 members)
- Solidago arguta (4 members)
- Solidago arguta subsp. arguta (2 members)
- Solidago arguta subsp. caroliniana (2 members)
- Solidago caesia (2 members)
- Solidago canadensis (2 members)
- Solidago curtisii (2 members)
- Solidago lepida (4 members)
- Solidago nemoralis (2 members)
- Solidago odora (2 members)
- Solidago patula (2 members)
- Solidago puberula (2 members)
- Solidago rigida (3 members)
- Solidago rugosa (6 members)
- Solidago rugosa subsp. aspera (1 member)
- Solidago rugosa subsp. rugosa (2 members)
- Solidago sect. Ptarmicoidei (7 members)
- Solidago sect. Solidago (22 members)
- Solidago sempervirens (2 members)
- Solidago simplex (9 members)
- Solidago speciosa (4 members)
- Solidago stricta (2 members)
- Solidago subsect. Argutae (6 members)
- Solidago subsect. Glomeruliflorae (10 members)
- Solidago subsect. Humiles (6 members)
- Solidago subsect. Junceae (7 members)
- Solidago subsect. Maritimae (6 members)
- Solidago subsect. Multiradiatae (3 members)
- Solidago subsect. Nemorales (7 members)
- Solidago subsect. Squarrosae (11 members)
- Solidago subsect. Thyrsiflorae (3 members)
- Solidago subsect. Triplinerviae (14 members)
- Solidago subsect. Venosae (6 members)
- Solidago ulmifolia (2 members)
- Solidago velutina (2 members)
- Soliva (3 members)
- Solmsiella (1 member)
- Some measurement (129 members)
- Sonchus (6 members)
- Sonchus arvensis (2 members)
- Sophronanthe (2 members)
- Sorbaria (2 members)
- Sorbus (6 members)
- Sorbus sect. Commixtae (4 members)
- Sorbus sect. Sambucifoliae (1 member)
- Sorbus sect. Sorbus (2 members)
- Sorbus sect. Tianshanicae (2 members)
- Sorbus sitchensis (2 members)
- Sorbus subg. Aria (1 member)
- Sorbus subg. Sorbus (8 members)
- Sorbus subg. Torminaria (1 member)
- Sorghastrum (3 members)
- Sorghum (3 members)
- Sorghum bicolor (3 members)
- Sparaxis (1 member)
- Sparganiaceae (2 members)
- Sparganium (9 members)
- Spartina (13 members)
- Spergula (3 members)
- Spergularia (15 members)
- Spergularia canadensis (2 members)
- Spergularia macrotheca (3 members)
- Spergularia media (1 member)
- Spergularia platensis (1 member)
- Sphaeralcea (33 members)
- Sphaeralcea ambigua (3 members)
- Sphaeralcea angustifolia (2 members)
- Sphaeralcea caespitosa (2 members)
- Sphaeralcea coccinea (2 members)
- Sphaeralcea coulteri (1 member)
- Sphaeralcea fendleri (3 members)
- Sphaeralcea rusbyi (2 members)
- Sphaeromeria (9 members)
- Sphaeromeria potentilloides (2 members)
- Sphagnaceae (2 members)
- Sphagneticola (1 member)
- Sphagnum (18 members)
- Sphagnum fimbriatum (2 members)
- Sphagnum majus (2 members)
- Sphagnum sect. Acutifolia (26 members)
- Sphagnum sect. Cuspidata (30 members)
- Sphagnum sect. Insulosa (1 member)
- Sphagnum sect. Isocladus (2 members)
- Sphagnum sect. Polyclada (1 member)
- Sphagnum sect. Rigida (2 members)
- Sphagnum sect. Sphagnum (12 members)
- Sphagnum sect. Squarrosa (4 members)
- Sphagnum sect. Subsecunda (13 members)
- Sphenopholis (6 members)
- Spinacia (1 member)
- Spiraea (21 members)
- Spiraea alba (2 members)
- Spiraea douglasii (3 members)
- Spiraea splendens (2 members)
- Spiraea tomentosa (2 members)
- Spiranthes (26 members)
- Spiranthes casei (2 members)
- Spiranthes lacera (2 members)
- Spiranthes ovalis (2 members)
- Spirodela (2 members)
- Splachnaceae (10 members)
- Splachnobryaceae (2 members)
- Splachnobryum (1 member)
- Splachnum (6 members)
- Spodiopogon (1 member)
- Sporobolus (34 members)
- Sporobolus compositus (3 members)
- Sporobolus vaginiflorus (2 members)
- Stanleya (8 members)
- Stanleya pinnata (3 members)
- Staphylea (2 members)
- Staphyleaceae (2 members)
- Stebbinsoseris (2 members)
- Stegonia (3 members)
- Stegonia latifolia (2 members)
- Steinchisma (1 member)
- Stellaria (32 members)
- Stellaria borealis (2 members)
- Stellaria cuspidata (2 members)
- Stellaria longipes (2 members)
- Stemodia (3 members)
- Stemonaceae (2 members)
- Stenanthium (2 members)
- Stenocereus (1 member)
- Stenogonum (2 members)
- Stenorrhynchos (1 member)
- Stenotaphrum (1 member)
- Stenotus (5 members)
- Stenotus armerioides (2 members)
- Stenotus lanuginosus (2 members)
- Stephanomeria (16 members)
- Stephanomeria exigua (5 members)
- Stephanomeria virgata (2 members)
- Stereophyllaceae (6 members)
- Stereophyllum (1 member)
- Stevia (10 members)
- Stevia ovata (1 member)
- Stevia plummerae (1 member)
- Stevia salicifolia (1 member)
- Stewartia (2 members)
- Stillingia (7 members)
- Stipa (2 members)
- Stipulicida (2 members)
- Stipulicida setacea (2 members)
- Stokesia (1 member)
- Straminergon (1 member)
- Streptanthella (1 member)
- Streptanthus (39 members)
- Streptanthus carinatus (2 members)
- Streptanthus cordatus (2 members)
- Streptanthus glandulosus (8 members)
- Streptanthus insignis (2 members)
- Streptopus (3 members)
- Striga (2 members)
- Strigosella (1 member)
- Structure (14 members)
- Stuckenia (5 members)
- Stuckenia filiformis (3 members)
- Stylocline (7 members)
- Stylomecon (1 member)
- Stylophorum (1 member)
- Styracaceae (4 members)
- Styrax (6 members)
- Styrax platanifolius (4 members)
- Suaeda (6 members)
- Suaeda sect. Brezia (6 members)
- Suaeda sect. Limbogermen (5 members)
- Suaeda sect. Schanginia (1 member)
- Subularia (2 members)
- Subularia aquatica (1 member)
- Suckleya (1 member)
- Suksdorfia (2 members)
- Sullivantia (4 members)
- Sullivantia hapemanii (2 members)
- Suriana (1 member)
- Surianaceae (2 members)
- Swallenia (1 member)
- Syagrus (1 member)
- Symblepharis (1 member)
- Symphyotrichum (10 members)
- Symphyotrichum concolor (2 members)
- Symphyotrichum drummondii (2 members)
- Symphyotrichum ericoides (2 members)
- Symphyotrichum falcatum (2 members)
- Symphyotrichum foliaceum (4 members)
- Symphyotrichum laeve (4 members)
- Symphyotrichum lanceolatum (5 members)
- Symphyotrichum novi-belgii (4 members)
- Symphyotrichum ontarionis (2 members)
- Symphyotrichum patens (3 members)
- Symphyotrichum pilosum (2 members)
- Symphyotrichum puniceum (2 members)
- Symphyotrichum sect. Conyzopsis (3 members)
- Symphyotrichum sect. Occidentales (14 members)
- Symphyotrichum sect. Symphyotrichum (43 members)
- Symphyotrichum spathulatum (3 members)
- Symphyotrichum subg. Ascendentes (2 members)
- Symphyotrichum subg. Astropolium (5 members)
- Symphyotrichum subg. Chapmaniani (1 member)
- Symphyotrichum subg. Symphyotrichum (6 members)
- Symphyotrichum subg. Virgulus (24 members)
- Symphyotrichum subulatum (5 members)
- Symphyotrichum tenuifolium (2 members)
- Symplocaceae (2 members)
- Symplocarpus (1 member)
- Symplocos (2 members)
- Synedrella (1 member)
- Syngonanthus (1 member)
- Synthlipsis (1 member)
- Synthyris (20 members)
- Synthyris missurica (3 members)
- Syntrichia (17 members)
- Syntrichopappus (2 members)
- Syringodium (1 member)
- Syrrhopodon (7 members)
- Syrrhopodon prolifer (1 member)
- Systenotheca (1 member)
- Syzygium (3 members)
- Taeniatherum (1 member)
- Tagetes (4 members)
- Takakia (2 members)
- Takakiaceae (2 members)
- Talinopsis (1 member)
- Talinum (2 members)
- Talipariti (2 members)
- Talipariti tiliaceum (2 members)
- Tamaricaceae (2 members)
- Tamarix (8 members)
- Tamaulipa (1 member)
- Tanacetum (4 members)
- Taraxacum (15 members)
- Taraxia (4 members)
- Tarenaya (2 members)
- Taxaceae (4 members)
- Taxiphyllum (4 members)
- Taxithelium (1 member)
- Taxodium (2 members)
- Taxodium distichum (2 members)
- Taxus (3 members)
- Tayloria (6 members)
- Tectaria (4 members)
- Teesdalia (2 members)
- Telesonix (2 members)
- Tellima (1 member)
- Tephroseris (6 members)
- Terminalia (4 members)
- Tetrachondraceae (2 members)
- Tetracoccus (3 members)
- Tetradymia (11 members)
- Tetradymia axillaris (2 members)
- Tetragonia (1 member)
- Tetragonotheca (4 members)
- Tetraneuris (12 members)
- Tetraneuris acaulis (4 members)
- Tetraneuris linearifolia (2 members)
- Tetraneuris scaposa (2 members)
- Tetraphidaceae (4 members)
- Tetraphis (3 members)
- Tetraphis pellucida (2 members)
- Tetraplodon (5 members)
- Tetrapteron (2 members)
- Tetrazygia (1 member)
- Tetrodontium (3 members)
- Tetrodontium brownianum (2 members)
- Texture (501 members)
- Thalassia (1 member)
- Thalia (2 members)
- Thalictrum (12 members)
- Thalictrum sect. Anemonella (1 member)
- Thalictrum sect. Heterogamia (11 members)
- Thalictrum sect. Leucocoma (5 members)
- Thalictrum sect. Omalophysa (1 member)
- Thalictrum sect. Physocarpum (2 members)
- Thalictrum sect. Thalictrum (2 members)
- Thamnobryum (2 members)
- Theaceae (6 members)
- Thelesperma (9 members)
- Thelia (3 members)
- Theliaceae (2 members)
- Thelocactus (2 members)
- Thelocactus bicolor (2 members)
- Thelypodiopsis (9 members)
- Thelypodium (19 members)
- Thelypodium howellii (2 members)
- Thelypodium integrifolium (5 members)
- Thelypodium sagittatum (2 members)
- Thelypteridaceae (6 members)
- Thelypteris (16 members)
- Thelypteris grandis (1 member)
- Thelypteris hispidula (1 member)
- Thelypteris ovata (2 members)
- Thelypteris palustris (1 member)
- Thelypteris patens (1 member)
- Thelypteris pilosa (1 member)
- Thelypteris puberula (1 member)
- Thelypteris subg. Amauropelta (1 member)
- Thelypteris subg. Cyclosorus (14 members)
- Thelypteris subg. Goniopteris (3 members)
- Thelypteris subg. Lastrea (1 member)
- Thelypteris subg. Meniscium (2 members)
- Thelypteris subg. Parathelypteris (3 members)
- Thelypteris subg. Stegnogramma (2 members)
- Thelypteris subg. Thelypteris (2 members)
- Themeda (3 members)
- Theophrastaceae (6 members)
- Therorhodion (2 members)
- Thesiaceae (4 members)
- Thesium (1 member)
- Thespesia (1 member)
- Thinopyrum (5 members)
- Thinopyrum intermedium (2 members)
- Thismia (1 member)
- Thladiantha (1 member)
- Thlaspi (2 members)
- Thrinax (2 members)
- Thuidiaceae (8 members)
- Thuidium (5 members)
- Thuidium delicatulum (2 members)
- Thuja (2 members)
- Thurovia (1 member)
- Thymelaea (1 member)
- Thymelaeaceae (8 members)
- Thymophylla (12 members)
- Thymophylla aurea (2 members)
- Thymophylla pentachaeta (4 members)
- Thymophylla setifolia (1 member)
- Thymophylla tenuiloba (4 members)
- Thysanocarpus (5 members)
- Thysanocarpus laciniatus (3 members)
- Thysanolaena (1 member)
- Tiarella (3 members)
- Tiarella trifoliata (3 members)
- Tidestromia (4 members)
- Tidestromia suffruticosa (2 members)
- Tilia (1 member)
- Tillandsia (16 members)
- Tillandsia fasciculata (3 members)
- Timmia (6 members)
- Timmia megapolitana (2 members)
- Timmia norvegica (2 members)
- Timmiaceae (2 members)
- Timmiella (2 members)
- Tinantia (1 member)
- Tipularia (1 member)
- Tithonia (3 members)
- Tofieldia (3 members)
- Toiyabea (1 member)
- Tolmiea (2 members)
- Tolpis (1 member)
- Tolumnia (1 member)
- Tomentypnum (2 members)
- Tonella (2 members)
- Tonestus (4 members)
- Top Level Property (1,391 members)
- Torenia (1 member)
- Torreya (2 members)
- Torreyochloa (3 members)
- Torreyochloa pallida (3 members)
- Tortella (9 members)
- Tortella inclinata (2 members)
- Tortella tortuosa (3 members)
- Tortula (27 members)
- Tortula cuneifolia (1 member)
- Townsendia (27 members)
- Trachycystis (1 member)
- Trachypogon (1 member)
- Trachyxiphium (1 member)
- Tracyina (1 member)
- Tradescantia (31 members)
- Tradescantia occidentalis (2 members)
- Tragia (15 members)
- Tragopogon (5 members)
- Tragus (4 members)
- Transberingia (2 members)
- Transberingia bursifolia (2 members)
- Trapa (1 member)
- Trautvetteria (1 member)
- Treatment (22,979 members)
- Trema (2 members)
- Trematodon (6 members)
- Triadenum (4 members)
- Triadica (1 member)
- Triantha (4 members)
- Triantha occidentalis (3 members)
- Trianthema (1 member)
- Tribolium (1 member)
- Tribulus (2 members)
- Trichloris (2 members)
- Trichocentrum (1 member)
- Trichocoronis (2 members)
- Trichocoronis wrightii (1 member)
- Trichodon (2 members)
- Trichodon cylindricus (2 members)
- Trichomanes (9 members)
- Trichomanes punctatum (1 member)
- Trichoneura (1 member)
- Trichophorum (6 members)
- Trichoptilium (1 member)
- Trichostigma (1 member)
- Trichostomum (9 members)
- Trichostomum tenuirostre (2 members)
- Tridax (1 member)
- Tridens (12 members)
- Tridens flavus (2 members)
- Tridens muticus (2 members)
- Trientalis (3 members)
- Triglochin (4 members)
- Trillium (4 members)
- Trillium chloropetalum (2 members)
- Trillium erectum (2 members)
- Trillium ovatum (2 members)
- Trillium pusillum (2 members)
- Trillium subg. Phyllantherum (24 members)
- Trillium subg. Trillium (18 members)
- Triniteurybia (1 member)
- Triphora (6 members)
- Triphora trianthophoros (1 member)
- Triphysaria (7 members)
- Triphysaria eriantha (2 members)
- Triphysaria versicolor (2 members)
- Triplasis (2 members)
- Tripleurospermum (3 members)
- Tripleurospermum maritimum (2 members)
- Tripogon (1 member)
- Tripsacum (4 members)
- Tripsacum sect. Fasciculata (1 member)
- Tripsacum sect. Tripsacum (2 members)
- Tripterocalyx (4 members)
- Tripterocladium (1 member)
- Triquetrella (1 member)
- Triraphis (1 member)
- Trisetum (10 members)
- Triteleia (15 members)
- Triteleia ixioides (5 members)
- Triteleiopsis (1 member)
- Triticum (12 members)
- Triumfetta (3 members)
- Trixis (3 members)
- Trixis californica (1 member)
- Trollius (3 members)
- Tropaeolaceae (2 members)
- Tropaeolum (1 member)
- Tropidia (1 member)
- Tropidocarpum (3 members)
- Tsuga (4 members)
- Tuberaria (1 member)
- Tuctoria (2 members)
- Tuerckheimia (1 member)
- Tulipa (1 member)
- Tumamoca (1 member)
- Turnera (6 members)
- Turnera coerulea (1 member)
- Turnera diffusa (1 member)
- Turnera ulmifolia (1 member)
- Turneraceae (4 members)
- Turritis (1 member)
- Tussilago (1 member)
- Typha (3 members)
- Typhaceae (2 members)
- Ulmaceae (8 members)
- Ulmus (10 members)
- Ulota (10 members)
- Ulota hutchinsiae (2 members)
- Umbellularia (2 members)
- Umbellularia californica (2 members)
- Uniola (1 member)
- Urena (1 member)
- Urochloa (17 members)
- Uropappus (1 member)
- Urospermum (1 member)
- Urtica (5 members)
- Urtica dioica (3 members)
- Urticaceae (16 members)
- Uvularia (5 members)
- Vaccaria (1 member)
- Vaccinium (20 members)
- Vaccinium erythrocarpum (1 member)
- Vaccinium sect. Batodendron (1 member)
- Vaccinium sect. Cyanococcus (9 members)
- Vaccinium sect. Herpothamnus (1 member)
- Vaccinium sect. Myrtillus (7 members)
- Vaccinium sect. Oxycoccoides (2 members)
- Vaccinium sect. Oxycoccus (2 members)
- Vaccinium sect. Polycodium (1 member)
- Vaccinium sect. Pyxothamnus (1 member)
- Vaccinium sect. Vaccinium (1 member)
- Vaccinium sect. Vitis-idaea (1 member)
- Vahlodea (1 member)
- Vallisneria (1 member)
- Vancouveria (3 members)
- Vanilla (5 members)
- Varilla (1 member)
- Vaseyochloa (1 member)
- Vauquelinia (4 members)
- Vauquelinia californica (3 members)
- Vauquelinia corymbosa (1 member)
- Velezia (1 member)
- Venegasia (1 member)
- Ventenata (1 member)
- Venturiella (2 members)
- Venturiella sinensis (1 member)
- Veratrum (8 members)
- Veratrum album (1 member)
- Veratrum californicum (2 members)
- Veratrum viride (2 members)
- Verbascum (17 members)
- Verbascum lychnitis (1 member)
- Verbascum phoeniceum (1 member)
- Verbascum sinuatum (1 member)
- Verbascum speciosum (1 member)
- Verbascum thapsus (1 member)
- Verbesina (16 members)
- Vernicia (1 member)
- Vernonia (17 members)
- Veronica (36 members)
- Veronica beccabunga (1 member)
- Veronica wormskjoldii (2 members)
- Veronicastrum (1 member)
- Vesicularia (1 member)
- Viguiera (3 members)
- Villadia (1 member)
- Viola (89 members)
- Viola adunca (2 members)
- Viola biflora (2 members)
- Viola canadensis (3 members)
- Viola epipsila (1 member)
- Viola lobata (2 members)
- Viola palmata (2 members)
- Viola pedata (2 members)
- Viola pinetorum (2 members)
- Viola praemorsa (3 members)
- Viola primulifolia (2 members)
- Viola pubescens (2 members)
- Viola purpurea (7 members)
- Viola sagittata (2 members)
- Viola tricolor (1 member)
- Viola umbraticola (1 member)
- Viola walteri (2 members)
- Violaceae (4 members)
- Viscaceae (6 members)
- Viscum (2 members)
- Viscum album (1 member)
- Vitaceae (12 members)
- Vitis (4 members)
- Vitis cinerea (4 members)
- Vitis rotundifolia (2 members)
- Vitis subg. Muscadinia (2 members)
- Vitis subg. Vitis (19 members)
- Vittaria (3 members)
- Vittariaceae (2 members)
- Voitia (2 members)
- Volutaria (1 member)
- Vulpia (8 members)
- Vulpia microstachys (4 members)
- Vulpia octoflora (3 members)
- Waldsteinia (4 members)
- Waltheria (3 members)
- Warea (4 members)
- Warnstorfia (2 members)
- Washingtonia (2 members)
- Watsonia (1 member)
- Websteria (1 member)
- Wedelia (2 members)
- Wedelia acapulcensis (1 member)
- Weissia (10 members)
- Whipplea (1 member)
- Width (70 members)
- Wijkia (1 member)
- Wilhelmsia (1 member)
- Willkommia (1 member)
- Wislizenia (3 members)
- Wissadula (3 members)
- Wolffia (5 members)
- Wolffiella (3 members)
- Woodsia (13 members)
- Woodsia obtusa (2 members)
- Woodsia oregana (2 members)
- Woodsia scopulina (3 members)
- Woodwardia (3 members)
- Wyethia (8 members)
- Xanthisma (8 members)
- Xanthisma grindelioides (2 members)
- Xanthisma sect. Blepharodon (5 members)
- Xanthisma sect. Havardii (1 member)
- Xanthisma sect. Sideranthus (4 members)
- Xanthisma sect. Xanthisma (2 members)
- Xanthisma spinulosum (5 members)
- Xanthisma texanum (3 members)
- Xanthium (2 members)
- Xanthocephalum (1 member)
- Xanthorhiza (1 member)
- Xerochrysum (1 member)
- Xerophyllum (2 members)
- Ximenia (2 members)
- Ximenia americana (1 member)
- Ximeniaceae (2 members)
- Xylococcus (1 member)
- Xylorhiza (10 members)
- Xylorhiza tortifolia (2 members)
- Xylosma (1 member)
- Xyridaceae (2 members)
- Xyris (24 members)
- Xyris difformis (3 members)
- Xyris laxifolia (1 member)
- Xyris stricta (2 members)
- Yermo (1 member)
- Youngia (1 member)
- Yucca (32 members)
- Yucca angustissima (4 members)
- Yucca baccata (2 members)
- Yucca elata (2 members)
- Yucca gloriosa (2 members)
- Zaluzania (1 member)
- Zamia (1 member)
- Zamiaceae (2 members)
- Zannichellia (1 member)
- Zannichelliaceae (2 members)
- Zea (5 members)
- Zea mays (4 members)
- Zelometeorium (1 member)
- Zenobia (1 member)
- Zephyranthes (16 members)
- Zeuxine (1 member)
- Zigadenus (15 members)
- Zigadenus venenosus (2 members)
- Zingiber (1 member)
- Zingiberaceae (8 members)
- Zinnia (5 members)
- Zizania (6 members)
- Zizania aquatica (2 members)
- Zizania palustris (2 members)
- Zizaniopsis (1 member)
- Ziziphus (6 members)
- Zostera (2 members)
- Zosteraceae (4 members)
- Zoysia (3 members)
- Zuckia (2 members)
- Zuckia brandegeei (3 members)
- Zygodon (6 members)
- Zygodon viridissimus (3 members)
- Zygophyllaceae (12 members)
- Zygophyllum (1 member)
- ×achnella (1 member)
- ×agropogon (1 member)
- ×arctodupontia (1 member)
- ×dupoa (1 member)
- ×elyhordeum (10 members)
- ×elyleymus (11 members)
- ×leydeum (3 members)
- ×pascoleymus (1 member)
- ×pseudelymus (1 member)
- ×pucciphippsia (1 member)