Caulanthus lasiophyllus

(Hooker & Arnott) Payson

Ann. Missouri Bot. Gard. 9: 303. 1923.

Basionym: Turritis lasiophylla Hooker & Arnott Bot. Beechey Voy., 321. 1838
Synonyms: Caulanthus lasiophyllus var. inalienus (B. L. Robinson) Payson Caulanthus lasiophyllus var. rigidus (Greene) Payson Caulanthus lasiophyllus var. utahensis (Rydberg) Payson Erysimum retrofractum (Greene) Greene Guillenia inaliena (Hooker & Arnott) O. E. Schulz Guillenia lasiophylla M. E. Jones Guillenia rigida Harvey ex Torrey Microsisymbrium lasiophyllum (Hooker & Arnott) K. Brandegee Microsisymbrium lasiophyllum var. dasycarpum O. E. Schulz Microsisymbrium lasiophyllum var. dissectum O. E. Schulz Microsisymbrium lasiophyllum var. inalienum (B. L. Robinson) O. E. Schulz Microsisymbrium lasiophyllum var. integrifolium O. E. Schulz Microsisymbrium lasiophyllum var. rigidum (Greene) O. E. Schulz Sisymbrium acuticarpum Rydberg Sisymbrium deflexum Sisymbrium deflexum var. xerophilum E. Fournier Sisymbrium lasiophyllum Sisymbrium reflexum Streptanthus lasiophyllus Streptanthus lasiophyllus var. inalienus (B. L. Robinson) Hoover Streptanthus lasiophyllus var. utahensis (Rydberg) Hoover Streptanthus rigidus Thelypodium lasiophyllum Thelypodium lasiophyllum var. inalienum B. L. Robinson Thelypodium lasiophyllum var. rigidum (Greene) B. L. Robinson Thelypodium lasiophyllum var. utahense (Rydberg) Jepson Thelypodium rigidum Thelypodium utahense
Treatment appears in FNA Volume 7. Treatment on page 683. Mentioned on page 677, 678.

Annuals; (not glaucous), usually sparsely to densely hispid or hirsute, rarely subglabrate. Stems erect, unbranched or branched distally, (0.8–)2–10(–16) dm, at least sparsely hirsute basally. Basal leaves soon withered. Cauline leaves petiolate (proximal and median 0.5–3 cm); blade lanceolate to oblong or oblanceolate, pinnatifid, 2–12 cm × 5–50 mm, (smaller with fewer lobes distally), margins of lateral lobes dentate or entire. Racemes without a terminal cluster of sterile flowers, (considerably elongated in fruit). Fruiting pedicels strongly reflexed or spreading, (slender or thickened), (0.7–)1–2.2(–3) mm. Flowers: sepals erect, oblong, 2–4 × 0.7–1 mm, (not saccate or urceolate); petals usually white to creamy white, rarely pinkish, (narrowly oblanceolate), 2.5–5(–6.5) × 0.9–1.1 mm, not channeled or crisped, claw undifferentiated from blade; filaments slightly tetradynamous, median pairs 3–4.5 mm, lateral pair 1.5–2.5 mm; anthers ovate, equal, 0.4–0.7 mm. Fruits ascending or descending (straight to slightly curved, sometimes subtorulose), terete, 2–4.8(–5.7) cm × 0.7–1.2 mm; valves each with obscure midvein, (glabrous or sparsely pubescent); ovules 14–60 per ovary; style 0.5–2 mm; stigma subentire. Seeds (brown), 0.9–1.5 × 0.6–1 mm. 2n = 28.


Phenology: Flowering Mar–May.
Habitat: Desert flats, gravelly areas, limestone rocks, talus slopes, shrub communities, hillsides, sandy banks, disturbed sites, grassy fields, ravines
Elevation: 0-1400 m

Distribution

V7 1174-distribution-map.gif

Ariz., Calif., Nev., N.Mex., Oreg., Utah, Wash., Mexico (Baja California, Sonora).

Discussion

Caulanthus lasiophyllus is highly variable in flower size, leaf morphology, fruit morphology (length, width, curvature, presence or absence of indumentum) and orientation, number of ovules per ovary, and plant height. This species is badly in need of thorough studies at both populational and molecular levels, and it is very likely that some varieties recognized by E. B. Payson (1923), such as var. rigidus, may well represent distinct species or subspecies.

Selected References

None.

Lower Taxa

None.
... more about "Caulanthus lasiophyllus"
Ihsan A. Al-Shehbaz +
(Hooker & Arnott) Payson +
Turritis lasiophylla +
Ariz. +, Calif. +, Nev. +, N.Mex. +, Oreg. +, Utah +, Wash. +, Mexico (Baja California +  and Sonora). +
0-1400 m +
Desert flats, gravelly areas, limestone rocks, talus slopes, shrub communities, hillsides, sandy banks, disturbed sites, grassy fields, ravines +
Flowering Mar–May. +
Ann. Missouri Bot. Gard. +
Caulanthus lasiophyllus var. inalienus +, Caulanthus lasiophyllus var. rigidus +, Caulanthus lasiophyllus var. utahensis +, Erysimum retrofractum +, Guillenia inaliena +, Guillenia lasiophylla +, Guillenia rigida +, Microsisymbrium lasiophyllum +, Microsisymbrium lasiophyllum var. dasycarpum +, Microsisymbrium lasiophyllum var. dissectum +, Microsisymbrium lasiophyllum var. inalienum +, Microsisymbrium lasiophyllum var. integrifolium +, Microsisymbrium lasiophyllum var. rigidum +, Sisymbrium acuticarpum +, Sisymbrium deflexum +, Sisymbrium deflexum var. xerophilum +, Sisymbrium lasiophyllum +, Sisymbrium reflexum +, Streptanthus lasiophyllus +, Streptanthus lasiophyllus var. inalienus +, Streptanthus lasiophyllus var. utahensis +, Streptanthus rigidus +, Thelypodium lasiophyllum +, Thelypodium lasiophyllum var. inalienum +, Thelypodium lasiophyllum var. rigidum +, Thelypodium lasiophyllum var. utahense +, Thelypodium rigidum +  and Thelypodium utahense +
Caulanthus lasiophyllus +
Caulanthus +
species +