Eriogonum tumulosum

(Barneby) Reveal

Phytologia 23: 173. 1972.

Common names: Woodside wild buckwheat
Endemic
Basionym: Eriogonum villiflorum var. tumulosum Barneby Leafl. W. Bot. 5: 153. 1949
Treatment appears in FNA Volume 5. Treatment on page 285. Mentioned on page 232, 240.

Herbs, matted, scapose, 0.01–0.1 × 1–4 dm, villous to silky-tomentose, greenish. Stems matted, with persistent leaf bases, up to 1/5 height of plant; caudex stems matted; aerial flowering stems scapelike, erect, slender, solid, not fistulose, 0.01–0.1 dm, villous to silky-tomentose. Leaves basal, fasciculate in terminal tufts, or cauline, 1 per node, sheathing nearly entire length of stem; petiole 0.04–0.07 cm, silky-tomentose; blade oblanceolate to elliptic, 0.3–0.4 × 0.07–0.1 cm, margins plane or slightly thickened. Inflorescences capitate, 0.5–0.8(–1) cm; branches absent; bracts 4–5, semileaflike, linear-lanceolate to lanceolate, 2.5–3.5 × 0.3–0.4 mm. Peduncles absent. Involucres 1 per node, campanulate, 2–4 × (4–)5–8 mm, rigid, tomentose; teeth 7–10, spreading, 1.6–2.2 mm. Flowers 3–4 mm; perianth white to rose, pilose; tepals connate proximal 1/4, monomorphic, oblong; stamens exserted, 3–4 mm; filaments glabrous. Achenes light brown, 2–2.5 mm, glabrous.


Phenology: Flowering May–Jul.
Habitat: Gravelly to clayey flats and slopes, saltbush and sagebrush communities, pinyon and/or juniper woodlands
Elevation: 1500-2300 m

Discussion

Eriogonum tumulosum is infrequent in Duchesne, Emery, eastern Sevier, and Uintah counties, Utah, and in western Moffat County, Colorado. It is often confused with Parthenium ligulatum (M. E. Jones) Barneby (Asteraceae); they grow together and both form dense hummock-like mats. Woodside wild buckwheat is seen infrequently in rock gardens.

Selected References

None.

Lower Taxa

None.
... more about "Eriogonum tumulosum"
James L. Reveal +
(Barneby) Reveal +
Eriogonum villiflorum var. tumulosum +
Woodside wild buckwheat +
Colo. +  and Utah. +
1500-2300 m +
Gravelly to clayey flats and slopes, saltbush and sagebrush communities, pinyon and/or juniper woodlands +
Flowering May–Jul. +
Eriogonum tumulosum +
Eriogonum subg. Eucycla +
species +