Eriogonum wrightii var. trachygonum

(Torrey ex Bentham) Jepson

Fl. W. Calif., 154. 1901.

Common names: Rough-node bastard-sage
Basionym: Eriogonum trachygonum Torrey ex Bentham in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 14: 15. 1856
Synonyms: Eriogonum wrightii subsp. trachygonum (Torrey ex Bentham) S. Stokes
Treatment appears in FNA Volume 5. Treatment on page 290. Mentioned on page 291.
Revision as of 20:09, 24 September 2019 by FNA>Volume Importer

Subshrubs, 1.5–4 × 1–5 dm, mostly densely tomentose. Leaf blades elliptic, 1.5–3 × 0.5–1 cm, margins usually plane. Inflorescences virgate or cymose; branches stout. Involucres 3–4 mm. Flowers 3–4 mm; perianth white to pink or rose. Achenes 2.5–3 mm.


Phenology: Flowering Jul–Oct.
Habitat: Gravelly to rocky flats and slopes, mixed grassland and chaparral communities, oak and conifer woodlands
Elevation: 40-800 m

Discussion

Variety trachygonum is the common expression of the species in the Coast Ranges of California (Alameda, Butte, Lake, Merced, Monterey, San Benito, Santa Clara, Shasta, Solano, Stanislaus, Tehama, and Yolo counties). It is found also in scattered locations along the foothills of the Sierra Nevada (mainly Kern, Merced, Nevada, Stanislaus, and Tuolumne counties). The distinction between var. trachygonum and var. subscaposum is imprecise. The difficulty arises in the foothills of the Sierra Nevada, where var. trachygonum is reduced in stature and resembles the larger, mid-elevation expressions of var. subscaposum. The problem is less pronounced in the Coast Ranges, but there one is uncertain whether the high-elevation plants are small forms of var. trachygonum or disjunct populations of var. subscaposum.

Selected References

None.

Lower Taxa

None.
James L. Reveal +
(Torrey ex Bentham) Jepson +
Eriogonum trachygonum +
Rough-node bastard-sage +
40-800 m +
Gravelly to rocky flats and slopes, mixed grassland and chaparral communities, oak and conifer woodlands +
Flowering Jul–Oct. +
Fl. W. Calif., +
Illustrated +
Eriogonum wrightii subsp. trachygonum +
Eriogonum wrightii var. trachygonum +
Eriogonum wrightii +
variety +