Eriogonum heermannii var. sulcatum

(S. Watson) Munz & Reveal

in P. A. Munz, Suppl. Calif. Fl., 62. 1968.

Common names: Heermann’s grooved wild buckwheat
Endemic
Basionym: Eriogonum sulcatum S. Watson Proc. Amer. Acad. Arts 14: 296. 1879
Synonyms: Eriogonum heermannii subsp. sulcatum (S. Watson) S. Stokes
Treatment appears in FNA Volume 5. Treatment on page 307. Mentioned on page 304, 306.

Subshrubs, spreading, densely branched, (0.5–)1–8 × 2–8 dm. Leaf blades linear-lanceolate to elliptic or spatulate, 0.4–1.2(–1.5) × 0.2–0.8 cm, thinly tomentose abaxially. Inflorescences 1–5(–8) × 3–10 cm; branches diffuse, with dichotomously arranged involucres, slender, sharply ridged and deeply grooved, minutely scabrellous, not spinose. Involucres campanulate, 0.7–1.5(–2) × 0.7–1.5(–2) mm. Flowers 1.5–2.5 mm; perianth yellowish white.


Phenology: Flowering Apr–Oct.
Habitat: Limestone cliffs and outcrops, saltbush, blackbrush, sagebrush, and mountain mahogany communities, scrub oak and pinyon-juniper woodlands
Elevation: 700-2700 m

Distribution

V5 610-distribution-map.gif

Ariz., Calif., Nev., Utah.

Discussion

Variety sulcatum is locally common and occurs typically on limestone outcrops and cliff-faces. It is found in desert ranges of southeastern Inyo and northeastern San Bernardino counties, California, in Clark and southern Lincoln and Nye counties, Nevada, and in Washington County, Utah. In Arizona the plants occur in northern Mohave County and into northwestern Coconino County. The variety would make an ideal addition to the rock garden as a subshrub if one were willing to allow sufficient time for the plants to mature. This slow-growing plant forms dense, dark green clumps of tangled inflorescence branches and is attractive even without flowers.

Selected References

None.

Lower Taxa

None.
James L. Reveal +
(S. Watson) Munz & Reveal +
Eriogonum sulcatum +
Heermann’s grooved wild buckwheat +
Ariz. +, Calif. +, Nev. +  and Utah. +
700-2700 m +
Limestone cliffs and outcrops, saltbush, blackbrush, sagebrush, and mountain mahogany communities, scrub oak and pinyon-juniper woodlands +
Flowering Apr–Oct. +
in P. A. Munz, Suppl. Calif. Fl., +
Eriogonum heermannii subsp. sulcatum +
Eriogonum heermannii var. sulcatum +
Eriogonum heermannii +
variety +