Eriogonum spergulinum

A. Gray

Proc. Amer. Acad. Arts 7: 389. 1868.

IllustratedEndemic
Synonyms: Oxytheca spergulina (A. Gray) Greene
Treatment appears in FNA Volume 5. Treatment on page 409. Mentioned on page 382, 435.

Herbs, prostrate to spreading or erect, annual, 0.5–4 dm, glabrous or glandular and short-hispid, greenish, grayish, or reddish. Stems: caudex absent; aerial flowering stems prostrate to erect, solid, not fistulose, 0.1–0.5 dm, glabrous or glandular and short-hispid. Leaves basal and cauline; basal: petiole 0.05–0.3 cm, hispid, blade linear, (0.3–)1–3(–4) × 0.05–0.3 cm, short-hispid, margins plane or revolute, ciliate; cauline sessile, blade linear, 0.3–2.5 × 0.05–0.3 cm, similar to basal blade. Inflorescences cymose, open to diffuse, 4–25 × 5–35 cm; branches sparsely hispid to puberulent, internodes usually glandular; bracts 3–6, semileaflike, 2–10 × 0.5–2 mm. Peduncles erect, straight, filiform, 0.4–1.5 cm, glabrous. Involucres turbinate, 0.5–1 × 0.4–0.8 mm, glabrous; teeth 4, erect, 0.2–0.4 mm. Flowers 1.5–3.5 mm; perianth white with greenish to reddish midribs, becoming pinkish to rose, glabrous or sparsely pubescent; tepals monomorphic, oblong; stamens included, 0.5–2 mm; filaments usually glabrous. Achenes brown to blackish, lenticular, 1.5–2.3 mm, glabrous.

Discussion

Varieties 3 (3 in the flora).

Selected References

None.

Key

1 Branch internodes not glandular; plants prostrate to ascending; s Sierra Nevada, California Eriogonum spergulinum var. pratense
1 Branch internodes glandular; plants erect > 2
2 Flowers 1.5-2.5 mm; Transverse, Sierra Nevada, and North Coast Ranges of nw, sw, and e California and w Nevada, also s Oregon, c Idaho Eriogonum spergulinum var. reddingianum
2 Flowers 2.5-3.5 mm; c Sierra Nevada, California Eriogonum spergulinum var. spergulinum