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FNA | Family List | FNA Vol. 5 | Polygonaceae | Eriogonum

208. Eriogonum luteolum Greene, Pittonia. 3: 200. 1897.

Eriogonum vimineum Douglas ex Bentham var. luteolum (Greene) S. Stokes

Herbs, erect or prostrate to spreading, 0.5-6 dm, glabrous or occasionally tomentose, greenish to reddish. Stems: aerial flowering stems prostrate to erect, 0.2-2 dm, glabrous or occasionally tomen-tose. Leaves basal or basal and cauline; basal: petiole 1-8 cm, floccose, blade oblong-ovate, reniform, or rounded to cordate, 0.5-5 × 0.5-3.5 cm, densely white-tomentose abaxially, floccose or glabrous and reddish or greenish adaxially; cauline: petiole 0.5-3 cm, floccose, blade cordate to reniform or orbiculate, 0.5-3 × 0.5-3 cm, similar to basal blade. Inflorescences cymose, occasionally distally uniparous due to suppression of secondary branches, open, 2-50 × 3-40 cm; branches glabrous or occasionally tomentose; bracts 1-3(-4) × 1-2 mm. Peduncles absent or erect, straight, slender, 0.1-0.5 cm, glabrous. Involucres terminal at tips of slender branchlets proximally or appressed to branches, cylindric or occasionally turbinate, 2-4 × 1.5-2.5 mm, glabrous or rarely floccose; teeth 5, erect, 0.3-0.5 mm. Flowers 1-2.5 mm; perianth white to rose or yellow, glabrous; tepals monomorphic, obovate; stamens included, 1-1.5 mm; filaments glabrous. Achenes light brown, 3-gonous, 1-2 mm.

Varieties 4 (4 in the flora): w North America.

1 Plants prostrate to spreading, 0.5-3 dm; involucres 3-4 mm, often terminal on elongated branchlets; leaves basal and cauline; serpentine soil; w Alameda and s Marin counties, California   208d var. caninum
+ Plants erect, 2-6 dm; involucres 2-3.5 mm, appressed to inflorescence branches; leaves basal, sometimes also cauline; serpentine or granitic soils; San Mateo, Santa Clara, and Mariposa counties, California, n to sw and sc Oregon   (2)
2 (1) Involucres 2-3 mm; flowers 2-2.5 mm; granitic soils; Sierra Nevada, Alpine and Tuolumne counties, California   208c var. saltuarium
+ Involucres 3-3.5 mm; flowers 1-2 mm; serpentine soils; Coast Ranges and lower foothills of Sierra Nevada, San Mateo, Santa Clara, and Mariposa counties, California, n to sw and sc Oregon   (3)
3 (2) Flowers 1.8-2 mm; Coast Ranges, w California from San Mateo and Santa Clara counties n to sw and sc Oregon   208a var. luteolum
+ Flowers 1-1.5(-1.8) mm; e California from Mariposa County to Plumas County   208b var. pedunculatum


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