Eriogonum ursinum |
Eriogonum ursinum var. erubescens |
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bear buckwheat, Bear Valley buckwheat, Bear Valley wild buckwheat |
blushing wild buckwheat |
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Habit | Herbs, spreading, matted, synoecious, 0.5–4 × (1.5–)2–8(–12), thinly tomen-tose to floccose or glabrate. | Plants 1.5–2.5 × (1.5–)2–8(–12) dm. | ||||
Stems | caudex spreading; aerial flowering stems erect, slender, solid, not fistulose, arising at nodes of caudex branches and at distal nodes of short, non-flowering aerial branches, 0.4–4 dm, thinly tomentose to floccose or glabrate. |
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Aerial flowering stems | 0.4–2 dm, thinly tomentose to floccose. |
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Leaves | in rather compact basal rosettes; petiole 0.1–1.5 cm, tomentose; blade elliptic, 0.7–2(–2.2) × 0.4–1(–1.2) cm, or ovate, 0.8–1.4(–2.5) × 0.5–1.2(–2) cm, densely white- or rufous-tomentose abaxially, thinly tomentose, sparsely floccose, or glabrous and greenish adaxially, margins slightly wavy. |
petiole 0.5–1.5 cm; blade elliptic, 0.7–2(–2.2) × 0.4–1(–1.2) cm, densely white-tomentose abaxially, sparsely floccose or glabrous and green adaxially. |
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Inflorescences | compound-umbellate, 1–3(–6) × 1–5 cm, thinly tomentose to glabrate; bracts: proximal 3–8, lanceolate to narrowly elliptic, 0.5–2 × 0.25–1 cm, distal 3, semileaflike, midway along branch, linear to narrowly lanceolate, 0.7–1 × 0.1–0.25 cm, or ± scalelike below involucre, 1–5 mm. |
thinly tomentose; proximal bracts 4–6, lanceolate to narrowly elliptic, 1–2 × 0.25–0.6 cm, distal bracts semileaflike, midway along branch, linear to narrowly lanceolate, 0.7–1 × 0.1–0.25 cm. |
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Involucres | 1 per node, turbinate to turbinate-campanulate, 3.5–8 × 2.5–4 mm, villous; teeth 5–8, erect, 0.5–2 mm. |
turbinate to turbinate-campanulate, 5–8 × 3–4 mm. |
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Flowers | 5–7 mm at anthesis, 6.5–9 mm in fruit, including 0.5–0.8 mm stipelike base, with perianth cream or rarely yellow, suffused with blush of pinkish red to maroon, glabrous, or flowers 4–6 mm, including 1–1.3 mm stipelike base, with perianth pale yellow or rarely yellow, not suffused with blush of color glabrous; tepals slightly dimorphic or monomorphic, broadly ovate or obovate; stamens exserted, 3–5 mm; filaments pilose proximally. |
5–7 mm at anthesis, 6.5–9 mm in fruit; perianth cream, rarely yellow, becoming suffused with blush of pinkish red to maroon. |
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Achenes | light brown, (5–)5.5–8 mm or 3–3.5 mm, glabrous except for sparsely pubescent beak. |
(5–)5.5–8 mm. |
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Eriogonum ursinum |
Eriogonum ursinum var. erubescens |
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Phenology | Flowering Jun–Sep. | |||||
Habitat | Gravelly metavolcanic soils in montane chaparral, conifer and mountain mahogany communities | |||||
Elevation | 1600-1900 m (5200-6200 ft) | |||||
Distribution |
CA
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CA |
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Discussion | Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Variety erubescens is localized and rare, known only from the eastern Scott Bar Mountains west of Yreka in Siskiyou County, and Trinity Mountain, Trinity County. Technically, the three bracts along the “branchlet” terminate a branch, and a peduncle extends from the whorl of bracts to the base of the involucre. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 5, p. 358. | FNA vol. 5, p. 358. | ||||
Parent taxa | Polygonaceae > subfam. Eriogonoideae > Eriogonum > subg. Oligogonum | Polygonaceae > subfam. Eriogonoideae > Eriogonum > subg. Oligogonum > Eriogonum ursinum | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Name authority | S. Watson: Proc. Amer. Acad. Arts 10: 347. (1875) | Reveal & J. Knorr: Phytologia 86: 161. (2004) | ||||
Web links |