Eriogonum marifolium |
Eriogonum marifolium var. marifolium |
|||||
---|---|---|---|---|---|---|
marum-leaf buckwheat, marum-leaf wild buckwheat, mountain buckwheat |
marum-leaf buckwheat, marum-leaf wild buckwheat, mountain buckwheat |
|||||
Habit | Herbs, matted, dioecious, (0.1–)0.5–5 × 2–8 dm, floccose or glabrous. | |||||
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, (0.1–)0.5–4 dm, floccose or glabrous. |
|||||
Leaves | in loose to compact basal rosettes; petiole 0.3–2 cm, often tomentose; blade ovate to oval, 0.3–3 × 0.3–1 cm, densely tannish- to brownish-lanate abaxially, glabrate and green to olive green adaxially, margins entire, plane. |
blades 0.3–1.5 cm. |
||||
Inflorescences | capitate, 0.5–2 cm wide, mature pistillate plants open and elongate-umbellate, 1–5 × 1–7 cm; branches usually glabrous; bracts 5–10, leaflike, 0.2–0.8 cm, often absent immediately below involucre. |
|||||
Involucres | 1 per node but occasionally appearing congested, turbinate and 2–3 × 1.5–2 mm or campanulate and 4–5 × 5–7 mm, sparsely tomentose or glabrous; teeth 5–6, erect, 0.4–0.7 mm. |
turbinate, 2–3 × 1.5–2 mm. |
||||
Flowers | stipelike base 0.5–1 mm; perianth yellow, glabrous; staminate flowers 1.5–3 mm, tepals ovate; pistillate flowers 4–7 mm, tepals oblanceolate, often becoming reddish in fruit; stamens exserted, 2–3 mm; filaments pilose proximally. |
|||||
Achenes | light brown to brown, 3.5–5 mm, glabrous except for sparsely pubescent beak. |
|||||
2n | = 32. |
|||||
Eriogonum marifolium |
Eriogonum marifolium var. marifolium |
|||||
Phenology | Flowering Jun–Aug. | |||||
Habitat | Sandy, volcanic or occasionally granitic flats and slopes, mixed grassland, manzanita, and sagebrush communities, montane conifer woodlands | |||||
Elevation | (900-)1100-3100(-3300) m ((3000-)3600-10200(-10800) ft) | |||||
Distribution |
CA; NV; OR; WA
|
CA; NV; OR; WA |
||||
Discussion | Varieties 2 (2 in the flora). Eriogonum marifolium is dioecious, with the two sexes having such markedly different morphology that collectors often consider each to represent a different species. In Oregon, male plants of E. marifolium and E. umbellatum var. haussknechtii can be difficult to distinguish. In El Dorado and Placer counties, California, herbarium specimens of E. marifolium and E. incanum can be difficult to separate, as their distribution ranges overlap there. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Variety marifolium occurs in widely scattered locations, often on volcanic peaks, in Washington (Yakima County), Oregon (Crook, Deschutes, Douglas, Hood River, Jackson, Jefferson, Klamath, Lane, Linn, and Marion counties), and north-central California (to Shasta County). The variety is more common in the northern Sierra Nevada (Alpine, Amador, Butte, Calveras, El Dorado, Lassen, Mono, Nevada, Place, Plumas, Sierra, and Tuohumne counties) and west-central Nevada (Carson City, Douglas, and Washoe counties). An isolated population is found on the Pine Forest Range of Humboldt County, Nevada (Discussion copyrighted by Flora of North America; reprinted with permission.) |
||||
Key |
|
|||||
Source | FNA vol. 5, p. 365. | FNA vol. 5, p. 366. | ||||
Parent taxa | Polygonaceae > subfam. Eriogonoideae > Eriogonum > subg. Oligogonum | Polygonaceae > subfam. Eriogonoideae > Eriogonum > subg. Oligogonum > Eriogonum marifolium | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | E. cupulatum, E. marifolium var. apertum | E. marifolium var. apertum | ||||
Name authority | Torrey & A. Gray: Proc. Amer. Acad. Arts 8: 161. (1870) | unknown | ||||
Web links |
|