Eriogonum arcuatum (Eriogonum arcuatum)
Description
Eriogonum flavum is a species of wild buckwheat. It is a perennial herb from taproot and woody caudex that forms dense mats in small areas, with leafless stems approximately 5-20 cm high. The 2.5-7 cm long leaves are spatulate-oblanceolate with long petioles. The plant is greenish above, while heavily whitish-tomentose below. This perennial herb re-emerges from taproot and woody caudex, and is likely long lived.Flowers late May to mid July. The inflorescence is a dense umbel with leaf like bracts at its base. There is one heavily villous involcure, roughly 5-6 mm high per ray of the umbel. The perianth is 4-6 mm long, very hairy, and typically pale yellow. Roughly half of the viable population produce flowers in a given season, and seed are uncommon, further supporting longevity. Downhill transport of seeds is primary way of dispersal, but wind probably aids in dispersal uphill. However, downhill growth of caudex branches aids in vegetative dispersal. Fruit are 3-5 mm long three angled achenes that are sparsely pubescent at tip."Inflorescences subcapitate or umbellate, 0.5-3(-5) - 0.3-2.5(-3) dm; branches tomentose to floccose; bracts 4-6, leaflike to semileaflike at proximal node, 0.5-2 - 0.2-0.5 cm, sometimes absent immediately below involucre. Involucres 1 per node, turbinate to campanulate, 3-9 - 2-5 mm, tomentose to floccose; teeth 5-8, erect, 0.2-1 mm. Flowers 3-7 mm, including 0.2-1.5 mm stipelike base; perianth pale to bright yellow, densely pubescent abaxially; tepals monomorphic, oblong; stamens exserted, 3-6 mm; filaments pilose proximally. Achenes light brown to brown, 3-5 mm, glabrous except for sparsely pubescent beak."
Taxonomic tree
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Domain: Eukarya
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Kingdom: Plantae
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Phylum:
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Class: Magnoliopsida
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Order: Caryophyllales
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Family: Polygonaceae
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Genus: Eriogonum
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