familyPolygonaceae
subfamilyPolygonaceae subfam. Eriogonoideae
genusEriogonum
subgenusEriogonum subg. Oligogonum
speciesEriogonum arcuatum
Eriogonum arcuatum var. xanthum
Harvard Pap. Bot. 9: 157. 2004.
Common names: Ivy League wild buckwheat
Basionym: Eriogonum xanthum Small
Synonyms: Eriogonum chloranthum GreeneEriogonum flavum subsp. chloranthum (Greene) S. StokesEriogonum flavum var. xanthum (Small) S. StokesEriogonum jamesii var. xanthum (Small) Reveal
Revision as of 22:28, 26 July 2019 by FNA>Volume Importer
Plants compact mats, 3–10 dm wide. Aerial flowering stems 0.2–0.8 dm. Leaf blades oblanceolate to oblong, 1–2.5 × 0.5–1 cm. Inflorescences capitate, often reduced to single involucre; bracts 0.3–1 × 0.2–0.7 cm. Involucres 4–6 × 3–5 mm. Flowers 6–7 mm.
Phenology: Flowering Jul–Sep.
Habitat: Sandy, gravelly to rocky or talus slopes, high-elevation grassland, sagebrush, and tundra communities, alpine conifer woodlands
Elevation: (2600-)3000-4000(-4200) m
Discussion
Variety xanthum is the subalpine to alpine expression of the species and is distributed along the backbone of the Colorado Rocky Mountains on many of the highest peaks (Chaffee, Clear Creek, Custer, El Paso, Fremont, Grand, Hinsdale, Huerfano, Lake, Larimer, Park, Saguache, Summit, and Teller counties). The plants are rather exquisite in the field and do well in cultivation.
Selected References
None.
Lower Taxa
None.
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