Burke: Eriogonum angulosum vs. Eriogonum umbellatum

	Eriogonum angulosum	Eriogonum umbellatum
		sulfur buckwheat, sulfurflower
Habit		A variable, freely-branching perennial, usually forming low mats up to 6 dm. broad, but occasionally the branches ascending to 3 dm.
Leaves		Variable, oblong to broadly obovate, acute or rounded, gradually or abruptly narrowed to a slender petiole, the blade 1-3 cm. long and the petiole 1/3 to equal length, usually gray-wooly on the under surface and green on the top.
Flowers		Flowering stems up to 30 cm. longer but usually much shorter, leafless or with 1 or more small, scattered bracts; inflorescence a simple or compound, open umbel, the rays subtended by whorls of narrow bracts; involucre narrowly cup-shaped, the lobes 2-3 mm. long, about equal to the tube, usually reflexed; tepals glabrous, usually cream to yellow with a stipitate base, the lobes 2.5-4 mm. long, lengthening to up to 7 mm. in fruit.

	Eriogonum angulosum	Eriogonum umbellatum
Identification notes		The large mat of green leaves which are gray on the under surface, and the yellow or cream flowers will usually identify this species.
Flowering time		June-September
Habitat		Sagebrush deserts to alpine rocky ridges.
Distribution	[WildflowerSearch map] [BONAP county map]	On both sides of the Cascades in Washington; British Columbia south to California, east to Montana, Colorado and New Mexico. [WildflowerSearch map] [BONAP county map]
Origin		Native
Conservation status		Not of concern
Sibling taxa	E. baileyi, E. cernuum, E. codium, E. compositum, E. douglasii, E. elatum, E. flavum, E. heracleoides, E. maculatum, E. marifolium, E. microtheca, E. niveum, E. nudum, E. ovalifolium, E. pyrolifolium, E. sphaerocephalum, E. strictum, E. thymoides, E. umbellatum, E. vimineum	E. baileyi, E. cernuum, E. codium, E. compositum, E. douglasii, E. elatum, E. flavum, E. heracleoides, E. maculatum, E. marifolium, E. microtheca, E. niveum, E. nudum, E. ovalifolium, E. pyrolifolium, E. sphaerocephalum, E. strictum, E. thymoides, E. vimineum
Subordinate taxa		E. umbellatum var. devestivum, E. umbellatum var. ellipticum, E. umbellatum var. haussknechtii, E. umbellatum var. hypoleium, E. umbellatum var. majus, E. umbellatum var. sandbergii
Web links	Local floras: CA, OR Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Eriogonum angulosum

Eriogonum umbellatum

sulfur buckwheat, sulfurflower

Habit

A variable, freely-branching perennial, usually forming low mats up to 6 dm. broad, but occasionally the branches ascending to 3 dm.

Leaves

Variable, oblong to broadly obovate, acute or rounded, gradually or abruptly narrowed to a slender petiole, the blade 1-3 cm. long and the petiole 1/3 to equal length, usually gray-wooly on the under surface and green on the top.

Flowers

Flowering stems up to 30 cm. longer but usually much shorter, leafless or with 1 or more small, scattered bracts; inflorescence a simple or compound, open umbel, the rays subtended by whorls of narrow bracts;

involucre narrowly cup-shaped, the lobes 2-3 mm. long, about equal to the tube, usually reflexed;

tepals glabrous, usually cream to yellow with a stipitate base, the lobes 2.5-4 mm. long, lengthening to up to 7 mm. in fruit.