Washington Flora Checklist
A Checklist of the Vascular Plants of Washington State
Hosted by the University of Washington Herbarium

 

Checklist » Polygonaceae » Eriogonum umbellatum var. majus

Eriogonum umbellatum Torr. var. majus Hook. [FNA5, H&C]
Polygonaceae
subalpine sulfur flower

Origin: Native

Voucher: WTU (view specimen records)

Notes: FNA5: "Variety majus is widespread and common in the Rocky Mountains. These plants are often locally common in Idaho and northern Utah, but they are rather rare in the Cascade Range of Washington. The high-elevation plants in Washington are often markedly different from similarly situated Rocky Mountain plants, having smaller leaves and flowers, and tighter, more compact, umbellate inflorescences.

Variety majus is distinct from and often grows with var. umbellatum in Colorado, leading many local taxonomists to distinguish the two at species rank. In Wyoming and Montana, however, var. majus occasionally is difficult to differentiate from var. dichrocephalum. Variety majus often occurs with Eriogonum heracleoides, and mixed collections occasionally are encountered. Care must be taken in the herbarium to differentiate the narrow-leaved E. heracleoides var. leucophaeum from the broader-leaved E. umbellatum var. majus, although the two do not grow together."

Literature:
(none)

Photo © Ben Legler
(from WTU Image Collection)

Taxon treatment authored by Thayne Tuason; last updated 3/20/2009 by David Giblin
Synonyms
Eriogonum subalpinum Greene
Eriogonum umbellatum Torr. ssp. majus (Hooker) Piper
Eriogonum umbellatum Torr. ssp. subalpinum (Greene) S. Stokes




© 2010 University of Washington Herbarium,
Burke Museum of Natural History and Culture.
All Rights Reserved.
Box 355325, University of Washington,
Seattle, WA 98195-5325.