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semicostatus, Elymus sibiricus, Elymus sierrae, Elymus stebbinsii, Elymus svensonii, Elymus texensis, Elymus trachycaulus, Elymus tsukushiensis, Elymus villosus

currently has its eastern limit 50-100 miles west of most E. svensonii. Elymus svensonii hybridizes naturally with E. hystrix, E. virginicus (p. 298) and

Fernald Bidens hyperborea var. gaspensis Fernald Bidens hyperborea var. svensonii Fassett Treatment appears in FNA Volume 21. Treatment on page 216. Mentioned

(Steyermark 1963; Smith 1991). It is similar to the more eastern, disjunct E. svensonii (see previous), from which it differs in its more open spikes, longer awns

canadensis or, at the other extreme, used to include E. churchii, E. svensonii (p. 314), and E. diversiglumis (p. 316), three species that seem more closely

Wisconsin, and Iowa. Elymus diversiglumis is a variable species that, like E. svensonii (p. 314) and E. churchii (p. 314), may have originated from hybrids between

segregating generations. Within the ranges of E. diversiglumis (p. 316), E. svensonii (p. 314), and E. churchii (p. 314;, there appear to be frequent introgressants