Elymus trachycaulus subsp. subsecundus (Link) Á. Love & D. Love (redirected from: Agropyron trachycaulum var. unilaterale)
Family: Poaceae
Slender Wheatgrass
[Agropyron caninoides var. pubescens Scribn. & J.G. Sm.,  more]
Elymus trachycaulus subsp. subsecundus image

Culms 40-110 cm. Spikes 7-25 cm, somewhat 1-sided. Spikelets with 3-7 florets, the bases usually visible. Glumes 11-17 mm, long-acuminate or awned, awns to 11 mm; lemmas awned, awns 17-40 mm, longer than the lemma body, straight.

Elymus trachycaulus subsp. subsecundus grows primarily in the Great Plains. It may be confused with solitary-spikeleted plants of E. glaucus , from which it differs in its 1-sided spike and its stiffer, more basally concentrated leaves. Jozwik (1966) suggested that it is composed of derivatives from E. trachycaulus subsp. trachycaulus -- Hordeum jubatum -hybrids that are adapted to moist prairies. He noted that the unilateral spike is particularly characteristic of artificial hybrids between the two species, and is uncommon in other hybrids.

From Flora of Indiana (1940) by Charles C. Deam
This species is local in a few of our northern counties, where it is found in dry, sandy or clayey soil on the crests of low dunes, on wooded banks about lakes, and in springy places and marshes.