Vulpia bromoides and V. myuros, comparison of glumes

V. myuros: Lower glumes less than 1/2 the length of the upper glumes (lower glumes 0.5-2 mm, 1/5-1/2 the length of the upper glumes; upper glumes 2.5-5.5 mm). Illustration of spikelet from Manual of the Grasses of the United States, 2 ed. PDF: http://standish.stanford.edu/bin/object?00003911

N.B. Both var. myurus and var hirsuta (Festuca megalura) are present.

V. bromoides: Lower glumes 1/2 or more the length of the upper glumes (Lower glumes 3.5-5 mm, 1/2-4/5 the length of the upper glumes; upper glumes 4.5-9.5 mm).

 —Manual of Grasses of North America http://herbarium.usu.edu/grassmanual/

Also see comments for V. microstachys