FNA Sporobolus vaginiflorus Key to Varieties

by Bob Harms 

Peterson et al. 2003 (Flora of North America, Vol. 25) use, among other features, glume/floret length relationship in distinguishing two varieties of S. vaginiflorus:

• Sheath bases sparsely hairy; glumes usually longer than the florets; lemmas always faintly 3-veined ⇒ var. ozarkanus
• Sheath bases usually glabrous; glumes usually shorter than the florets; lemmas usually 1-veined ⇒ var. vaginiflorus