Det from digital image. S. wrightii has a longer panicle, with secondary panicle branches mostly appressed and flowered close to the base, while S. airoides generally has a broader panicle, with divergent branchlets, that are more bare in the lower portion. The image fits S. wrightii much better than S. airoides.
S. & G. Jones
6111
1990-11-01
1990-11-01
United States, Texas, Cameron, Contact UM Herbarium