Open Herbarium - Paspalum setaceum

Paspalum setaceum Michx.
Family: Poaceae Linda Ann Vorobik and Cindy Roché, Illustrators	Flora of North America Resources Charles M. Allen and David W. Hall Plants perennial; cespitose or shortly rhizomatous. Culms 25-110 cm, erect, spreading, or prostrate; nodes glabrous or pubescent. Sheaths glabrous or pubescent; ligules 0.2-0.5 mm; blades flat, glabrous or pubescent. Panicles terminal and axillary, with 1-6 racemosely arranged branches, axillary panicles partially or completely enclosed by the subtending leaf sheath; branches 2-12(17) cm, ascending to spreading, often arcuate, terminating in a spikelet; branch axes 0.2-1.2 mm wide, glabrous, sometimes scabrous. Spikelets 1.4-2.6 mm long, paired, imbricate, appressed to the branch axes, elliptic to obovate to ovate to orbicular, stramineous or brown. Lower glumes absent; upper glumes and lower lemmas glabrous or shortly glandular-pubescent, 3-veined, margins entire; lower lemmas lacking ribs over the veins; upper florets stramineous. Caryopses elliptic to suborbicular, white. 2n = 20. Paspalum setaceum is a variable species that grows east of the Rocky Mountains in the contiguous United States and Mexico. The following treatment summarizes the major patterns of variation within the species. Some specimens will be hard to place, particularly old herbarium specimens that have lost their color. Nine varieties grow in the Floraregion.
Open Interactive Map Linda Ann Vorobik and Cindy Roché, Illustrators Click to Display 2 Total Images