Plants perennial; shortly rhizomatous or with long stolons. Culms
10-40 cm, erect to ascending, solitary or in small clumps; nodes retrorsely
villous; internodes glabrous. Sheaths glabrous or with papillose-based
hairs; ligules 0.5-1.5 mm; blades 1-7(9) cm long, 2-5 mm wide,
glabrous or pilose on both surfaces, margins ciliate basally, with papillose-based
hairs. Panicles 3-6 cm long, 0.5-1 cm wide, with 2-6 spikelike primary
branches in 2 ranks; rachises scabridulous; primary branches 0.5-2
cm, appressed, axes 0.3-0.4 mm wide, triquetrous, scabridulous, glabrous or
puberulent; secondary branches rarely present; pedicels shorter
than the spikelets, scabridulous. Spikelets 3-4.5 mm long, 1.5-2 mm wide,
plano-convex, solitary, in 2 rows, appressed to the branch axes. Glumes
scarcely separate, rachilla between the glumes not pronounced; lower glumes
2.8-3.2 mm, 5-7-veined, glabrous or with long hairs basally; upper glumes
3-4.5 mm, (9)11-13-veined, without cross venation, mostly puberulent, margins
pilose-fringed; lower florets staminate; lower lemmas 3-4.5 mm,
7-9-veined, without cross venation, mostly puberulent, margins pilose-fringed;
lower paleas present; upper lemmas 2.4-2.8 mm long, 1.3-1.4 mm
wide, plano-convex, apices broadly acute to rounded, mucronate; anthers
about 1 mm. Caryopses 1.8-3 mm. 2n = 36.
Urochloa ciliatissima is endemic to Texas, Oklahoma, and Arkansas, and
grows on sandy soils. Reports of its occurrence in Mexico are based on misidentifications
(Morrone and Zuloaga 1993).
