Muhlenbergia tenuissima (J. Presl) Kunth

Muhlenbergia tenuissima (Presl) Kunth, Rev. Gram Suppl. xvi. 1830.
Podosaemum tenuissimum Presl, Rel. Haenk. 1: 230. 1830.
Muhlenbergia nebulosa Scribn.; Beal, Grasses N. Am. 2: 247. 1896. (Type from Guadalajara, Mexico, Pringlc 2366.)
Annual; culms slender, branching at all the nodes, spreading, angled, glabrous or finely scaberulous especially below the nodes, 5-25 cm. tall; sheaths scaberulous, shorter than the internodes; ligule thin, 1-1.5 mm. long; blades flat or loosely involute, glabrous beneath, pubescent on the upper surface, mostly not more than 3 cm. long, 0.5 mm. wide; panicles numerous, terminal and axillary, rather narrow, open, 2-4 cm. long, the branches ascending or spreading, usually less than I cm. long, the pedicels slender, longer than the spikelets; glumes somewhat unequal, acute or mucronate, the second 0.5-1 mm. long; lemma lanceolate, 3-nervcd, sparsely pilose along the contiguous margins about 1.5 mm. long; awn slender, scabrous, nearly straight, 3-5 mm. long.
TvpB locality: Panama and Mexico (Ilacnke).
I)IsTKIBr:TK)N: Open wet soil. Jalisco. Colima, and Nayaril (Pringle 2366, II7!>3, Orcutt 1629, Palmer 1933 in 1892); al.so Panama (Presl).