No...27. 
PAPPOPHORUM APERTUM Munro, in Herb. 
Plant perennial, loosely tufted with somewhat bulbous base. 
Culms erect, not branched, solid, terete, smooth, 18 to 30 inches tall. 
eaves; radical few and small; from radical shoots, with slightly wae: 
sheaths, and narrow, involute blades, 4 to 10 inches long; of culm 3 or 4; sheat 
nearly equaling or often exceeding internodes, slightly hispid; blade involute, his. 
pid above, 2 lines wide with long tapering point, 6 to 10 inches long; ligule a rather 
conspicuous, loose hairy fringe 14 to 2 lines long. 
Inflorescence a close, linear, spike-like, panicle, 6 to 10 inches long, with short 
branches below, none above, often included at base 
kelets oblong, 3-flowered (upper one sterile), 2 lines long, on short hispid 
pedicels less than } line long; first glume lanceolate acute, carinate, hyaline, mi- 
nutely hispid on keel, 1-nerved, 1} lines long; second glume same but $ line longer; 
oral glumes vasiform, nearly square unrolled, pubescent especially below, 1 line 
nia 7-nerved, each nerve terminating in a hispid awn 2 lines long, and alternat- 
g with these are 7 or 8 slightly smaller awns; sterile glume similar but half as 
a and raised on an internode of the sabbalia: 4 line long; palet lanceolate, lacer- 
ate at apex, 2-keeled, 14 lines long. 
rain narrowly lanceolate, light brown, 1 line long, falling with the entire 
spikelet, except the persistent empty glumes. 
PLATE XXVII; a, spikelet; b, empty Eon ie e, floral glume; d, palet; e, ster- 
ile upper flower 
There is a variety of this species with much looser inflorescence, the lower 
branches 1 to 2 inches long, flowering mostly to the base and subdivided; spikelets 
purplish. 
Western Texas to Arizona, 
