Part 2, 1912] POACEAE 139 
midnerve extending into a hispidulous terete awn as long as or longer than the scale, the 
lateral lobes with usually a minute tooth at the base of the awn. 
TYPE LOCALITY: Cumana, Venezuela. 
DISTRIBUTION : California, Mexico, and Guatemala ; also i in South America. 
ILLUSTRATIONS: Bull. U. S. Dep. Agr. Agrost, 20: rac 15; H.B.K. Nov. Gen. & Sp. pl. 42,43; 
Bull. U. S. Dep. Agr. Bot. 121: 1. 12; Beal, Grasses N. ‘Am. 2: J. I7. 
3. Aegopogon breviglumis (Scribn.) Nash, sp. nov. 
Aegopogon geminifiorus breviglumis Scribn. Zoe 4: 386. 1894. 
Stems 1-5 dm. tall, very slender; leaf-sheaths smooth and glabrous; blades usually 1-5 
em. long, rarely 1 dm., up to 1.5 mm. wide, glabrous, or sometimes puberulent on the 
upper surface; inflorescence 2-8 cm. long, sometimes interrupted below; spikelet-clusters 
2.5-3 mm. long, exclusive of the awns and peduncle, of 2 or 3 spikelets, one spikelet sessile or 
short-pedicellate, perfect, the other 1 or 2 with longer pedicels, staminate or empty, sometimes 
rudimentary; empty scales short, I-nerved, the nerve running out into an awn 3 times as long 
as the scale or more, 2-toothed or 2-lobed at the apex, the teeth or lobes acute, the scales 
sometimes reduced to an awn only; flowering scale of the perfect spikelet 3-lobed at the apex, 
3-nerved and 3-awned, the midnerve running out into a2 long awn usually 3-4 times as long 
as the scale, the lateral nerves very acute, awned, the awn several times as long as the lobe 
with usually an acute tooth at the base, the flowering scale of the other spikelets similar or 
sometimes reduced to awns. 
TYPE LOCALITY : Saucito, Lower California. 
DISTRIBUTION ; Lower California, Jalisco, and Colima. 
4. Aegopogon unisetus (Lag.) R. & S. Syst. Veg. 2: 805. 1817. 
Hymenothecium untsetum Lag. Gen. Sp. Pl. 4. 1816. 
Schellingia tenera Steud. Flora 33: 232. 1850. 
Aegopogon geminiflorus Fourn. Mex. Pl. Gram. 71. 1881. Not A. gemintflorus H.B.K. 1815. 
Aegopogon geminifiorus purpureus Griseb.; Fourn. Mex. Pl. Gram. 71. 1881. 
Aegopagon geminifiorus unisetus Fourn. Mex. Pl. Gram. 71. 1881. 
Aegopogon geminifiorus aboriivus Fourn. Mex. Pl. Gram. 71. 1881. 
Stems up to 5 dm. long, slender; leaf-sheaths smooth and glabrous; blades usually 1-6 
em. long, rarely 1 dm., 1-3 mm. wide, glabrous *beneath, commonly puberulent on the 
upper surface or rarely glabrous and scabrous; inflorescence 2~—6 cm. long, often interrupted 
below; spikelet-clusters 3-4 mm. long, exclusive of the awns and the hispid peduncle, of 3 
spikelets on hispid pedicels, the sessile or short-pedicellate spikelet perfect, the others empty; 
empty scales obovate, obovate-cuneate, or cuneate, 2-lobed at the apex with rounded 
or truncate lobes, 1-nerved, rarely awnless, the nerve usually extending as a his- 
pidulous awn shorter than the scale, or rarely equaling it; flowering scale of the perfect 
spikelet 3-nerved, 3-lobed and 3-awned at the apex, the midnerve running out into a his- 
pidulous awn usually longer than the spikelet, rarely shorter, the lateral lobes subulate and 
extending into short awns, and sometimes with a minute tooth at the base of the awn, the 
lobes rarely obtuse and merely awn-pointed, the flowering scale of the other spikelets with 
the lobes rounded and muticous, rarely awn-pointed, or the lobes rarely resembling those of 
the perfect spikelet. 
TYPE LOCALITY: Mexico. 
DISTRIBUTION: Arizona to Guatemala. 
ILLUSTRATION: Flora 33: f/. 1. 
34. NAZIA Adans. Fam. PI. 2: 31, 581. 1763. 
Tragus Hall. Hist. Stirp. Helv. 2: 203. 1768. 
Lappago Schreb. Gen. Pl. 55, 1789. 
Annual grasses, with flat leaf-blades, and a spike-like inflorescence. Spikelets articulated 
below the empty scales, 1-flowered, usually in clusters of 2-5, rarely single, the terminal spikelet 
of each cluster often sterile or reduced in size. Scales 2 or 3; first scale small, thin, almost 
hyaline, or sometimes wanting; second scale firm, with the nerves dorsally armed with hooked 
spines which are swollen and opaque at the base, more slender and translucent above; third 
