134 POACEAE 
4. Chloris brevispica Nash. Stems 1-2 dm. tall : leaf-blades 1-6 cm. long, 1-3 mm. 
wide, rough above and on the margins: spikes 6-10, finally spreading, 2.5—4.5 cm. long: 
spikelets, exclusive of the awns, about 2.8 mm. long : scales 4; outer empty ones lanceo- 
late, acute ; third scale 2.5 mm. long, in side view elliptic and about 0.75 mm. wide, the 
nerves pilose, the hairs about 0.5 mm. long, the awn about 2 mm. long ; fourth scale 
obovate-cuneate, about 1.5 mm. long, in side view about 0.6 mm. wide, the apex unequally 
rounded, the awn 1.4-1.8 mm. long. 
Insandy soil, Texas. Summer. 
5. Chloris latisquàmea Nash. Stems 2-6 dm. tall: leaf-blades 1-10 em. long, 2-4 
mm. wide, obtuse, rough : axis of the inflorescence 1.5 cm. long or less : spikes 10-16, 3-7 
em. long, finally widely spreading: spikelets, exclusive of the awns, 2.8-2.8 mm. long: 
scales 4; outer empty ones acute; third scale 2.2-2.7 mm. long, in side view elliptic and 
0.8-0.9 mm. wide, the nerves pilose, the awn 1.5-3 mm. long; fourth scale 1.5-1.7 mm. 
long, in side view obcuneate or triangular and 1-1.2 mm. broad, 3-nerved, the lateral 
nerves much curved, branching at the middle, thus making the scale appear 5-nerved at 
the truncate apex, 0.5 mm. wide, the awn 1.5-2 mm. long. 
In dry ground and on shady river banks, Texas. Summer. 
6. Chloris cucullàta Bisch. Stems 2-7 dm. tall: leaf-blades 2-15 cm. long, 3 mm. 
wide or less, very rough : spikes 6-15, 2-4 cm. long, spreading : spikelets, exclusive of the 
awns, about 2 mm. long, triangular, about as broad as long : scales 4 ; first scale acute, the 
second broader above the middle; third scale 1.7-2 mm. long, in side view elliptic and 
about 0.9 mm. wide, obtuse, the lateral nerves densely pilose with short hairs about 0.4 
mm. long, the midnerve sparingly so, the awn 0.5-1 mm. long ; fourth scale about 1 mm. 
long, in side view broadly triangular and 1.3 mm. broad, the lateral nerves branching 
twice, making the scale appear 7-nerved above, the awn 0.2-0.3 mm. long. 
Insandy soil, Texas. Fall. 
7. Chloris Texàna (Vasey) Nash. Stems 2.5-6 dm. tall: leaf-blades 6-20 cm. long, 
3-6 mm. wide, rough on the margins and toward the apex on the lower surface: spikes 
3-6, 4-8 cm. long: spikelets, exclusive of the awns, about 2.8 mm. long: scales 6 ; outer 
empty ones very acute, pointed ; third scale about 2.7 mm. long, in side view inequilateral 
and 1 mm. broad, the nerves pilose with hairs about 1 mm. long, the awn about 1.5 mm. 
long ; fourth scale 1.7 mm. long, in side view obovate-cuneate and 1 mm. wide at the 
truncate and obscurely crenulate apex, 3-nerved, the awn 1-1.25 mm. long; fifth scale 1 
mm. long ; sixth scale about 0.5 mm. long. 
In low land, southern Texas. Summer. 
8. Chloris barbàta (L.) Nash. Stems 5-10 dm. tall: leaf-blades 6 dm. long or 
less, 1 cm. wide or less, attenuate into long slender tips, smooth : spikes 6—25, flexuous 
and spreading, 5-15 cm. long: spikelets, exclusive of the awns, about 3 mm. long: scales 
6 ; outer empty ones acuminate ; third scale about 2.25 mm. long, in side view elliptic and 
about 0.75 mm. wide, the nerves pilose, the midnerve-hairs about 0.5 mm. long, the re- 
mainder of irregular length, 2-3 mm. long, the awn 3-4 mm. long ; fourth scale about 1.3 
mm. long, in side view obovate-elliptic and about 0.5 mm. wide, obliquely truncate at the 
crenulate apex, the awn 2.5-3 mm. long ; fifth and sixth scales smaller. 
j In sand or moist places, southern peninsular Florida. Also in the West Indies and South America. 
ummer. 
9. Chloris Prieüri Kunth. Stems 4-10 dm. tall: leaf-blades 1.5 dm. long or less, 3-6 
mm. wide, rough above and on the margins: spikes 4-15, 6-9 em. long, erect : spikelets, 
exclusive of theawns, about 4 mm. long: scales 7-9, the upper ones much reduced; outer 
empty scales acuminate, awn-pointed ; third scale, exclusive of the awn, 3-3.5 mm. long, 
in side view narrowly oblong and about 0.5 mm. wide, acute, a row of dark glands on each 
side of the glabrous midnerve, the lateral nerves glabrous below the middle, pilose above, 
the awn 8-13 mm. long, the palet gland-bearing between the nerves. 
Introduced at Wilmington, North Carolina, and on ballast at Mobile, Alabama. Summer. 
79. BUSTÁCHYS Desv. 
Perennial grasses, with flat or folded usually obtuse leaf-blades and spicate inflores- 
cence, the spikes single, in pairs, or 3-many and digitate. Spikelets usually 1-flowered, 
rarely 2-flowered, if the latter the upper flower staminate, sessile, crowded in 2 rows. 
Scales 4, rarely 5, the 2 lower empty, persistent, unequal, keeled, the first generally acute, 
the second oblong, truncate or 2-lobed at the apex, short-awned, the remaining scales awn- 
less, mucronate, or short-awned, firmer than the empty scales, the third scale enclosing 4 
perfect flower and a palet, the fourth scale empty, or rarely enclosing a staminate flower, 
