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. 



In sandy soil, Texas. Summer. 



5. Chloris latisquamea Nash. Stems 2-6 dm. tall : leaf-blades 1-10 cm. long, 2-4 

 mm. wide, obtuse, rough : axis of the inflorescence 1.5 cm. long or less : spikes 10-16, 3-7 

 cm. long, finally widely spreading : spikelets, exclusive of the awns, 2.3-2.8 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 cucullata 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. 



In sandy soil, Texas. Fall. 



7. Chloris Texana (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 y 4_g 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 barbata (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. 



In sand or moist places, southern peninsular Florida. Also in the West Indies and South America. 

 Summer. 



9. Chloris Prieuri 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 cm. long, erect : spikelets, 

 exclusive of the awns, 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 8-1 3 mm. long, the palet gland-bearing between the nerves. 



Introduced at Wilmington, North Carolina, and on ballast at Mobile, Alabama. Summer. 



79. EUSTACHYS 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 a 

 perfect flower and a palet, the fourth scale empty, or rarely enclosing a staminate flo-wer, 



