POACEAE 115 
I. PETRAEAE 
Spikes numerous (10-25) : second glume truncate, not notched. 1. C. glauca. 
durius rarely more than 6. 
mm. long: second glume mucronate from a notched 
pee 2. C. petraea. 
Spies 3 mm. long. 
Spikes 1 or 2, rarely 3. . C. floridana. 
SDikes 4 to 6, rarely more. . C. neglecta. 
Oo 
II. VIRGATAE 
Rudiment narrow: awns about 8 mm. lon b. C. Prieuri. 
Rudiment truncate, broadened above: awns 3-5 mm. lo 
Plants strongly stoloniferous: lemmas pilose on 'ne . C. Gayana. 
Plants without stolons: lemmas strongly ciliate-villous. 1. C. polydactyla. 
1. C. glauca (Chapm.) Vasey. Stem stout, 50—150 em. tall, one or more nodes 
with opposite, d edd leaf-sheaths: leaf- blades as much as 1.5 em. wide: 
spikes 5-15 em. yn spikelets about 2 
mm. long. [£. M Chapm. ]|—Brackish 
marshes, prairies, ei cypress swamps, Fla. 
to N. C. 
2. C. petraea Swartz. Stem 30-100 cm. N 
tall: eed sheaths perd sie p blades 
4—10 wide: spik 4—6, sub- 
erect, 4-10 em. long. "DE. pr Desv.] 
—Dry soil, hammocks, p and prai- 
ries, Coastal Plain, Fla. to Tex. and N. C.— 
W. I., Mez., C. A., .) 
3. C. floridana (Chapm.) Vasey. Stem 40- 
100 cm. tall: e sheaths not pi leaf- 
blades 4—8 wide: spikes erect, 5—10 
em. long. [E. floridana Chapm. Dre sandy soil, woods, and old fields, Coastal 
Plain, N Fla. and Ga. 
4. C. neglecta Nash. Similar to bd floridana, usually taller and stouter: leaf- 
exec commonly paired: spikes more numerous, usually longer. [E. neglecta 
ash ]—Open sandy ocd and an Fla. 
5. C. ids Kunth. Perennial es stems 30-60 em. tall: es blades 2-3 
wi ie es 2—8, erect, 5—8 em. long: sius lemma 2.5 mm. long, ciliate 
near Mu it: rudim ent na rrow, bearing 30 wns.—W aste ends Mobile, 
Ala., and Wilmington, N. C. Nat . of Africa. 
6. C. Gayana Kunth. Plant d stout stolons & meter or more long: 
dun tufted, 100—150 id bon lea a des 3-5 mm. wide: spikes mostly a 2 
raight, ascending o 6$ . long, 1 opulentis pilose.— 
died )—Fields and ddr various provinces, Fla. to Miss., Tex., aa "S 
Calif. Nat. of Afr. 
7. C. s id Swartz. Perennial: ida 50-100 em. tall: leaf- irae 
as much as spikes s several to many, flexuous, tawny, mostly 8-1 
m. long. ro. potes Nash] «Open sandy soil, S Fla (F. I 'g. A.) 
75. GYMNOPOGON Beauv. Rigid perennials with short flat stiff blades, 
numerous stiff slender divergent spikes loosely scattered along the upper part 
of the stem, often deflexed at maturity. Spikes 1 or rarely 2-4-flowered, nearly 
sessile, appressed and usually remote in 2 rows, along 1 side of a slénder con- 
