HITCHCOCK—GRASSES OF CUBA. 217 
Culms not slender nor decumbent-spreading. 
First glume obtuse or truncate, one-fourth 
the length of the acuminate spikelet....... 5. P. 
First glume acute to acuminate, more than 
one-third the length of the spikelet. 
Sheaths glabrous. 
Panicle very diffuse, the branches 
capillary; spikelets less than 1.5 
mm. long.........-..---------+-- 45. P. tricanthum. 
Paniclescarcely diffuse, the branches 
not capillary; spikelets 2 mm. or 
Ne 
chloroticum. 
more long. 
Culms slender; spikelets 2 mm. 
long ...--.-. eee cee eee eee 10. P. diffusum. 
Culms tall and stout, 5to 10mm. 
in diameter; spikelets acumi- 
nate, about 5 mm. long....... 3. P. aquaticum. 
Sheaths hispid. 
Annual; panicle branches divari- 
cate 2.22... eee eee ee ee eee eee eee 4. P. 
Perennial; panicle branches ascend- 
ing. 
Spikelets 2 mm. long, panicle 
compact .......-..--.------- 20. P. hirsutum. 
Spikelets 3 mm. long, panicle 
loose .....----- Lecce eee eeeee 21. P. hirtivaginum. 
YS 
CAYENNENSE . 
1. Panicum acuminatum Sw. Prod. 23. 1788. 
Panicum comophyllum Nash, Bull. Torr. Club 80: 380. 1903. 
Dry savannas, San Cristobal, August, Wright 3874; Herradura, Baker & Dimmock 
HC 4871, Tracy 9078, Hitchcock in 1906; Pinar del Rio, Shafer 320 in part, Pulmer 
& Riley 447; Isle of Pines, Curtiss 328, 307, Taylor in 1901, Palmer & Riley 989, 
1065, 1083, Taylor 33 in Herb. N. Y. Bot. Gard. 
The type of P. acuminatum at Stockholm is a specimen in the autumnal state. 
Wright’s 3874 in the Gray Herbarium is labeled ‘‘Low savannas, Chirigote, Nov. 
2.” Another specimen in the Gray Herbarium, without number, is from ‘‘Savan- 
nas, Pueblo Nuevo, San Cristobal, May 16.”’ 
2. Panicum adspersum Trin. Gram. Pan. 146. 1826. 
Wright 3869; Santiago de las Vegas, Baker IC 387, 512, 1050, 1825, 2057, Hitch- 
cock in 1906, Tracy 9109; Triscornia, [Hitchcock in 1906; Habana, Curtiss 748, Leon 
291,570; Herradura, Tracy 9102; Cabatias, Palmer & Riley 746,771; Matanzas, Britton, 
Britton & Shafer 596. In the Herbarium of the New York Botanical Garden are 
the following: Isle of Pines, Curfiss in 1904; Pinar del Rio, Shafer 504. 
Wright’s specimen in the Sauvalle Herbarium bears the secondary number 304 
in addition to the distribution number. Grisebach’s specimen bears the secondary 
number 304 (1865). The specimen in the Gray Herbarium bears the secondary 
number 269. Trinius’s type is from Santo Domingo, sent by Sprengel, and is the 
plant from which the plate is drawn.¢ The spikelets are about 3 mm. long and 
sparsely hispidulous. The culms are geniculate and rooting below; the blades 
spreading and 4 to8 cm. long. A larger form occurs in Florida, with culms as much 
as 1 meter high, and blades 15 cm. long and 1.5 cm. wide, the spikelets larger, as 
much as 4 mm. long. This is represented in Cuba by Curtiss 748 and Palmer & 
Riley 771. An examination of considerable material from the West Indies and Flor- 
@ Jeon. 169. 
