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. chloroticum. 



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. 



Panicle scarcely diffuse, the branches 

 not capillary; spikelet.- 2 mm. or 

 more long. 



Culms slender; spikelets 2 mm. 



long 10. P. diffusum. 



Culms tall and stout, 5 to 10 mm. 

 in diameter; spikelets acumi- 

 nate, about 5 mm. long 3. P. aquaticum. 



Sheaths hispid. 



Annual; panicle branches divari- 

 cate 4. P. cayennense. 



Perennial; panicle branches ascend- 



ing. 



Spikelets 2 mm. long, panicle 

 compact 20. P. hirsutum. 



Spikelets 3 mm. long, panicle 



loose 21. P. hirtivaginum . 



1. Panicum acuminatum Sw. Prod. 23. 1788. 



Panicum comophyllum Nash, Bull. Torr. Club 30: 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, Palmer 

 & Filey 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 HC 387, 512, 1050, 1825, 2057, Hitch- 

 cock in 1906, Tracy 9109; Triscornia. Hitchcock in 1906; Habana, Curtiss 748, Leon 

 291,570; Herradura, Tracy 9102; Cabanas. Palmer & Riley 746, 771; Matanzas, Britton, 

 Britton & Shafer 596. In the Herbarium of the New York Botanical Garden are 

 the following: Isle of Pines, Curtiss 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 :'> mm. long and 

 sparsely hispidulous. The culms are geniculate and rooting below; the blades 

 spreading and 4 to 8 cm. long. A larger form occurs in Florida, with culms as much 

 as I meter high, and blades 15 cm. long ami 1.5 cm. wide, the spikelets larger, as 

 much as 4 mm. long. This is represented in Cuba by Curtiss 748 and I'ulmt, a 

 Riley 771. An examination of considerable material from the West Indies and Flor- 



Icon. 169. 



