190 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Lemma awned. 



Lemma indurated, convolute, awn 3-fid (lateral awns minute or 



wanting in A. scabra) 51. Aristida (p. 235). 



Lemmas not indurated, tapering into a capillary awn. 



52. Muhlenbergia (p. 237). 

 Spikelets 2 to many-flowered. (Festuceae.) 



Lemmas cleft above into a pappus-like crown of bristles. 



61. Pappophorum (p. 242). 

 Lemmas entire. 



Lemmas clothed with long silky hairs, tall, reed-like, dioecious 



grasses 62. Gynerium (p. 242). 



Lemmas not clothed with silky hairs. 



Lemmas3-nerved,notatallindurated.63. Eragrostis (p. 242). 

 Lemmas many-nerved, somewhat indurated and rigid. 



Sterile lemmas 1 to 3 above the glumes; plants not 



dioecious 64. Uniola (p. 245). 



Sterile lemmas above glumes none; plants dioecious. 



65. Distichlis (p. 245). 



CATALOGUE OF GENERA AND SPECIES. 

 1. COIX L. Sp. PI. 972. 1753. 



1. Coix lachryma-jobi L. Sp. PI. 972. 1753. 



Pinar del Rio, Baker A- Abarca, HC 3686; El Guama, Palmer & Riley 142. 



This is originally from tropical Asia, but is now cultivated for ornament in the 

 warmer regions of both hemispheres, whence it has escaped. 



2. IMPERATA Ciril. PI. Rar. Ic. 2: 26. pi. 11. 1792. 



1. Imperata brasiliensis Trin. Mem. Acad. Pelersb. VI. 2: 331. 1833. 



La Magdalena, Baker HC 4946; Madruga, Britton 630; without locality, Wright 

 3486; Cienfuegos, Combs 701, in Gray Herbarium; Isle of Pines, ('nrtiss in 1904 in 

 Herb,N. Y. Bot. Gard.; Pinar del Rio, Shafer 310 in Herb. N. Y. Bot. Gard. 



The type in the Trinius Herbarium is from Serra da Lapa, Brazil, though Trinius 

 in the original publication cites merely "V. spp. Brazil." /. caudata Trin., as 

 shown by the type in the Trinius Herbarium, differs in having smaller spikelets 

 (about 2.5 mm. long), longer and more copious hairs, and an elongated inflores- 

 cence. The spikelets of I. brasiliensis are 4 mm. long. Wright's specimen (3486) 

 is the latter species as shown by the specimen in the herbarium of Grisebach and 

 in that of Sauvalle. This is referred to /. caudata by Grisebach" and Sauvalle> 



3. SACCHARUM L. Sp. PI. 54. 1753. 



1. Saccharum officinarum L. Sp. PI. 54. 1753. 



Cienfuegos, PringJe 17; Guanajav, Curtiss 635. 



This species (sugar cane) is grown in all tropical countries, and the above speci- 

 mens are from cultivated plants. 



4. ERIANTHUS Michx. IT. Bor. Amer. 1: 54. 1803. 



1. Erianthus saccharoides Michx. Fl. Bor. Amer. 1: 55. 1803. 



Laguna San Mateo, Pinar del Rio, Wright 3903. 



In Sauvalle's Flora Cubana this is called Andropogon alopecuroides L. The latter 

 species, however, has a twisted awn, while in E. saccharoides the awn is straight or 

 only slightly bent, not twisted. 



a Cat. PL Cub. 236. 1866. 



bAnal. Acad. Cienc. Habaua 8: 288. 1871; Fl. Cub. 202. 



