274 CONTRIBUTIONS FEOM THE NATIONAL HERBARIUM. 



Porto Rico (near San Juan and Maricao), Santo Domingo, Haiti, Martinique, 

 and Trinidad (Arima, Broadway 2374). 



6. ERIANTHUS Michx. 



Spikelets all perfect, awned, silky-pubescent; rachis disjointing; racemes 

 arranged in a large dense panicle. 



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



A robust tall erect unbranched perennial with long harshly pubescent blades 

 and tawny or purplisli plumy panicles up to 40 cm. Jong. 



Swamps and moist soil from New Jersey to Florida and Texas on the Coastal 

 Plain ; also in Cuba. No definite locality is mentioned in the original descrip- 

 tion, but the range is given " a Carolina ad Floridani." 



Cuba (Laguna Jovero to Laguna Herradura, Shafer 10934, and Laguna San 

 Mateo, Wright 3903). 



Erianthus eavennae (L.) Beauv. {Saccharum jamaicense Trin.,* Erianthus 

 jamaicensis Anderss. ; E. ravennae var. jamaicensis Hack.) was described by 

 Trinius from Jamaica, but his specimen was doubtless a cultivated plant, the 

 species being grown for ornament in warm climates. 



7. ISCHAEMUM L. 



Sessile spikelets perfect, awned ; pedicellate spikelets perfect but not always 

 fruitful ; rachis disjointing ; racemes 2 to several, digitate, in pairs, usually so 

 appressed to each other as to appear like a single spike. 



Racemes 2 at the apex of the culms ; first glume strongly rugose across the back. 



1. I. rug'osum. 

 Racemes several in a cluster at the apex of the culms ; first glume not rugose. 



2. I. latifolium. 



1. Ischaemum rug'osum Salisb. Icon. Stirp. Rar. 1: pi. 1. 1791. 



A branching annual, geniculate below, with bearded nodes and flat, sparsely 

 pilose blades, the 2 erect racemes so closely appressed to each other as often 

 to appear like a single spike. 



Waste places in Cuba and Jamaica ; introduced from the Old World. Origi- 

 nally described from India. 



2. Ischaemum latifolium (Spreng.) Kunth, R6v. Gram. 1: 168. 1829. 

 Andropogon latifolius Spreng. Syst. Veg. 1: 286. 1825. 

 Ischaeinopogon latifolius Griseb. Fl. Brit. W. Ind. 560. 1864. 



Larger and stouter than the preceding, decumbent, rooting at lower nodes, 

 the glabrous blades up to 20 cm. long and 3 cm. wide, the inflorescence fan- 

 shaped. 



Moist, shady places, southern Mexico and the Lesser Antilles to Brazil and 

 Ecuador. Originally described from the West Indies, Guadeloupe and Mar- 

 tinique being mentioned. 



Guadeloupe, Dominica, Martinique, St. Lucia, St. Vincent, and Trinidad. 



Ischaemum angustifolium (Trin.) Hack. In the herbarium of the Botani- 

 cal Department, Trinidad, is a specimen of this collected in 1895 by J. H. Hart, 

 and said to be introduced. It is distinguished by its elongate narrow blades. 



Rhytachne rottboellioides Desv. ; Hamilt. Prodr. PI. Ind. Occ. 11. 1825. 

 Described from a specimen purporting to be from the "Antilles " in the 



' M6m. Acad. St. P6tersb. VI. Math. Phys. Nat. 2: 312. 1832. 



