274 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



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

 and Trinidad (Arinia, Broadivay 2374). 



6. ERIANTHUS Michx. 



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

 arranged in a large dense panicle. 



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



A robust tall erect unbranched perennial with long harshly pubescent blades 

 and -tawny or purplish 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 Floridam." 



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

 Mateo, Wright 3903). 



Eeianthus eavennae (L.) Beauv. (Saccharum jamaicense Trin., 1 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 1 o sum. 

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



2. I. latifolium. 



1. Ischaemum rugosum 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, Rev. Gram. 1: 168. 1829. 

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

 Ischaemopogon 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 eottboellioides Desv. ; Hamilt. Prodr. PI. Ind. Occ. 11. 1825. 

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



'Mto. Acad. St. Petersb. VI. Math. Phys. Nat. 2: 312. 1832. 



