334 CONTRIBUTIONS FEOM THE NATIONAL HERBAEIUM. 



mayarense is from Mayari ; of Ichnanthus wrightii from the Rio Seco in Arroyo 

 Hondo, Pinar del Rio. 



2. Ichnanthus tenuis (Presl). 



Oplismenus tenuis Presl, Rel. Haenk. 1: 319. 1830. 



Panicum alsinoides Griseb. Fl. Brit. W. Ind. 550. 1864. 



A slender creeping, lightly rooted, freely branching leafy annual, with ascend- 

 ing dorsiventral flowering shoots, pilose sheaths, lanceolate, softly pubescent 

 blades oblique at base, and tei-minal and axillary panicles with few to several 

 long simple ascending branches, the spikelets with a delicate attenuate tip. 



Damp, shady banks, Central America and northern South America, and in 

 Trinidad. Type specimen from Panama. Panicum alsinoides was described 

 from Jamaica, St. Kitts, and Trinidad. A specimen in the Gray Herbarium 

 labeled Panicum alsinoides, collected in Jamaica by March, is Oplismenus 

 setarius. Ichnanthus tenuis is not known to us from Jamaica. 



3. Ichnanthus nemorosus (Swartz) Doell in Mart. Fl. Bras. 2^: 289. 1877. 

 Panicum nemorosum Swartz, Prodr. Veg. Ind. Occ. 22. 1788. 



Milium nemorosum Moench, Meth. Suppl. 67. 1802. 



A creeping, freely branching perennial with unsymmetrical, narrowly ovate- 

 acuminate spreading, sparsely pilose blades and rather few-flowered short- 

 exserted terminal and axillary panicles. 



Shady banks and rich woods. West Indies and Central America. Originally 

 described from Jamaica. 



Cuba, Haiti, Santo Domingo, Jamaica, St. Kitts, Martinique, St. Vincent, 

 Grenada, and Trinidad. 



4. Ichnanthus pallens (Swartz) Munro; Benth. Fl. Hongk. 414. 1861. 

 Panicum pallens Swartz, Prodr. Veg. Ind. Occ. 23. 1788. 



Similar to the preceding, stems longer ; blades longer, relatively narrower, 

 glabrous (rarely with a few scattered hairs) ; panicles larger. Rather fre- 

 quently in this species (and rarely in the others) the spikelets are altered to 

 a series of closely imbricate, sometimes pubescent empty sterile lemmas strik- 

 ingly different in appearance from the normal spikelets. 



Rich woods and shady banks. Tropics of the Western Hemisphere. Origi- 

 nally described from Jamaica. Common on all the islands from Cuba to 

 Trinidad. 



3. Ichnanthus axillaris (Nees). 



Panicum axillare Nees, Agrost. Bras. 141. 1829. 



On the average stouter than /. pallens but the stems often short ; blades broad 

 for their length ; panicles larger, more numerous, sometimes produced from all 

 the upper nodes, more densely flowered. Like the preceding, this species is ex- 

 ceedingly variable. 



Moist, more or less shaded slopes in the uplands, Santo Domingo, Porto Rico, 

 Trinidad, and Tobago to Ecuador and Brazil. Originally described from Brazil. 



6. Ichnanthus leiocarpus (Spreng. ) Kunth, R6v. Gram. 1: Suppl. X. 1830. 

 Panicum leiocarpon Spreng. Neu. Entd. 1: 243. 1820. 



Navicularia lanata Raddi, Agrost. Bras. 40. 1823. 



Culms slender, 1 to 2 meters tall, with villous or lanate sheaths, lanceolate 

 blades, pubescent on both sides, and large open panicles. 



Trinidad (Trin. Bot. Gard. Herb. 3318) to Brazil. Originally described from 

 Brazil. 



7. Ichnanthus nemoralis (Schrad.). 



Panicum nemoralc Sclu-ad. ; Schult. Mant. 2: 255. 1824. 

 Panicum martianum Nees, Agrost. Bras. 138. 1829. 



