290 CONTEIBUTIONS FROM THE NATIONAL HERBARIUM. 



1. Arundinella confinis (Schult.). 

 Piptatherum confine Schult. Mant. 2: 184. 1824. 

 Arundinella martinicensis Trin. Gram. Pan. 62. 1826. 



Agrostis berteriana Spreng. ; Steud. Nom. Bot. ed. 2. 1: 39, 143. 1840. 



A tufted erect perennial with strong slender simple culms up to 2.5 meters 

 tall, flat blades, scabrous at least on the upper surxace, and rather densely 

 flowered oblong panicles 20 to 40 cm. long. 



Grassj'^ slopes, West Indies and southern Mexico to Paraguay. Described from 

 Martinique, Sicber 265 being the type of Piptatherum confine and Sieber 262 

 being the type of Arundinella martinicensis. The Cuban name is " caiiuela de 

 sabana." 



Cuba, Jamaica, Haiti, Santo Domingo, Porto Rico, Guadeloupe, Dominica, 

 Martinique, St. Vincent, Trinidad, and Tobago. 



2. Arundinella deppeana Nees in Steud. Syn. PI. Glum. 1 : 115. 1854. 

 Similar to the preceding, the panicle branches on the average longer and 



laxer, the awns longer. 



Moist places, Mexico to Brazil ; also in central and western Cuba. Originally 

 described from Mexico. 



3. Arundinella berteroniana (Schult.). 

 Trichochloa berteroniana Schult. Mant. 2: 209. 1824. 

 Thysanachne peruviana Presl, Rel. Haenk. 1: 253. 1830. 

 Muhlenbergia berteroniana Kunth, Enum. PI. 1: 202. 1833. 



Podosacmum mrens Balb. ; Kunth, loc. cit. as synonym of Muhlenbergia ber- 

 teroniana. 



Arundinella peruviana Steud. Syn. PI. Glum. 1: 115. 1854. 



Arundinella cubensis Griseb. Mem. Amer. Acad. n. ser. 8: 533. 1862. 



Smaller, more slender than nos. 1 and 2, with narrower, folded or involute 

 blades and more open fewer flowered panicles with slightly larger spikelets. 



Moist places, Mexico to Brazil ; also Hispaniola and central and eastern 

 Cuba. Originally described from Santo Domingo. Thysanachne peruviana was 

 described from Peru. The type specimen of Arundinella cubensis is Wright 

 1552. 



24. TBISCENIA Griseb. 



Spikelets short-pedicellate, narrow, awnless, the fruit inclosed in the in- 

 folding second glume and sterile lemma. 



1. Triscenia ovina Griseb. Mem. Amer. Acad. n. ser. 8: 534. 1862. 



A tufted perennial with filiform culms and blades, compressed, subindurate 

 sheaths crowded at the base, and attenuate few-flowered panicles. 



Only known from two collections from eastern Cuba, the type, Wright 756, 

 and Shafer 3668 from Piedra Gorda to Rio Seboruco. 



25. ACHLAENA Griseb. 



Spikelets with the rachilla produced into a pointed callus ; first glume re- 

 duced to a long slender awn, the second glume awned from the summit ; sterile 

 lemma awnless, infolding the membranaceous fertile lemma and palea. 



From Griscbach's description of the genus it is evident that he failed to note 

 the palea, mistaking the sterile lemma for the fertile lemma (flos fertilis) and 

 the fertile lemma for the palea, stating as he does that the palea is 1-nerved. 

 Bentham & Hooker ^ and Hackel ' follow Grisebach in this disposition of the 



'Gen. PI. 3: 1117. 1883. 



* In EngL & Prantl, Pflanzenfam. 2': 41. 1887. 



