ICITCHCOCK AND CHASE TEOPICAL NORTH AMERICAN PANICUM. 507 



DISTRIBUTION. 



Wet savannas and margins of ponds and streams, Costa Rica and the West Indies to 

 Paraguay. The type specimen from tropical America. 



Costa Rica: Buenos Aires, Tonduz 3631, 3659, Pitticr 1059A. 



Cuba: Los Almacigos, Wright 3458. Herradura, Baher 2078, Traaj 9060, 



9079, Hitchcock 181, Britton, 



Earle & Gager 6494. Pinar 



del Rio, Britton <k Gager 



7075. Guane, Shafer 10659. 



Laguna Los Indios, Shafer 



10803. 

 Porto Rico: Lake Loisa, Chase 



6786. Campo Alegre, Chase 



6615, 6788. Aguada, Sintenis 



5719. Guainabo, Chase 6630. 



Cataiio, Sintenis 5719. Mar- 

 tin PeBa, Chase Q35S. Trujillo 



Alto, Chase 6763. Vega Baja, Chase 6796, Heller 1316. 

 Trinidad: Cumuto Station, Hitchcock 10065, Amer. Gr. Nat. Herb. 72. Pitch 



Lake, Hitchcock 10100. Arima, Broadway 2372. Without locality, Crueger, 



224. , 



w^ ■ ■ '— - -\ 



J I \ Y Ld 



tXYj 



V 1 -o 



\\\"\ m 



V 0-, 



WK 



^f^:^^^.*'-'-^ 



si"tn^ 



J'Yj "^^ : 



^^■'-i,r^^^, 



■\^""*'l' **# 



^Xo ^ 



— ~1 ci— ' — v^ . t V^* 





^^~^<^/ y^^^^^^"^ 





M>::f^{ 



Fig. 92. — Distribution of P. 'parvifolium. 



CA^^^^^CCiJii^- , 



-iCi-' 



70. Panicum cyanescens Nees. 



PanicuTYi cyanescens Nees;: Agrost. Bras. 220. 1829. "Habitat in Brasilia meridionali 

 (Sellow). " The type is in the Berlin Herbarium. 



Panicum firmifoliuTn Trin.; Nees, loc. cit. A herbarium name given as a synonym 

 of P. cyanescens. 



description. 



Plants perennial, bluish or glaucous; culms tufied, erect or with a decumbent base 

 rooting at the nodes, slender, smooth, leafy, 30 to 50 cm. high, branching from the mid- 

 dle and upper nodes; sheaths striate, glabrous, rarely ciliate on the overlapping margin; 

 ligule minute, membranaceous, sparsely ciliate with long hairs or sometimes naked; 

 blades flat, rather firm, erect, spreading or reflexed, 3 to 8 cm. long, 4 to 5 ihm. wide, 

 oblong-lanceolate, slightly narrowed to the base, acute, 

 glabrous; panicles short-exserted, terminal and often from, 

 the upper sheaths, 3 to 6 cm. long, as wide or wider, open, 

 the slender flexuous branches rather remote, stiffly ascend- 

 ing or spreading, naked below, branching and spikelet- 

 bearing toward the ends, the spikelets on slender divaricate 

 pedicels; spikelets about 1.5 mm. long, 0.9 mm. wide, turgid 

 or subglobose, obtuse, glabrous; first glume two-thirds to 

 three-fourths as long as the spikelet; second glume and sterile 

 lemma equal, covering the fruit, or at maturity the glume wrinkled because of the 

 turgidity of the fi'uit, exposing the summit; fruit 1.2 mm. long, 0.8 mm. wide, very 

 turgid, subacute, the lemma and palea cellular-roughened as seen under a lens, 

 bearing a few very obscure apprcssed haii's toward the summit. 



This species resembles P. parvifoliwn, but differs in the less slender, more erect 

 culms, longer blades, and stiffly ascending panicle branches, naked below. 



¥iG. 93.— P. cyanescens. 

 From type specimen. 



