HITCHCOCK AND CHASE— NOETH AMERICAN PANICUM. 135 



i-t-aiB&-fa.t-522-pag-esia arll-tb-e^copies we hfliVP! seea-. The type is undoubt- 

 edly the Hoffmansegg specimen mentioned above. 



Panicum oplismenoides Nash, Bull. Torrey Club 30 : 381. 1903, not Hack. 1888. 

 "Collected on the edge of a ditch at Vega Baja, May 9, 1899, by Heller, no. 1316." 

 The type is in the herbarium of the New York Botanical Garden. 



DESCRIPTION. 



Plants perennial, cespitose, decumbent or creeping, rooting at the lower nodes, 

 glaucous and glabrous throughout, except as noted; culms slender, branching, 20 to 

 80 cm. long, leafy, with numerous short internodes, the nodes sometimes sparsely 

 pilose; sheaths rarely over 1 cm. long, ciliate, and some- 

 times, especially on young shoots, sparsely pilose; ligules 

 nearly obsolete; blades 1 to 3 cm. long, 2 to 6 mm. wide, 

 oblong-lanceolate, rounded or subcordate at base, spreading 

 or reflexed, or the upper and often those of young shoots 

 appressed, sometimes sparsely pilose at the base; panicles 

 Fig. 130.— p. parvifolium. short-exserted, 2 to 4 cm., rarely 6 cm. long, about as wide. 

 From type specimen. loosely flowered, the slender, flexuous branches spreading, 

 the branchlets and pedicels divergent; spikelets about 1.5 

 mm. long, 0.8 mm. wide, turgid, blunt, glabrous; first glume slightly more than half 

 the length of the spikelet, subacute, 3-nerved; second glume and sterile lemma sub- 

 equal, 5-nerved, the sterile palea nearly as long as its lemma; fruit 1.4 mm. long, 

 0.8 mm. wide, ovate, smooth and shining. 



DISTRIBUTION. 



Damp shady places, Costa Rica and the West Indies, south to Brazil and Paraguay. 

 Costa Rica: Buenos Aires, Pittier 10594, Tonduz 3631. 

 Cuba: Los Almacigos, Wright 3458; Herradura, Baker 2078, Hitchcock 181, Tracfy 



9060, 9079. __ _-_ - 



Porto ^ico'S^mtenis 5719, 1216 (Krug & Urban Herb.);)Vega Baja, Heller & 



Heller 1316. '^ 

 Trinidad: Broadivay 2372. 

 British Guiana: Schomhurgk 407. 



Dutch Guiana: Surinam, no collector given (Gray Herb.). 

 French Guiana: No data (Gray Herb.). 

 Brazil: Falls of St. Gabriel, Spruce 2207; Santarem, Spruce 632; Sao Paulo, Lof- 



gren 1124; Campinas, Novaes 1245; without locality, Riedel 958. 

 Paraguay: Morong 519. 



/ 78. Panicum millegrana Poir. f\J ^^ 



Panicum hirsutum Lam. Encycl. 4:741. 1798, not Swartz, 1797. "Cette plante 

 croit a Cayenne, d'ou elle a ete envoyee par le citoyen Leblond." The type, in the 

 Paris Herbarium, labeled "Cayenne, Le Blond," has glabrous spikelets. 



Panicum millegrana Poir. in Lam. Encycl. Suppl. 4:278. 1816. "Cette plante 

 croit dans I'Araerique meridionale ( F. s. in herb. Desfont).'" This specimen was not 

 found in the Desfontaine Herbarium at Florence. In the Paris Herbarium is a 

 specimen from "Cayenne, Martin," labeled "Panicum millegrana Poir.," which 

 appears to be authentic and may be the type. Poiret's description applies well to 

 this plant and to the species known as P. rugulosum Trin. The spikelets are glabrous 

 as in the type of that species. 



Panicum rugulosum Trin. Gram. Pan. 195. 1826. "Brasil (Langsdorfp.)" The 

 type, in the Trinius Herbarium, has glabrous spikelets. 



