HITCHCOCK AND CHASE — NORTH AMERICAN GRASSES. 23 



Paeaguay : Sierra de Amambahy, Hassler 9864, 12087. 

 Peru : San Miguel, CooJc & Gilbert 923. 

 Bolivia: Yungas, Bang 494. 

 Argentina : Misiones, Ekman 616, 618. 



Explanation of Plate 18. — Lasiacis divaricata. Specimen from Ewarton, Jamaica, 

 Hitchcock 9427 (U. S. Nat. Herb. no. 975613). Natural size. 



10. Lasiacis globosa Hitchc. 



Lasiacis globosa Hitcbc. Contr. U. S. Nat. Herb. 17: 251. 1913. "Type in the 

 U. S. National Herbarium, no. 691226, collected at Acapulco, Mexico, by Edward 

 Palmer (no. 114 in 1894)." 



This species is described by Presl 1 under the name Panicum divaricatum 

 Lam. The specimen cited is from Acapulco. 



DESCRIPTION. 



Culms climbing, glabrous ; sheaths glabrous, ciliate on the overlapping mar- 

 gin ; ligule a narrow pilose membrane about 0.5 mm. long ; blades firm, elliptic- 

 lanceolate, scabrous on the margins and upper surface and more or less so 

 beneath, those of the flowering branches 8 to 12 cm. long, 1 to 2 cm. wide ; 

 panicle pyramidal, loosely flowered, 6 to 15 cm. long, the branches very scabrous, 

 widely spreading, the longer as much as 7 cm. long; spikelets on scabrous 

 pedicels 1 to 2 cm. long, globose, 3 mm. long ;j first glume circular, gibbous, 

 nerved, scabrous on the keel, ciliate on the membranaceous margin, about 1 mm. 

 long; second glume and sterile lemma glabrous and shining, equal, a little 

 shorter than the fertile lemma, reticulate-veined, lanate-ciliate on the rounded 

 apex ; fertile lemma umbonate, the point protruding from the second glume and 

 sterile lemma, this and the apex of the palea woolly. 



Characterized by its smooth blades and close or somewhat open panicle of 

 small globose spikelets. 



DISTRIBUTION. 



Copses near the sea, southern Mexico to Panama. 

 Guerrero : Acapulco, Palmer 114 in 1894 ; Haenke. 

 Panama : Chepo, Pittier 4688. Taboga Island, Hitchcock 8068. 



Explanation or Plate 19. — Lasiacis globosa. Specimen from Acapulco, Mexico, Palmer 

 114 in 1895, type collection (U. S. Nat. Herb. no. 744073). Natural size. 



11. Lasiacis sloanei (Griseb.) Hitchc. 



Panicum latifolium Hamilt. Prodr. PI. Ind. Occ. 10. 1825. Not P. latifolium 

 L. 1753. 



Panicum sloanei Griseb. Fl. Brit. W. Ind. 551. 1864. The species is based on 

 Sloane's plate 2 and Grisebach's two specimens from Jamaica, collected by 

 Purdie and by Wullschlaegel, the second of which has been examined in the 

 Grisebach Herbarium. 



Lasiacis sloanei Hitchc. Bot. Gaz. &¥: 302. 1911. Based' on Panicum sloanei 

 Griseb. 



a Rel. Haenk. 1: 306. 1830. 

 2 Voy. Jam. 1: pi. 71. f. 3. 1707. 



