16 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Panama : Corozal, Pittier 6774. Frijoles, Hitchcock 8393. Gattin, Hitchcock 

 79S4. El Boquete, Hitchcock 82S3. Taboga Island, Hitchcock 8087. Pedro 

 Miguel, Hitchcock 7961. 



Colombia: San Andres de la Sierra, Pittier 1645. Santa Marta, Smith 117. 



Venezuela: Without locality, Fendler 2429. Caoma, Jahn 314. 



Explanation of Plate 10. — Lasiacis procerrima. Specimen from El Boquete, Panama, 

 Hitchcock 8283 (U. S. Nat. Herb. no. 946902). Natural size. 



2. Lasiacis rugelii (Griseb.) Hitchc. 



Panicum rugelii Griseb. Cat. PI. Cub. 233. 1866. " Cuba occ. ; in fruticetis 

 montium pr. Matanzas (Rug. 188)." Grisebach describes the plant as climbing, 

 because Rugel's label had upon it " scandens." 



Lasiacis rugelii Hitchc. Bot. Gaz. 51: 302. 1911. Based on Panicum rugelii 

 Griseb. 



DESCRIPTION. 



Culms much branched, prostrate, the main culms slender, mostly about 2 mm., 

 sometimes 2.5 mm. thick, appressed-hispidulous, the sterile shoots prostrate, 

 dorsiventral, the leaves strongly distichous, approximate, the fertile shoots 

 sometimes ascending toward the end ; sheaths overlapping, hispidulous, villous 

 on the margin and around the summit; ligule inconspicuous; blades lanceolate 

 or oblong-lanceolate, 2 to 5 cm. long, 4 to 12 mm. wide, hispidulous or puberu- 

 lent on both surfaces ; panicles few-flowered, usually not over 5 cm. long, the 

 few branches spreading, the axes pubescent, scabrous on the angles ; spikelets 

 5 mm. long. 



DISTRIBUTION. 



Rich thickets, western Cuba, Yucatan, and San Luis Potosi. 

 San Luis Potosi : San Dieguito, Palmer 151 in 1904. Rio de las Gallinas, 



Purpus 5438. 

 Quintana Roo : Lake Chichankanab, Gaumer 23685. 

 Cuba : Sierra de Anafe, Wilson 11449. Valestina, Wright 3465. San Antonio, 



Hitchcock 176. Isle of Pines, Britton & Wilson 14S60. Without locality, 



Reed. 



Explanation of Plate 11. — Lasiacis rugelii. Specimen from Valestina, Cuba, Wright 

 3465 (U. S. Nat. Herb. no. 975684). Natural size. 



3. Lasiacis grisebachii (Nash) Hitchc. 



Panicum grisebachii Nash, Bull. Torrey Club 35 : 301. 1908. The designated 

 type is from Madruga, Cuba, Britton d- Shafer 758. Nash gives the specific 

 name because Grisebach * refers Wright's no. 3457 to Panicum martinicense 

 Griseb. This specimen Nash cites under P. grisebachii. 



Lasiacis grisebachii Hitchc. Bot. Gaz. S4: 302. 1911. Based on Panicum 

 grisebachii Nash. -5"f * 



DESCRIPTION. 



Culms much branched, glabrous, the main culms creeping and rooting at the 

 nodes, as much as 2 mm. in diameter, the sterile shoots erect or ascending, 

 20 to 40 cm. high ; sheaths hispidulous. especially on the margin, or the sur- 

 face glabrescent; ligule inconspicuous; blades narrowly lanceolate, 6 to 12 cm. 

 long, 5 to 10 mm. wide, puberulent beneath, glabrous above, scabrous on the 



1 Cat. PI. Cub. 233. 1S66. 



