336 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Panicles many-flowered, usually 15 to 25 cm. or more long; 
branches straight or arcuate, not zigzag; blades mostly 
over 1.5 cm. wide. 
Spikelets 4.5 to 5 mm. long, on short stiff appressed 
pedicels -..--..------------ ee 7. L. sloanei. 
Spikelets 3.5 to 4 mm. long, on flexuous pedicels. 
8. L. patentiflora. 
Blades pubescent on one or both surfaces. 
Blades narrowly lanceolate, averaging 8 to 10 times as long as 
wide; panicle large and open_____________ 9. L. sorghoidea, 
Blades ovate-lanceolate, usually 8 to 5 times as long as wide; 
panicle usually compact, rather narrow___10. L. ruscifolia. 
1. Lasiacis rugelii (Griseb.) Hitche. Bot. Gaz. 51: 302. 1911. 
Panicum rugelit Griseb. Cat. Pl. Cub. 233. 1866. 
Prostrate, the main canes slender; branches commonly fascicled, very leafy, 
the pubescent sheaths overlapping, the small lanceolate firm puberulent, some- 
what cinereous blades oblique at base; panicles short-exserted, few-flowered. 
Rich woods, western Cuba, whence originally described, the type specimen 
being Rugel 188 from Matanzas. Richard’ refers this species to Panicum rusci- 
folium H. B. K. 
2. Lasiacis grisebachii (Nash) Hitche. Bot. Gaz. 51: 302, 1911. 
Panicum grisebachti Nash, Bull. Torrey Club 35: 301, 1908. 
Stems more slender, freely producing rootlets, the long narrow blades not 
crowded; panicle branches ascending. 
Rich woods and shady banks, carpeting the floor of dark thickets, western 
Cuba, whence originally described, the type specimen being Britton & Shafer 
758 from Madruga. 
8. Lasiacis oaxacensis (Steud.) Hitche. Proc. Biol. Soc. Washington 24: 145. 
1911. 
Panicum oaxacense Steud. Syn. Pl. Glum, 1: 73. 1854, 
Slender, straggling, decumbent and geniculate at base, with numerous aerial 
rootlets, the long branches ascending and arcuate, with narrow scabrous blades 
commonly 20 cm. long, and large open few-flowered panicles, the spikelets borne 
at the ends of the branchlets. 
Edges of woods, western Jamaica, Mexico, and Central America. Originally 
described from Oaxaca. 
4. Lasiacis harrisii Nash, Torreya 13: 274. 1913. 
Climbing among bushes to a height of 5 meters or more, the main canes 
slender but strong, the very slender branches pendent, the young twigs com- 
monly rosy purplish; blades linear, thin, and lax; panicles small, numerous, 
short-exserted, or partly included. This species is more completely glabrous 
than any other of the genus in the West Indies. 
Shaded slopes, mostly at higher altitudes, Jamaica (Blue Mountains), Porto 
Rico (Quebradillas, Maricao, and Cayey), and St. Jan. Originally described 
from Jamaica, the type specimen collected at Cinchona by Delia Marble (no. 
222). In Jamaica the species is found in the Blue Mountains at an altitude 
of 1,000 to 1,500 meters; in Porto Rico at an altitude of about 800 meters. 
5. Lasiacis divaricata (L.) Hitche. Contr. U. 8S. Nat. Herb. 15: 16. 1910. 
Panicum divaricatum L, Syst. Nat. ed. 10. 2: 871. 1759. 
Panicum bambusoides Desv.; Hamilt. Prodr. Pl. Ind. Occ. 10. 1825. 
‘In Sagra, Hist. Cuba 11: 307. 1850. 
