BOTANY OF THE MAYA AREA


4 to 5 cm. long, the branches spreading, the axils densely pubescent or
pilose; spikelets 2 nim. long, pubescent; autumnal phase freely branching,
decumbent-spreading, the blades and panicles reduced. Fields, dry open
ground, and open woods, Mexico to Colombia.
 BIrrTSH HONDURAS. El Cayo District: Mountain Pine Ridge, Bartlett
11621.

27. Panicum spharocarpon Ell. Bot. S. C. & Ga. 1: 125. 1816.
 Perennial; culms densely tufted, erect or somewhat spreading, 15 to as
much as 50 cm. tall; ligule obsolete or nearly so; blades cordate, light green,
4 to 10 cm. long (rarely longer), 5 to 15 mm. wide, the white cartilaginous
margins papillose-ciliate toward the base; panicles mostly 5 to 10 cm. long,
loosely flowered, the axis, branches, and pedicels viscid; spikelets sub-
spherical, 1.7 mm. long, pubescent. Autumnal phase sparingly branched,
spreading, the blades and panicles not greatly reduced. Sandy or gravelly
banks, roadsides, and open woods, eastern United States, Cuba, and Mexico
to Venezuela.
 BRITISH HONDURAS. Belize District: Manatee Lagoon, Peck 61. El Cayo
District: Mountain Pine Ridge, Bartlett 11714a.

28. Panicum albomarginatnm Nash. Bull. Torrey Club 24: 40. 1897.
 Perennial; culms slender, erect, wiry, mostly 30 to 40 cm. tall; blades
4 to 6 cm. (rarely 8 cm.) long, 4 to 6 mm. wide, glabrous or nearly so, the
conspicuous white cartilaginous margins scabrous; ligule less than 1 mm.
long; panicles usually about 4 cm. long; spikelets 1.5 mm. long, pubescent.
Autumnal phase bushy branched with reduced blades and panicles. Sandy
woos, southeastern United States, British Honduras, Guatemala, and Cuba.
 BRITISH HONDURAS. El Cayo District: Mountain Pine Ridge, Bartlett
 11591, 11602, 11613, 11632, 11782.

 29. Panicum chamelonche Trin. Gram. Pan. 242. 1826.
 Perennial; culms densely tufted, erect or ascending, 15 to 20 or 30 cm.
 tall, glabrous; ligule very short; blades 3 to 5 cm. long, 2 to 3 mm. wide,
 often involute pointed; panicles usually about 3 cm. long, the axis and
 stiffly widely spreading branches flexuous; spikelets 1.1 mm. long, long
 pedicellate. Autumnal phase freely branching, forming dense cushions,
 the blades becoming involute. Open sandy land, southeastern United States,
 Cuba and British Honduras.
 BRITISH HoNDURAS. Belize District: Belize, Bartlett 11236. Gracie
 Rock Pine Ridge, Gentle 1556.

 30. Panicum lancearium Trin. Gram. Pan. 223. 1826.
 Perennial; culms densely tufted, erect, purplish, minutely puberulent;
 blades mostly 4 to 6 cm. long, 4 to 5 mm. wide, the white cartilaginous mar-
 gins scabrous; panicles 3 to 6 cm. long; spikelets asymmetrically pyriform,
 pubescent or glabrous; first glume obtuse, clasping, smooth and shining.
 Autumnal phase freely branching from the upper nodes, the branches, pani-
 cles and blades crowded, much reduced. Sandy pine woods, southeastern
 United States, British Honduras, Cuba, and Dominican Republic.
 BRITISH HONDURAS. Belize District: Belize, Bartlett 11225. Sibun River,
 Peck 425.