BOTANY OF THE MAYA AREA


at the tip; first glume rounded, about 1 mm. long. Marshes and wet
savannas, Mexico, Cuba, and Trinidad to Brazil and Bolivia.
 BRITISH HONDURAS. Belize District: Belize, Bartlett 11253. Maskall Pine
 Ridge, Gentle 1043. Toledo District: Ycacos Lagoon, Peck 901.
 37. HYMENACHNE Beauv.
 1. Hymenachne amplexicanlis (Rudge) Nees, Agrost. Bras. 276. 1S29.
 Perennial; culms coarse, succulent, sparingly branched, often geniculate
 and rooting at the lower nodes; blades flat, cordate, 10 to 30 cm. long,
 1 to 2.5 cm. wide, the margins scabrous; panicle dense and spikelike, 15 to
 30 cm. long, 1 to 2 cm. thick, interrupted below; spikelets acuminate, 3 to
 4 mm. long, the first glume 1.5 mm. long, acute, the second glume and
 sterile lemma more or less pilose toward the tip. Margins of rivers and
 swamps, tropics of both hemispheres.
 BRITISH HONDURAS. Belize District: Little Cocquericot, Lundell 3869.
 El Cayo District: El Cayo, Bartlett 11456. Stann Creek District: Middle-
 sex, Schipp 890.
 38. HOMOLEPIS Chase
1. Homolepis aturensis (H.B.K.) Chase, Proc. Biol. Soc. Washington 24: 146. 1911.
 Perennial; culms widely straggling, rooting at the lower nodes, glabrous;
sheaths keeled, usually overlapping, the margins ciliate; blades flat, acumi-
nate, cordate, 8 to 15 cm. long, 8 to 15 mm. wide, glabrous or sparsely
pilose, the margins often ciliate at the base; panicles 5 to 10 cm. long,
the few-flowered branches narrowly ascending or appressed; spikelets 6 to
7 mm. long, acuminate, glabrous, the first and second glume equal, cover-
ing the sterile and fertile lemmas. Woods, thickets and moist open ground,
Mexico to Brazil and Bolivia.
 BmRisn HONDxUAS. Belize District: Manatee Lagoon, Peck 45. Gracie
Rock, Gentle 1588, 1629. El Cayo District: Little Cocquericot, Lundell
3878. Stann Creek District: Middlesex, Smart 30. Stann Creek, Schipp
896. Toledo District: Temash River, Smart 54; Schipp 1373.
 39. ISACHNE R. Br.
1. Isachne polygonoides (Lam.) Doell in Mart. Fl. Bras. 2?: 273. 1877.
 Annual; culms long creeping, branching, rooting at the nodes, the flower-
ing shoots 20 to 30 cm. tall; sheaths 1 to 1.4 cm. long, much shorter than the
internodes, spreading-hispid; blades cordate, spreading, 3 to 5 cm. long,
1 to 1.5 cm. wide, very scabious; panicles about 5 cm. long, included at the
base; spikelets about 1.8 mm. long, glabrous; lower floret staminate, gla-
brous, resembling the glume in texture; upper floret, fertile, indurate, white,
pubescent. Swamps and wet savannas, British Honduras and the West
Indies to Brazil.
 BmRITIS HONDURAS. Stann Creek District: All Pines, Schipp 777.
 40. OPLISMENUS Beauv.
Plants annual; spikelets densely appressed-pilose ._..__........_... 1. 0. bnrmanni
Plants perennial; spikelets glabrous, or only sparsely short-pilose ... 2. 0. hirtellus

1. Oplismenus burmanni (Retz.) Beauv. Ess. Agrost. 54. 1812.
 Annual; culms slender, creeping, rooting at the nodes, mostly 30 to 50 cm.
long; sheaths much shorter than the internodes, spreading-pilose; blades