BOTANY OF THE MAYA AREA


 Spikelets pubescent ..._. ...-... _.__.. ___ _.... ...... 17. P. trichoides
 Culms tufted, sometimes decumbent at the base, but not
 widely spreading.
 Ligule prominent, 3 to 4 mm. long.
 Sheaths glabrous or appressed pubescent.
 Spikelets 12 mm. long -_ .24. P. longiligulatum
 Spikelets not more than 1 mm. long-._...._25. P. wrightianum
 Sheaths conspicuously pilose.
 Culms viscid below the nodes... .....31. P. viscidellum
 Culms not viscid-----... .......------..... ...--26. P. olivacenm
 Ligule less than 1 mm. long, sometimes nearly
 obsolete.
 Spikelets glabrous or nearly so.
 Blades cordate, 5 to 15 mm. wide .. ____ 27. P. sphrerocarpon
 Blades not cordate, usually less than 5 mm. wide.
 Spikelets 2 mm. long, strongly nerved, unsym-
 metrically pyriform ---.. ---..-... ..-.._--_-- -30. P. lancearium
 Spikelets 1.1 mm. long, not strongly nerved ... 29. P. chamselonche
 Spikelets pubescent.
 Blades papillose-ciliate; plants 10 to 20 cm. tall
 in soft dense tufts .......-._.. ..... .. 22. P. strigosnm
 Blades not papillose-ciliate ._ ..-- ..__ 28. P. albomarginatum

1. Panicum fasciculatum Swartz, Prodr. Veg. Ind. Occ. 22. 1788.
 Culms slender, branching, erect or decumbent at the base, 15 cm. to as
much as 1 m. long; blades 5 to 15 cm. long, 0.5 to 1.5 cm. wide, glabrous
or scaberulous; panicles 5 to 15 cm. long, the branches narrowly ascending
to spreading; spikelets 2.5 to 3 mm. long, dark brown, often tinged with
purple, glabrous, the second glume and sterile lemma reticulate-veined.
Moist cultivated ground and waste places, Florida, Texas and the West
Indies to Ecuador and Brazil.
 BRITISH HONDURAS. Corozal District: San Andres, Lundell 4729, 4956.
Santa Rita, Lundell 4848. Belize District: Manatee Lagoon, Peck 317.
Gracie Rock, Gentle 1582. El Cayo District: Roaring Creek, Lundell 315.
Stann Creek District: Middlesex, Schipp 374.
 GUATEMALA. Pet6n: Lake Pet6n, Lundell 3859.

2. Panicum reptans L. Syst. Nat. ed. 10. 2: 870. 1759.
 Annual; culms decumbent spreading, freely branching, the ascending
branches 10 to 30 cm. tall; blades flat, cordate, acuminate, 1.5 to 6 cm.
long, 4 to 12 mm. wide, the undulate white margins ciliate toward the
base; panicles 2 to 6 cm. long, the branches stiffly ascending or spreading,
2 to 3 mm. long; spikelets 2 mm. long, the first glume short, rounded or
truncate. Open ground and cultivated fields, tropical regions of both
hemispheres.
 GUATEMALA. Pet6n: El Paso, Lundell 1535.

3. Panicum purpurascens Raddi, Agrost. Bras. 47. 1823.
 Panicum barbinode Trin. M6m. Acad. St. Pktersb. VI. Sci. Nat. 1: 256. 1834.
 Culms coarse, as much as 6 m. long, decumbent at the base and rooting
at the lower nodes, geniculate, the nodes densely villous; sheaths papillose-
pilose; panicles 10 to 20 cm. long with several solitary or fascicled spreading
racemes; spikelets 3 mm. long, pointed, usually tinged with purple. Moist