THE GRASSES OF BRITISH HONDURAS AND THE PETEN, GUATEMALA 157

 21. LEERSIA Swartz
Panicles open, the long branches naked below; spikelets 2 mm. long- ..1. L. grandiflora
Panicles narrow, contracted, the short branches spikelet bearing nearly
 to the base; spikelets 3 mm. long -___---. ...--....- .........--- 2. L. hexandra

1. Leersia grandiflora (Doell) Prodoehl, Bot. Archiv Mez 1: 219. 1922.
 Perennial; culms rather slender, erect, 1 to 2 m. tall; blades flat, 15 to
30 cm. long, 1 to 1.5 cm. wide (rarely as much as 2 cm.), scabrous, some-
times sparsely appressed hispid; panicles large and open, the slender droop-
ing branches as much as 15 cm. long, spikelet-bearing toward the ends;
spikelets 2 mm. long, sparsely hispid-scabrous. Shady banks and borders
of streams, Mexico to Brazil.
 BRITISH HONDURAS. El Cayo District: El Cayo, Bartlett 11450.

2. Leersia hexandra Swarts, Prodr. Veg. Ind. Occ. 21. 1788.
 Perennial; culms slender, erect from a decumbent, creeping base, rooting
at the lower nodes, 0.5 to more than 1 m. tall; blades flat, 10 to 20 cm. long,
about 4 to 8 mm. wide, scabrous; panicles 8 to 12 cm. long, often tinged
with purple, the branches narrowly ascending, spikelet-bearing to the base
or nearly so; spikelets 3 mm. long; hispid. Swamps, wet ditches, and
margins of rivers and lakes, southern United States and the West Indies
to Argentina.
 BRITISH HONDURAs. Stann Creek District: Middlesex, Schipp 912.
 GUATEMALA. Pet6n: La Libertad, Aguilar 168. Lake Pethn, Dampf 11.

 22. PHARUS L.
Culms erect; fruit pubescent only at the summit...-.. --............--.1. P. latifolius
Culms decumbent at the base, rooting at the lower nodes; fruit pu-
 bescent all over_..-. ......- -- .... ..-......-- .._. _....... 2. P. parvifolius

1. Pharus latifolius L. Syst. Nat. ed. 10. 2: 1269. 1759. JAx PLANT.
 Perennial; culms erect, glabrous, 40 to 80 cm. tall; blades lanceolate,
acuminate, narrowed to a petiolate base, 10 to 30 cm. long, 3.5 to 7 cm.
wide, strongly reticulate veined; panicle 10 to 30 cm. long, the main axis
terminating in a stout bristle 1 to 6 cm. long; branches usually 2 or 3,
compound, stiffly spreading, disarticulating at maturity; pistillate spikelets
about 1.5 cm. long, appressed, the fruit pubescent only toward the summit.
Wet forests, British Honduras and the West Indies to Brazil.
 BRITISH HONDURAS. Belize District: Prospecto-Maskall road, Gentle 890.

2. Pharus parvifolius Nash, Bull. Torrey Club 35: 301. 1908.
 Perennial; culms decumbent at the base, rooting at the lower nodes,
about 1 m. long; blades lanceolate, mostly 15 to 20 cm. long, 1.5 to 3 cm.
wide; panicle 15 to 25 cm. long, similar to that of P. latifolius; pistillate
spikelets 11 mm. long, the fruit plump, pubescent all over. Wet forests,
Mexico and the West Indies to Brazil.
 GUATEMALA. Pet6n: Yaxha-Remate road, Lundell 2014.

 23. ARUNDINELLA Raddi
Sheaths hispid; blades 1 to 2 cm. wide... ...._ .. __........ 1. A. deppeana
Sheaths glabrous; blades 2 to 4 mm. wide_...... ..-..__---.........2. A. berteroniana