A'T6 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
DISTRIBUTION. 
In water of ponds at high altitudes, south- 
ern Mexico. 
Jatisco: Orozco, Hitchcock 7379. 
Mexico: Near Mexico City, Orcutt 
4269, Pringle 6322, 9577, Bourgeau 
529. 
REPUBLIC OF Mexico: Without locality, 
Schaffner 525 
Fic. 31.— Distribution of P. sucosum. 
19. Panicum elephantipes Nees. 
Panicum elephantipes Neesy Agrost. Bras. 165. 1829; Contr. U. 8. Nat. Herb. 15: 
53. 1910. l2tnG ren Peek ROG. ASA 
Field study has shown that this species is perennial. 
DISTRIBUTION. 
In ponds and shallow weter at low altitudes, West Indies and Guatemala, south 
to Argentina. The type specimen from Brazil. 
GUATEMALA: Nearmouth of Rio Pol_ 
ochic, Alta Verapaz, Goll 35A. 
Cusa: San Antonio, Hitchcock 152. 
Almendares River, Leén 335. 
Jamaica: Middle Quarters, on 
Black River, Amer. Gr. Nat. 
Herb. 19. Savanna-la-Mar, 
Hitchcock 9878. 
Porto Rico: Between Catafio and 
Bayamon, Chase 6407. Dor- 
ado, Chase 6415. Fajardo, Sin- Fig. 32.—Distribution of P. elephantipes. 
tenis 938. 
CAPILLARIA. 
Panicles, more or.less droopiniec. 236 sete ease ae See 25. P. sonorum. ~ 
Panicles erect. 
Inflorescence elongated, composed of several approximate, 
implicate panicles. fu... <s2sg8.- sce h saee ee Se eo eT 
Inflorescence not composed of approximate nor implicate 
panicles. 
Panicles more than half the length of the entire plant.. 20. P. capillare. — 
Panicles not more than one-third the entire height of 
the plant. 
First glume about one-third the length of the 
spikelets, subacute or blunt...............-- 24. P. stramineum. — 
First glume usually more than half the length of 
the spikelet, acuminate. 
Spikelets 4.5 to 6 mm. long. 
Spikelets 6 mm. long, scattered.........--- 26. P. parcum. 
Spikelets scarcely over 5 mm. long, 
approximates: | 45525 eee eee 23. P. decolorans. 
Spikelets not over 4 mm. long. 
First glume more than three-fourths the 
length of the spikelet; spikelets 4 
mm. long). ss sea eee ee eee 22. P. pampinosum. — 
First glume half to two-thirds the length 
of the spikelet; spikelets not over 3.3 
bOI E ERO) OT ea Hone kere a ere ape 21. P. hirticaule. 
