476 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
DISTRIBUTION. 
In water of ponds at high altitudes, south- 
ern Mexico. 
Jauisco: Orozco, Hitchcock 7379. 
México: Near Mexico City, Orcutt 
4269, Pringle 6322, 9577, Bourgeau 
529. 
ReEpus1ic oF Mexico: Without locality, 
Schaffner 525 
Fig. 31.—Distribution of P. sucosum. 
19. Panicum elephantipes Nees. 
Panicum elephantipes Nees, Agrost. Bras. 165. 1829; Contr. U. 8. Nat. Herb. 15: 
53. 1910. 
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: Nearmouthof Rfo Pol_ 
ochic, Alta Verapaz, Goll 35A. 
Cusa: San Antonio, Hitchcock 152. 
Almendares River, Ledn 335. 
Jamaica: Middle Quarters, on 
Black River, Amer. Gr. Nat. 
Herb. 19.  Savanna-la-Mar, 
Mitchcock 9878. 
Porto Rico: Between Catafio and 
Bayamon, Chase 6407. Dor- 
ado, Chase 6415. Fajardo, Sin- Fia, 32.—Distribution of P. elephantipes. 
tenis 938. 
CAPILLARIA,. 
Panicles more or less drooping................--2---2-2-2-22.2. 25. P. sonorum. 
Panicles erect. 
Inflorescence elongated, composed of several approximate, 
implicate panicles...........2....0000..0202200-02022. 27. Pz cayennense. 
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.....- eee 26. P. parcum. 
Spikelets scarcely over 5 mm. long, 
approximate........2...2......0... 23. P. decolorans. 
Spikelets not over 4 mm. long. 
First glume more than three-fourths the 
length of the spikelet; spikelets 4 
mm. long ...............0.2.02202. 22. P. pampinosum. 
First glume half to two-thirds the length 
of the spikelet; spikelets not over 3.3 
mm. long........................... 21. P. hirticaule. 
