476 



CONTRIBUTIONS FROM THE NATIONAL HEEBAEIUM. 



Fig. 31. — Distribution of P, sucosum. 



DISTEIBXJTION. 



In water of ponds at Mglx altitudes, south- 

 ern Mexico. 



Jalisco: Orozco, Hitdicock 7379. 

 M:6xico: Near Mexico City, Orcutt 



42m, Pringle 6322, 9577, Bourgeau 



529. 

 Republic of Mexico : Without locality, 



Schaffner 525 



19. Panicura elephantipes Nees. 

 Panicum elephantipes Nees,i Agrost. Bras. 105.^1829; Contr 



U. S. Nat. 



Herb. 15: 



Fig. 32.— Distribution of P. elephantipes. 



53.1910. ""' /•-'7'«-«-^(^^z>i&*«i u^tt^ x<?6 



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: Near mouth of Rio Pol. 



ochic, Alta Verapaz, Goll 35A. 

 Cuba: San Antonio, Hitchcock 152. 



Almendares River, Leon 335. 

 Jamaica: Middle Quarters, on 



Black River, Amer. Gr. Nat. 



Herb. 19. Savaima-la-Mar, 



Hitchcock 9878. 

 Porto Rico: Between Catano and 



Bayamon, Chase 6407. Dor- 

 ado, Chase 6415. Fajardo, Sin- 



tenis 938. 



CAPILLARIA. 



Panicles more or less drooping 25. P. sonorum. "^ 



Panicles erect. 



Inflorescence elongated, composed of several approximate, 



implicate panicles 27. P. 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 26. P. parcum. 



Spikelets scarcely over 5 mm. long, 



approximate 23. P. decolorans. 



Spikelets not over 4 mm. long. 



First glume more than three-fourths the 

 length of the spikelet; spikelets 4 



mm. long 22. P. pampinosum. - 



First glume half to two-thirds the length 

 of the spikelet; spikelets not over 3.3 

 mm. long 21. P. hirticaule. 



