HITCHCOCK Al^D CHASE TROPICAL NORTH AMERICAIST PANICUM. 467 



Panama: El Boquete, Hitchcock 8266. Gatun Lake, Pittier 2559, Hitchcock 8031^. 

 Pedro Miguel, Hitchcock 7931. Chepo, Pittier 4734. Culebra, Pittier 4807. 



Baha.mas: Nassau, Curtiss 115. 



Cuba: Near Habana, Leon 568. Camaguey, Shafer 2881. Romelie, Eggers 4870. 

 Cienfuegos, Pringle 26. Almendarea River, Leon 283. Without locality, 

 Wright 1545. 



Jamaica: Hope Gardens, Harris 11254, 10930. Mount Hybla, Harris 11565. 

 Newcastle, Hitchcock 9339. Black River, Hitchcock 9580. Montego Bay, 

 Hitchcock 9693. 



Porto Rico: Bayamon, Hioram 

 360, Millspaugh 324, Heller 

 100. Aibonito, Goll 613, 

 Playa de Fajardo, Chase 6657. 

 Guanica, Chase 6528, Mills- 

 paugh 727. Yauco, Heller 

 6293. Los Mameyes, Eggers 

 1328. Vieques, CTose 6679. 

 Mona, jBess 450. 



Danish West Indies: St. Croix, 

 Ricksecker 300. 



Leeward Islands: Guadeloupe, 

 1030 (K. U. Herb.). 



Windward Islands: Martinique, Buss 539. Grenada, Buckmire 1423, Broad- 

 way in 1904 and in 1905. St. Vincent, Eggers 6834 (K. U. Herb.). Barba- 

 dos, Eggers 7079 (K. U. Herb.). 



Trinidad: Port of Spain, Hitchcock 9941, 10044. 



Tobago: Scarborough, Hitchcock 10204. 



Curasao: Santa Cruz, Britton & Shafer 3012. 



Colombia: Cartagena, Hitchcock 9901. Santa Marta, Smith 211. 

 locality, Lehmann 5744. 



Fig. 17.— Distribution of P. barbinode. 



Duss 2689, L'Herminier. Dominica, Eggers 



Without 



FASCICULATA. 



Spikelets 5 to 6 mm. long 13. P. texanwn. 



Spikelets 2 to 4 mm. long. 



Spikelets strongly reticulate-veined, 2 to 3 mm. long; glabrous. 

 Panicle branches long and spreading ; blades pubescent or 



glabrous 9. P.fasdculatum. 



Panicle branches short, appressed; blades narrow, pubes- 

 cent 9a. P. fasciculatum 



reticulatum. 

 Spikelets scarcely reticulate-veined or only near the apex. 



Spikelets not over 2 mm. long, glabrous 8. P. reptans. 



Spikelets over 3 mm. long, pubescent. 



Rachis scabrous but not bristly 11. P. adspersum. 



Rachis pilose with bristly hairs. 



Plant more or less velvety; sheaths not papillose. 10. P. molle. 

 Plant not velvety; sheaths papillose 12. P. arizonicum. 



8. Panicum reptans L. 



Panicum reptans L. Syst. Nat.ed. 10. 2: 870. 1759; Contr. U. S. Nat. Herb. 15: 36. 

 1910 



distribution. 



Open ground at low altitudes especially near the coast, frequently a weed in waste 

 places and cultivated soil. Gulf Coast of the United States and Atlantic slope of 



