HITCHCOCK AND CHASE—TROPICAL NORTH AMERICAN PANICUM. 467 
Panami: El Boquete, Hitchcock 8266. Gatun Lake, Pittier 2559, Hitchcock 8031}. 
Pedro Miguel, Hitchcock 7931. Chepo, Pittier 4734. Culebra, Pittier 4807. 
Banamas: Nassau, Curtiss 115. 7 
Cua: Near Habana, Leén 568. Camaguey, Shafer 2881. Romelie, Eggers 4870. 
Cienfuegos, Pringle 26. Almendares River, Leén 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 OT Tr a 
360, Millspaugh 324, Heller _~ htt 
100. <Aibonito, Goll 613. a -, 
Playa de Fajardo, Chase 6657. \ Ms? wae 
Guanica, Chase 6528, Mills. eg PES ey 
paugh 727. Yauco, Heller AT fl * 
6293. Los Mameyes, Eggers Ne ee, 
1328. Vieques, Chase 6679. a i 
Mona, Hess 450. { 
DanisH West Inp1ks: St. Croix, Fia. 17.—Distribution of P. barbinode. 
Ricksecker 300. 
Leewarp Istanps: Guadeloupe, Duss 2689, L’Herminier. Dominica, Eggers 
1030 (K. U. Herb.). 
Winpwarp IstaNps: Martinique, Duss 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.). 
TrinipAD: Port of Spain, Hitchcock 9941, 10044. 
Toxsaco: Scarborough, Hitchcock 10204. 
Curacao: Santa Cruz, Britton & Shafer 3012. 
Cotomsta: Cartagena, Hitchcock 9901. Santa Marta, Smith 211. Without 
locality, Lehmann 5744. 
FASCICULATA. 
Spikelets 5 to 6 mm, long...........---------- 22 ee eee eee eee eee 13. P. texanum. 
Spikelets 2 to 4 mm. long. 
Spikelets strongly reticulate-veined, 2 to3 mm. long; glabrous. 
Panicle branches long and spreading; blades pubescent or 
glabrous.......---------+---- +--+ 220 -e ee eee eee 9. P. fasciculatum. 
Panicle branches short, appressed ; blades narrow, pubes- 
CONG. 0... eee eee ee eee eee eee eens 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 .........--.-------- ll. 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. 8. 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 
