HITCHCOCK AND CHASE—TROPICAL NORTH AMERICAN PANICUM. 465 
TRUE PANICUM. 
GEMINATA. 
Medes" bearded ene sree ae seer an eee aris cette cee ete 7. P. barbinode. 
Nodes glabrous. 
Spikelets 3 mm. long; glumes and sterile lemma papery..... 6. P. paludivagum. 
Spikelets not over 2.4 mm. long; glumes and sterile lemma 
TG b PACE. aes © w)eleiaie in etainleinraie lalate tlm tea wre iniainie Sioa <= = === 5. P. geminatum. 
5. Panicum geminatum Forsk. 
Panicum geminatum Forsk. Fl. Aegypt. Arab. 18. 1775; Contr. U. S. Nat. Herb. 
15: 30. 1910. 
This species is described by Presl ! under the name Panicum brizoides L. (as well 
as under P. brizaeforme Presl). The Haenke specimen from Mexico is in the herb- 
arium of the National Museum at Prague. 
DISTRIBUTION. 
Moist ground, ditches and swamps, mostly near the coast, tropical regions of both 
hemispheres, in America extending north into southern Florida and Texas. Origi- 
nally described from Rosetta, Egypt. 
Lower Cauirornis: El Taste, Brandegce in 1893. San José del Cabo, Brandegee 
14, 36. 
Sonora: Yaqui River, Palmer 15 in 1869. Guaymas, Palmer 690 in 1887. Sierra 
de Alamos, Rose, Standley & Russell 12996. 
Srvatoa: Mazatlin, Rose, Standley & Russell 14109. 
Tamautipas: Tampico, Hitchcock 5796, Palmer 259 in 1910. 
Cotmma: Manzanillo, Hitchcock 7032. 
Veracruz: Veracruz, Hitchcock 6586. 
Gurrrero: Acapulco, Palmer 289 in 1894. 
YucatdAn: Izamal, Gaumer 1027. 
GUATEMALA: San José, Kellerman 
6250. 
Satvapor: Lake Ilopango, Hitch- 
cock 8920. 
Costa Rica: Bebedero, Jiménez 
734. 
Panama: Corozal, Pittier 2168, 
2170. Pedro Miguel, Hitch- 
cock 7956, Pittier 2509. Em- 
pire, Pittier 3714. Gatun, Fig. 15.—Distribution of P. geminatum. 
Hitchcock 7980. 
Banamas: Nassau, Curtiss 175. Fortune Island, Eggers 3992 (K. U. Herb.). 
Cusa: Habana, Leon 769, 918. Corrientes Bay, Britton & Cowell 9931. Santiagc 
de las Vegas, Hitchcock 143. Guanabacoa, Leédn 920. Guantinamo, Britton 
2281. Sancti Spiritus, Sergius 2789. Batabané, Hitchcock 142. Handbana, 
Wright 761. Palma Sola, Wright in 1860. 
Jamaica: Gordon Town, Haré 806. Ferry River, Harris 11352. Appleton, 
Hitchcock 9653. Palisadoes near Kingston, Hitchcock 9752. Black River, 
Hitchcock 9579. Savanna-la-Mar, Hitchcock 9877. 
1 Presl, Rel. Haenk. 1: 302. 1830. 
82472°—15——2 
