HITCHCOCK AND CHASE—TROPICAL NORTH AMERICAN PANICUM. 499 
None of the specimens collected is mature. It may be that the large sterile palea 
becomes indurated at maturity as in P. hians and its close allies. The species is 
named in honor of Dr. F. L. Stevens of the University of Illinois, who, during the 
three years he was dean of the College of Agriculture and Mechanic Arts of Porto Rico, 
was an ardent student of the flora of the island and who contributed greatly to the 
success of a botanical trip made by one of the authors to Porto Rico in 1913. 
Since this work went to press a second collection of this species has been re- 
ceived: Wilson 9558, Laguna de Castellano, Cuba. 
56. Panicum exiguiflorum Griseb. 
Panicum exiguiflorum Griseb. Cat. Pl. Cub. 234. 1866; Contr. U. 8. Nat. Herb. 15: 
117, 1910. 
DISTRIBUTION. 
Savannas and moist sandy woods, Bahamas and Cuba. The type specimen from 
Cuba. 
Bauwamas: Fortune Island, Hitch- 
cock in 1890. 
Cusa: Handbana, Wright in 1865. 
Sancti Spiritus, Sergius 2566. 
Obispo Hill, Leén902b. Zaza 
del Medio, Leén 902. Guana- 
bacoa, Leén 911, 913. Chiri- 
gote, Wright3450. Herradura, 
Hitchcock 179, Tracy 9075. Isle 
of Pines, Taylor 35. Without 
locality, Wright 755, 3450, 3877. 
Fig. 78.—Distribution of P. exiguiflorum. 
57. Panicum hians Ell. 
Panicum hians Ell. Bot. 8. C. & Ga. 1: 
118, 1816; Contr. U. 8. Nat. Herb. 15: 118, 
1910. 
DISTRIBUTION. 
Savannas and moist soil along ponds and 
streams, North Carolina to New Mexico and 
in Veracruz, Mexico. The type specimen 
from South Carolina. 
Veracruz: Jalapa, Schiede. Without 
Fig. 79.—Distribution of P, hians. locality, Miller 2095. 
58. Panicum cupreum Hitche. & Chase. 
Panicum cupreum Hitche. & Chase, Contr. 
U. 8. Nat. Herb. 15: 120. 1910. 
DISTRIBUTION. 
Only known from the type collection, in 
‘“‘wet hollows in prairies of Flor de Maria, 
State of Mexico,’”’ Pringle 3449. 
F id. 80.—Distribution of P. cupreum. 
