474 



COISTTRIBUTIONS FEOM THE NATIONAL HEEBARIUM. 



Cuba: Herradura, Tracy 9055, 9342, Britton & Earle 6566. Ariguanabo, Leon 1975|, 

 2774, 2775. Santiago de las Vegas, Hitchcock 151. Batabano, HitchcocJc 150. 

 Leeward Islands: Guadeloupe, Duss 3178. 



16. Panicum bartowense Scribn. & Merr. 



Panicum bartowense Scribn. & Merr. U. S. Dept. Agr. Div. Agrost. Circ. 35: 3. 1901; 

 Contr. U. S. Nat. Herb. 16: 52. 1910. 



DISTRIBUTION. 



%jr^/ 



it 



v, 1 ■<1 





/^ 





^vi;;v^ 



^i 



V 





-^ 



^L^^/f^^ 



Fig. 27.— Distribution of P. bartowense. 



Jamaica: Black River, Amer. Gr. Nat. 



Low ground, often growing in shallow 

 water, Florida, Bahamas, Cuba, and 

 Jamaica. The type specimen from 

 Bartow, Florida. 



Bahamas: Great Bahama, Britton 

 & Millspaugh 2706. North 

 Bimird, Brace 3467 (Field Mus. 

 Herb.). 



Cuba: Batabano, Hitchcock 149. 

 Without locality, Wright 3860. 

 Herb. 18. 



17. Panicmn aquaticiim Poir. 



Panicum aqiuiticum Poir. in Lam. Encycl. Suppl. 4: 281. 1816. "Cette plantecrott 

 k Porto-Ricco; elle m'a 6t6 comuniquee par M. Ledru." The type is in the Cosson 

 Herbarium. In the Revision^ this species was included in P. dichotomiflorum Alichx. 

 Subsequent field study has shown it to be a perennial. 



Panicum chloroticum sylvestre Nees; Trin. Gram. Pan. 236. 1826; Contr. U. S. Nat. 

 Herb. 15:48.1910. 



Panicum hygrophilum Salzm.; Steud. Syn. PI. Glum. 1: 71. 1854; Contr. U. S. Nat. 

 Herb. 15: 49. 1910. 



Panicum proliferumstrictum Griseh. Cat. PL Cub. 232. 1866; Contr. U. S. Nat. Herb. 

 16: 49. 1910. 



DESCRIPTION. 



Plants perennial, mostly aquatic, glabrous except as noted ; culms usually decumbent 

 at base, rooting at the nodes, erect branches often arising therefrom, the flowering 

 culms erect, simple or sparingly branching, averaging 

 lower and more slender than in P. dichotomifioi-um; 

 sheaths usually overlapping, rarely pilose at the junc- 

 tion with the blade; ligule a ring of hairs about 1 mm. 

 long; blades commonly elongated, as much as 25 cm. 

 long, but sometimes 5 to 10 cm. long and abruptly 

 pointed, 5 to 10 mm. wide, linear, acute, occasionally 

 sparsely pilose on the upper sm-face toward the base; 

 panicles terminal and axillary, short-exserted or in- 

 cluded at base, averaging smaller than those of P. 

 dichotomiflorum, rai'ely as much as 20 cm. long, less 

 freely branching and fewer flowered, the branchlets 

 and pedicels smooth or nearly so on the angles; spike- 

 lets 3 to 3.4 mm. long, 1 mm. wide, more gradually 

 pointed than those of P. dichotomiflorum, the fruit slightly larger and more iDointed 

 than in that species. 



Herbarium specimens lacking basal parts are difficult to distinguish fi'om P. 

 dichotomiflorum . 



Fig. 28.— p. aquaUcum. From 

 type specimen. 



1 Contr. U. S. Nat. Herb. 15: 48. 1910. 



