474 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Cusa: Herradura, Tracy 9055, 9342, Britton & Earle 6566. Ariguanabo, Leén 19753, 
2774,2775. Santiago de las Vegas, Hitchcock 151. Batabano, Hitchcock 150. 
LeEwarp Istanps: Guadeloupe, Duss 3178. 
16. Panicum bartowense Scribn. & Merr. 
Panicum bartowense Scribn. & Merr. U. 8. Dept. Agr. Div. Agrost. Cire. 35: 3. 1901; 
Contr. U. 8. Nat. Herb. 15: 52. 1910. 
DISTRIBUTION. 
Low ground, often growing in shallow 
water, Florida, Bahamas, Cuba, and 
Jamaica. The type specimen from 
Bartow, Florida. 
Banamas: Great Bahama, Britton 
& Millspaugh 2706. North 
Bimini, Brace 3467 (Field Mus. 
Herb.). 
Fia. 27.—Distribution of P. bartowense. Cusa: Batabandé, Hitchcock 149. 
Without locality, Wright 3860. 
Jamaica: Black River, Amer. Gr. Nat. IHerb. 18. 
17. Panicum aquaticum Poir. 
Panicum aquaticum Poir. in Lam. Encycl. Suppl. 4: 281. 1816. ‘‘Cette plante croft 
& Porto-Ricco; elle m’a été comuniquée par M. Ledru.’’ The type is in the Cosson 
Herbarium. In the Revision! this species was included in P. dichotomiflorum Michx. 
Subsequent field study has shown it to be a perennial. 
Panicum chloroticum sylvestre Nees; Trin. Gram. Pan. 236. 1826; Contr. U. 8. Nat. 
Herb. 15: 48, 1910. 
Panicum hygrophilum Salzm.; Steud. Syn. Pl. Glum. 1: 71. 1854; Contr. U. S. Nat. 
Herb. 15: 49. 1910. 
Panicum proliferum strictum Griseb, Cat. Pl. Cub. 232. 1866; Contr. U. 8. Nat. Herb. 
15: 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. dichotomiflorum; 
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 surface toward the base; 
panicles terminal and axillary, short-exserted or in- 
cluded at base, averaging smaller than those of P. 
dichotomiflorum, rarely 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 pointed 
than in that species. 
Herbarium specimens lacking basal parts are difficult to distinguish from P. 
dichotomiflorum. 
Fig. 28.—P. aquaticum.. From 
type specimen, 
1 Contr. U. 8. Nat. Herb. 15: 48. 1910. 
