HITCHCOCK AND CHASE GRASSES OP THE WEST INDIES. 307 



obovate, obscurely papillose-roughened, the very tip bearing a few minute thick 

 hairs. 



Type in the U. S. National Herbarium, no. 694431, collected In the water of 

 a small pool, Troy, Jamaica, November 6, 1912, by A. S. Hitchcock (no. 9795). 



Paspalum serratum is most nearly related to P. dissectum, from which it 

 differs in its sparingly branching habit, less leafy culms, and larger pointed 

 spikelets. Known only from the type collection and from a fragmentary speci- 

 men in the Grisebach Herbarium, collected by Alexander Prior in Jamaica. 



3. Paspalum repens Berg. Act. Helv. Phys. Math. 7: 129. pi. 7. 1772. 

 Ceresla fluitans Ell. Bot. S. C. & Ga. 1: 109. 1816. 



Paspalum fluitans Kunth, Rev. Gram. 1: 24. 1829. 



An aquatic or subaquatic perennial, with submerged stems and floating 

 branches buoyed up by the inflated sheaths, with thin flat blades and with 

 panicles of numerous spreading racemes, the small flat elliptic whitish spikelets 

 in 2 rows on the broad green rachls. 



In sluggish streams or standing water, southeastern United States to Para- 

 guay. Originally described from Dutch Guiana ; Ccresia fluitans described from 

 Georgia. 



Western Jamaica and Trinidad (Caroni Savanna). 



Paspalum kacemosum Lam.^ (P. stoloniferum Bosc).' A South Ameri- 

 can creeping perennial with tawny or ferruginous panicles of numerous short 

 racemes, the spikelets with deeply fluted glume and sterile lemma, cultivated 

 8S an ornamental in the Tropics, sometimes escaped. Collected in Habana- 

 Vedado, Ledn 759. 



4. Paspalum heterotrichon Trin. Gram. Icon. 3: pi. 285. 1831. 



Paspalum heterotrichon var. paucispicatum Hack. Notizbl. Bot. Gart. Berlin 

 1: 328. 1897. 



A tall very slender wiry perennial leaning upon or clambering among other 

 vegetation, branching above, the narrow spreading blades becoming involute, 

 the few racemes with a broad golden yellow membranaceous rachis and silvery 

 silky spikelets. 



Open grassy slopes and savannas, at moderate altitudes, Panama to Brazil, 

 whence originally described, and in Haiti, the type locality of the variety. 



5. Paspalum vaginatum Swartz, Prodr. Veg. Ind. Occ. 21. 1788. 

 Digitaria foliosa Lag. Gen. & Sp. Nov. 4. 1816. 



Paspalum brachiatum Trin. ; Nees, Agrost. Bras. 62. 1829. 



Paspalum foliosum Kunth, Rev. Gram. 1: 25. 1829 



Paspalum inflatum A. Rich, in Sagra, Hist. Cuba 11: 298, 1850. 



Paspalum distichum var. vaginatum Swartz ; Griseb. Fl. Brit. W. Ind. 541. 

 1864. 



Sanguinaria vaginata Bubani, Fl. Pyren. 4: 258. 1901. 



An extensively creeping perennial with loose sheaths and spreading involute- 

 margined blades 2 to 6 mm. wide, tapering from base to apex, the sterile run- 

 ners often stout with closely imbricate leaves, the flowering branches ascend- 

 ing, commonly 20 to 30 cm. tall, with a pair of divergent racemes (rarely 3) at 

 the apex, the flat acuminate spikelets usually 3 to 4 mm. long. 



Sea coasts and brackish sands, Gulf Coast and the West Indies to South 

 America. Originally described from Jamaica ; Digitaria foliosa and Paspalum 



'Tabl. Encycl. 1: 176. 1791. 

 "Trans. Linn. Soc. 2: 83. pi. 16. 1794. 



