BOTANICAL GAZETTE. 55 
One terminal, and usually a second approximate spike, with 
remote lateral peduncled ones. 
6. , Michx. and varieties. 
Spikes 2 to 5, or rarely 7, approximate or the lower ones 
rather distant. ; 
- racemulosum, Nutt. 
8. P. leve, Michx 
0..¢P. 
P. giganteum, Baldw. ined. 
. P. livid in. 
- P. dilatatum, Poir. (P. ovatum, Trin.) 
. P. elatum, Richard in Herb. Paris. 
4 
5 res]. 
P. lentiferum, Lam. (P. precox, Walt.) 
8 
é 
£ ™m 
20. P. purpurascens, Elliott. 
21. P. plicatulum, Michx. (P. undulatum, Poir.) | 
Subsection Pseudoceresia, Benth. (Ceresia, Elliott.) Empty 
or outer glumes, 2. Spikes numerous, spreading, the rhachis more 
or less dilated, concave, thin and green: the spikelets small and 
smooth 
oUn, 
22, P. flwitans, Kunth. (Ceresia fluitans, Ell.) 
Section ANAstRopHus, Benth. Spikelets on each side of the 
rhachis of the narrow subflexuous spike, sessile, alternate, mostly 
in two rows, the lower empty glume and the flowering one turned 
away from the rhachis (Spicule inverse, Nees): the spikes often 
many, close, suberect. 
- P. platycaule, Poir. (P. compressum, Nees.) 
24, P. Digitaria, Poir? Chapman’s Flora. 
NorEs.—No, 1, collected by Dr. Garber, at Miami, Florida. 
The culm is much stouter and the spike much longer than in the 
typical plant. 
_Nos. 4 and 5. There is much confusion respecting these spe- 
cles if they are separate. Mr. Bentham makes them synony- 
mous, but there certainly appear to be two species. The P. vagi- 
natum, Swz., has prostrate or decumbent culms, growing in water 
or marshy a and very acute glumes. The other species has 
running rhizome with erect culms, shorter and broader leaves, 
and ly acute glumes. : 
No. 6. It is difficult to separate P. debile and P. ciliatifolium, 
at least as species. They appear to be only varieties. 
No. 10 includes P. Blodgettii, Chapm. 
