162 
70. N. graminea, Del; One spec. from the East Indies 
labelled “WV. Indica, Cham.” The fruit is somewhat smaller than 
that of the original plant from Africa. 
CYMODOCEA4 is represented by Cymodocea and Halodule. 
71. Cymodocea equorea, Koenig. One spec. from India; 
_ another spec. so marked is doubtful. 
_ 72. C. manatorum, Asch, Spec. 1, Cuban coll. C. Wright, 
No. 3719. 
73. Halodule Wrightit, Asch. Wright's Cuban coll., 3720. 
By some Halodule is regardeg as only a sub-genus of Cymodocea. 
Neither has so far been found on our coast, but Cuba is so near 
that we may look for Halodule in our Southern waters. 
EXPLANATION OF PLATE LIX. 
Fig. 1. Side view of undenuded nutlet of Potamogeton 
Wrightit, Morong., x 12. 
Fig. 2. Nutlet split open, showing embryo, x 12. 
Fig. 3. Front view of nutlet, showing the lateral basal 
processes, X 12. 
Fig. 4. Nutlet, x 1%. 
Fig. 5. Leaf, natural size. 
Synopsis of the Genus Paspalum. 
By Dr. GEO. VASEY. 
SECTION ANASTROPHUS, BENTH. 
Spikelets rather distichous than secund, with the back of the 
flowering glume turned outwards or away from the rhachis. . 
1. P. platycaule, Poir—Culms very slender, 6-18 inches 
high from a creeping rhizoma, peduncle long exerted, terminated 
by a pair of spikes (1 to 2 inches long) or 3 or 4 approximate 
slender spikes, and frequently with several long-peduncled lateral 
ones; spikelets single, elliptical-oblong, acutish or obtuse, outer 
glumes little longer than the flower, generally only two-nerved ; 
leaves narrowly linear, smooth, obtuse, the sheaths much com- 
pressed. es 
2. P. Michauxianum, Kth. (P. Digitaria, Chap. non Poir.)— 
Larger and more robust; culms I to 2 feet high; leaves 3 to 6 
inches long, wide, obtuse, smooth or hairy; sheaths compressed ; 
spikes about 3, 2 to 4 inches long; spikelets rather distant, about 
