200 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. | 
Spikelets not transversely wrinkled. 
Pubescence glandular. .................. 5. P. clavuliferum. 
Pubescence if present not glandular. 
Spikelets about 1 mm. long...,......29. P. rupestre. 
Spikelets 2 to 3 mm. long. 
Blades short, 10 cm. long, villous. .28. P. rottboellioides. 
Blades elongated 30 to 50 cm. 
long, glabrous.........22....... lL. P. alterniflorum. 
Racemes more than 1, often numerous. 
First glume present.................2.......-. 4. P. ciliiferum. 
First glume obsolete. 
Sterile lemma transversely wrinkled: 
spikelets brown. 
Spikelets obovate....................24. P. plicatulum. 
Spikelets elliptical... .. 2.2.0.0... ll. P. elatum. 
Sterile lemma not transversely wrinkled. 
Racemes few, mostly 2 to 4, 
Spikelets flattened...............16. P. lividum. 
Spikelets distinctly convex. 
Spikelets pubescent. 
Pubescence glandular... 2. P. arenarium. 
Pubescence not glandu- 
| 2 caespitosum, 
Spikelets glabrous, 
Spikelets elliptical, 
about 1 mm. wide ....13. P. glabrum. 
Spikelets circular, about 
2mm. wide........... 14. P. hemicryptum. 
Racemes numerous. 
Spikelets pubescent. 
Spikelets hemispherical, 
slightly exceeding 1 mm. 
long.......22...2.022..2..-21. P. paniculatum. 
Spikelets flatter, 2mm. long. .31. P. virgatum. 
Spikelets glabrous. 
Axis long-pilose............. 8. P. densum. 
Axis not pilose. 
Spikelets elliptical, 
about 3mm. long. ....32. P. virgatum 
schreberianum. 
Spikelets obovate-circu- 
lar, 2 to 2.5 mm. long. .17. P, millegrana. 
|. Paspalum alterniflorum Rich. in Sagra, Hist. Cub. 11: 299. 1850. 
Paspalum dolichophyllum Hack. Inf. Est. Centr. Agron. Cuba 1: 409, 1906. 
Wright 3841; Guanabacoa, Leon 117 in part; Habana, Tracy 9105, Baker, Tracy & 
Hasselbring in 1907, Leon 564, 585; Marianao, Leon 581. Calabazon, Baker & O’ Dono- 
van HC 4545; Matanzas, Rugel 894 in Herb. N.Y. Bot. Gard. 
Grisebach’s specimen of this species was collected in 1865 and is accompanied by 
the data, ‘‘In small dense tufts, low savannas, Hanabana, May 19.”’ The sheet bears 
the secondary number 167. The Sauvalle specimen is accompanied by the two 
numbers, 3841 and 167, thus connecting the two. In the Grisebach Herbarium is 
a specimen of this collected in Cuba by Rugel and numbered 753a. Grisebach refers @ 
to ‘Rug. 894” under thisname. Richard’s type is at Paris, 
@Cat. Pl. Cub. 231. 1866. 
