200 CONTRIBUTIONS FEOM 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 1. P. alterniflorum. 



Racemes more than 1, often numerous. 



First glume present 4. P. ciliiferum. 



First glume obsolete. 



Sterile lemma transversely wrinkled; 

 spikelets brown. 



Spikelets obovate ,24. P. plicatulum. 



Spikelets elliptical 11. 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- 

 lar 3. P. caespitosum. 



Spikelets glabrous. 



Spikelets elliptical, 



about 1 mm. wide 13. P. glabrum. 



Spikelets circular, about 



2 mm. wide 14. P. hemicryptum. 



Racemes numerous. 



Spikelets pubescent. 



Spikelets hemispherical, 

 slightly exceeding 1 mm. 



long 21. P. paniculatum . 



Spikelets flatter, 2 mm. long. .31. P. virgatum. 

 Spikelets glabrous. 



Axis long-pilose 8. P. densum. 



Axis not pilose. 



Spikelets elliptical, 

 about 3 mm. long 32. P. virgatum 



schreberianum. 

 Spikelets obovate-circu- 



lar, 2 to 2.5 mm. long. .17. P. millegrana. 



1. 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 <k 

 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 this name. Richard's type is at Paris. 



a Cat. PI. Cub. 231. 1866. 



