376 Nash : Enumeration of the 



Mayaguez to Joyua, June 14 to July 22, 1901, no. 149. The fol- 

 lowing specimens also belong here : Plaza de Humacao, Eggers 

 6^6, 1881 ; between Mayaguez and Afiasco, Sintenis 1223, 1885, 

 and near Guanica, 3412/7, 1885, of the same collector; Santurce, 

 Heller 594 ; near Mayaguez, Heller 4368. 



Related to P. denswn Poir., but that has more numerous ra- 

 cemes and much smaller spikelets. 



3. Paspalum Boscianum Fluegge, Gram. Mon. 171. 18 10. 



Paspalum piirpiirascens Ell. Bot. S. C. & Ga. i : 108. 1817. 

 El Yunque, Luquillo Mts., Wilson 43. 



4. Paspalum Helleri sp. nov. 



A tufted nearly glabrous perennial. Stems 4-8 dm. tall, 

 finally branching above, rather slender, smooth and glabrous, the 

 nodes glabrous : leaves usually 3 ; sheaths smooth and glabrous, 

 shorter than the internodes ; ligule a scarious ring about i mm. 

 long ; blades erect, or drooping at the end, smooth and glabrous 

 on the surfaces with the exception of some long hairs on the 

 upper surface just back of the ligule, the margins rough, linear, 

 acuminate at the apex, the larger ones 1.5-2.5 dm. long and 5-7 

 mm. wide : racemes 2-4, sometimes single on the branches, slen- 

 der, 6-9 cm. long, the rachis more or less flexuous, winged and 

 about I mm. wide : spikelets in pairs, 2 mm. long and about i 

 mm. wide, elliptic, obtuse, the two outer scales 3-nerved, the first 

 scale pubescent with long weak hairs, the second one glabrous, the 

 third scale and palet greenish. 



In fields and waste places. Type collected at Santurce, Jan. 

 9, 1899, by Heller, no. 10. No. 164, secured by this collector at 

 the same place, also belongs here. 



5. Paspalum hemisphaericum Poir. in Lam. Encycl. 5:31. 1804. 

 Paspalum paniculaUnn Gaertn. Fruct. Sem. 2 : 2, pi. So. 



1 79 1. In part. Not Linnaeus. 



Near Mayaguez, Heller 4399; Adjuntas road, near Ponce, 

 Heller 6227. 



6. Paspalum virgatum L. Syst. Ed. 10, 855. 1759. 



In sandy soil, common. Luquillo Mts., Wilson 227 ; Rio 

 Piedras, Heller 130 and 625 ; Cataiio, Heller 1373 ; Underwood 

 and Griggs 794. 



