GRASSES OF Porto Rico 383 
16. ICHNANTHUS Beauv. Agrost. 56, p/. 12, f. 7. 1812 
1. ICHNANTHUS PALLENS (Sw.) Munro; Benth. Fl. Hongk. 414. 
1861. 
Panicum pallens Sw. Prod. 23. 1788. 
In wet shaded places, common. Bayamon, Heller 92; San- 
turce, Heller 826; Mayaguez, Heller 4374 and 4479; Puente 
Fluco, Goll 884; Adjuntas road, near Ponce, Heller 6093. 
17. OPLISMENUS Beauv. FI. Owar. 2: 14, p/. 68. 1807 
1. OPLISMENUS SETARIUS (Lam.) R. & S. Syst. 2: 481. 1817. 
Panicum setarium Lam. Il. 1: 170. 1791. 
In moist soil, frequent. Pifion, Goll 623 ; Adjuntas road, near 
Ponce, Heller 6303. 
18. ECHINOCHLOA Beauv. Agrost. 53, pl. rz, f. IZ. 
1812. 
1. Ecurnocuioa corona (L.) Link, Hort. Berol. 2: 209. 1833. 
Panicum colonum L. Syst. Ed. 10, 870. 1759. 
In fields and waste places, common. Catafio, Heller 108 ; 
Mayaguez, Heller 4409; Coamo Springs, Goll 660. 
19. SACCIOLEPIS Nash, in Britt. Man. 89. 1901. 
1. Sacciolepis striata (L.). 
Flolcus striatus L. Sp. Pl. 1048. 1753. 
Panicum striatum Lam. Ill. 1: 172. 1791. 
Panicum gibbiim Ell. Bot. S. C. & Ga. 1: 116. 1817. 
Sacciolepis gibba (Ell.) Nash, in Britt. Man. 89. 1901. 
Wet ground, near Santurce, Heller 1363. 
20. CHAETOCHLOA Scribn. Bull. U. S. Dept. Agric. 
Div. Agrost. 4: 38. 1897 
Setae at the base of the spikelet 5 or more, involucrate, antrorsely scabrous. 
Setae short, not more than twice as long as the spikelet: inflorescence usually 
slender. 1. C. purpurascens. 
Setae longer; inflorescence stout. 2. C. imberbis. 
Setae 1-3 at the base of each spikelet, not involucrate, retrorsely scabrous above, 
antrorsely below. 3. C. scandens. 
