Grasses of Pokto Rico 385 



23. OLYRA L. Syst. Kd. 10. 126 1. 1759 

 I. Olvra latifolia L. Syst. Ed. 10, 1261. 1759. 

 Near Mayagucz, Heller 4443 and 45^3- 



24. PII.XKUS V. Hr. Hist. Jam. 344. 1756 

 I. Pharus Brasiliensis Raddi, Ai,^rost. Bras. 21. 1823. 



Rio Blanco, Blauner ; ravine, Coamo Springs, Underwood and 

 Griggs 505 and 845. 



25. ARISTIDA L. Sp. PI. 82. 1753 

 1. Aristida dispersa Trin. & Rupr. Mem. Acad. Sci. St. Petersb. 

 VI. 7 : 129. 1829. 

 Guanica, Sintenis 3766. 



26. SPOROBOLUS R. Br. Prod. 169. 18 10 



Stems tufted, not arising from rootstocks. 



Spikelets about 2 mm. long, the second scale half as long or less. 



1. S. Indicus. 

 Spikelets about 3 mm. long, the second scale fully as long. 2. S. purpurascens. 



Stems arising from long branching rootstocks. 3. S. Virginicus. 



1. Sporobolus Indicus (L.) R. Br. Prod. 170. 18 10. 

 Agrostis Indie a L. Sp. Pi. 63. 1753- 



In sandy soil, common. Santurce, Heller 985 and 1275; 

 Lecheria, Goll 22. 



2. Sporouolus purpurascens (S\v.) Hamilt. Prod. 5. 1825. 



Agrostis purpurascens ^w. Prod. 25. 1788. 

 Near Mayaguez, Heller 4590. 



3. Sporobolus Virginicus (L.) Kunth, Rev. Gram, i : 67. 



1829. 

 Agrostis Virgifiica L. Sp. PI. 63. 1753. 



On sand dunes and in sandy soil, frequent. Santurce, Heller 

 141 2 ; jNIaunabo, Sintenis 5084. 



27. CHLORIS Svv. Prod. 25. 1788. 



Spikes slender : flowering scale lanceolate, not long-ciliate. i. C. radiatit. 



Spikes stout : flowering scale oval, long-ciliate on the margins above. 



2. C. Paraguiensis. 



I. Chloris radiata S\v. Prod. 26. 1788. 



In moist soil and waste places, common. Catafio, Heller 109 ; 



