GRASSES OF Porto Rico 385 
23. OLYRA L. Syst. Ed. 10, 1261. 17509 
1. OLYRA LATIFOLIA L. Syst. Ed. 10, 1261. 1759. 
Near Mayaguez, Heller 4443 and 4583. 
24. PHARUS P. Br. Hist. Jam. 344. 1756 
1. PHARuS BrasiLrensis Raddi, Agrost. Bras. 21. 182 cs 
Rio Blanco, Blauner; ravine, Coamo Springs, Underwood and 
Griggs 505 and 845. 
25. ARISTIDA’L. Spo Fi Sa. 1753 
1. ARISTIDA DISPERSA Trin. & Rupr. Mem. Acad. Sci. St. Petersb. 
Vi.OF% 12g. 1826. 
Guanica, Sintenis 3766. 
"26. SPOROBOLUS R. Br. Prod. 169. 1810 
Stems tufted, not arising from rootstocks. 
Spikelets about 2 mm. long, the second scale half as long or less. 
1. S, Lndicus. 
Spikelets about 3 mm. long, the second scale fully as long. 2. S. purpurascens. 
Stems arising from long branching rootstocks. 3. S. Virginicus. 
1. Sporoso.us Inpicus (L.) R. Br. Prod. 170. 1810. 
Agrostis Indica L. Sp. Pl. 63. 1753. 
In sandy soil, common. Santurce, Heller 985 and 1275; 
Lecheria, Goll 22. 
2. SPOROBOLUS PURPURASCENS (Sw.) Hamilt. Prod. 5. 1825. 
Agrostis purpurascens Sw. Prod. 25. 1788. 
Near Mayaguez, Heller 4590. 
3. SporopoLtus Vircinicus (L.) Kunth, Rev. Gram. 1: 67. 
1829. 
Agrostis Virginica L. Sp. Pl. 63. 1753. 
On sand dunes and in sandy soil, frequent. Santurce, Heller 
1412; Maunabo, Sintenis 5084. 
27. CHLORIS Sw. Prod. 25.. 1788. 
Spikes slender : flowering scale lanceolate, not long-ciliate. 1. C. radiata, 
Spikes stout : flowering scale oval, long-ciliate on the margins above. 
2. C. Paraguiensis. 
1. CHLORIS RADIATA Sw. Prod. 26. 1788. 
In moist soil and waste places, common. Catafio, Heller 109 ; 
