384 Nash : Enumeration of the 



1. Chaetochloa purpurascens (H.B.K.) S. & M. Bull. U. S. 



Dept. Agric. Div. Agrost. 21 : 13. 1900. 



Setaria piirpiirasccns H.B.K. Nov. Gen. & Sp. I : 1 10. 181 5. 

 In fields and waste places, frequent. Santurce, Heller 14 and 



329- 



2. Chaetochloa imberbis (Poir.) Scribn. Bull. U. S. Dept. Agric. 



Div. Agrost. 4: 39. 1897. 



Panicimi iuibcrbc Poir. in Lam. Encycl. Suppl. 4 : 272. 18 16. 

 Sintenis 208 {fide Scribn. & Merr. 1. c.) ; Adjuntas road, near 

 Ponce, Heller 6240. 



Chaetochloa imberbis geniculata (Lam.) S. & M. Bull. U. S. 

 Dept. Agric. Div. Agrost. 21 : 12. 1900. 



Paniciiin gcnicidahini Lam. Encycl. 4: 727. 1797. 



Differs from the species in having stouter geniculate stems, 

 broader leaf-blades, and a longer inflorescence. 



Humacao, Blauner 233. 



3. Chaetochloa scandens (Schrad.) S. & M. Bull. U. S. Dept. 



Agric. Div. Agrost. 21 : 17. 1900. 



Setaria scandens Schrad., Schult. Mant. 2 : 279. 1824. 

 Sintenis 6498 {fide Scribn. & Merr. 1. c). 



21. CENCHRUS L. Sp. PI. 1049. i753i 



Involucres 4-6-flowered, armed at the base with erect barbed bristles. 



1. C. echinatits. 

 Involucres 2-flowered, armed at the base with generally shorter reflexed spines. 



2. C. tribidoides. 



1. Cenchrus echinatus L. Sp. PI. 1050. 1753. 



In sandy waste places, common. Santurce, Heller 3 and 

 1346; Cayey, Underwood and Griggs 406. 



2. Cenchrus tribuloides L. Sp. PI. 1050. 1753. 

 Fajardo, Blauner 242. 



22. STENOTAPHRUM Trin. Fund. Agrost. 175. 1820 



I. Stenotaphrum secundatum (Walt.) Kuntze, Rev. Gen. 794. 

 1891. 



Ischaeimun secimdatiun Walt. Fl. Car. 249. 1788. 



Roadside near Bayamon, Heller i 241 ; in sand, Manati to Vega 

 Baja, Underwood and Griggs 959. 



