280 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Dry hills, southern Mexico and Central America; also Cuba, in the vicinity 

 of Habana. 



4. Andropogon condensatus H. B. K. Nov. Gen. & Sp. 1: 188. 1816. 

 Andropogon microstachyus Desv. ; Hamilt. Prodr. PL Ind. Occ. 8. 1825. 

 Schizachyrium condensatum Nees, Agrost. Bras. 333. 1829. 



PoUinia microstachya Desv. Opusc. 70. 1831. 



A tall robust tufted glabrous perennial with compressed culms, repeatedly 

 branching toward the summit, forming a large corymbose mass of racemes with 

 very fiexuous rachises and delicate awns about 12 mm. long. 



Open, rather dry ground, eastern Mexico and the southern West Indies to 

 Argentina. Originally described from Colombia ; A. microstachyus described 

 from the Antilles. 



Guadeloupe, Dominica, Martinique, St. Lucia, St. Vincent, Grenada, Trinidad, 

 and Tobago. 



5. Andropogon multinervosus (Nash). 



Schizachyrium multinervosum Nash, N. Amer. Fl. 17: 109. 1912. 



A wiry, sparingly branching perennial with filiform blades and few racemes 

 with delicate awns. 



Palm barrens, Madruga and Camaguey, Cuba, the type specimen from Ma- 

 druga, Britton & Shafer 608. 



6. Andropogon gracilis Spreng. Syst. Veg. 1: 284. 1825. 

 Andropogon juncifolius Desv. ; Hamilt. Prodr. PI. Ind. Occ. 9. 1825.* 

 Sorghum gracile Kuntze, Rev. Gen. PI. 2: 791. 1891. 

 Schizachyrium gracile Nash in Small, Fl. Southeast. U. S. 60. 1903. 



A densely tufted slender erect wiry glabrous perennial with filiform blades 

 and delicate pale feathery racemes 2 to 5 cm. long, the delicate awns 1 to IS 

 cm. long. 



Rocky hills and banks, southern Florida and the West Indies. Originally 

 described from Hispaniola. The type of A. juncifolius is from Santa Cruz [St. 

 Croix]. Described as A. scoparius by Richard. 2 



Bahamas, Cuba, Jamaica, Haiti, Santo Domingo, Porto Rico, and Guadeloupe. 



7. Andropogon cubensis Hack. Flora 68: 121. 1885. 

 Sovghum cubense Kuntze, Rev. Gen. PI. 2: 791. 1891. 

 Schizachyrium cubense Nash, N. Amer. Fl. 17: 109. 1912. 



Similar to the preceding; culms taller, the racemes but sparsely silky, the 

 awns less than 1 cm. long. 



Known only from the type collection from an unrecorded locality in Cuba 

 (Wright 3898), and from a collection from the Isle of Pines (Britton & Wilson 

 14291). 



8. Andropogon virgatus Desv. ; Hamilt. Prodr. PI. Ind. Occ. 9. 1825. 

 Eypogynium spathiflorum Nees, Agrost. Bras. 366. 1829. 

 Anatherum virgatum Desv. Opusc. 71. 1831. 



Andropogon spathiflorus Kunth, Enum. PI. 1: 496. 1833. 



Andropogon inermis Steud. Syn. PI. Glum. 1: 390. 1854. 



Anatherum spathiflorum Griseb. Cat. PI. Cub. 236. 1S66. 



Anatherum inenne Griseb. Cat. PL Cub. 236. 1866. 



A tall glabrous tufted perennial with compressed rigid culms, long linear 

 blades, and elongate panicles of small glabrous racemes partly inclosed in rufous 

 or purplish spathes. 



1 It is uncertain which of these names is the earlier. 

 *In Sagra, Hist. Cuba 11: 320. 1850. 



