POACEAE. 33 



2. Sporobolus Berteroanus (Trin.) Hitchc. & Chase, Contr. U. S. Xat. Herb. 



18:370. 1917. 



Vilfa Berteroana Trin. Mem. Acad. St. Petersb. VI. Sei. Xat. 4 1 : 100. 



1840. 

 Sporobolus angustus Buckley, Proe. Phila. Acad. 1862: 88. 1863. 



Slender, wiry, 1 m. tall or less. Leaves smooth, nearly erect, 1-3 mm. 

 wide, long-attenuate, the lower ones 1.5-2.5 dm. long, the upper shorter; pan- 

 icle narrow, often 3 dm. long; spikelets about 3 mm. long, crowded on the short 

 appressed branches of the panicle; second scale o^ate-oblong, about one half 

 as long as the spikelet. 



Sandy places, Andros, New Providence and Turks Islands : Bermuda ; Vir- 

 ginia and Tennessee to Florida and Texas ; West Indies. Bull-gkass. 



3. Sporobolus atrovirens (H.B.K.) Kunth, Bev. Gram. 1: 68. 1829. 



Vilfa atrovirens H.B.K. Nov. Gen. 1: 138 1815. 



Sporobolus bahamensis Hack. Oest. Bot. Zeitseh. 52: 56. 1902. 



Perennial, the roots of long filiform fibres. Culms very slender, tufted, 

 erect, glabrous, 3 dm. high or less. Leaves glabrous, mostly clustered at the 

 base, narrowly linear, 2-8 cm. long; panicle loose, open, much-branched, 6-15 

 cm. long, its filiform branches spreading, scattered, 2-4 cm. long; the branch- 

 lets bearing a few spikelets about 1.5 mm. long. 



Acklin's Island : Mexico. Filiform Rush-grass. 



4. Sporobolus argutus (Xees) Kunth, Enum. 1: 215. 1833. 



Vilfa arguta Nees, Agrost. Bras. 395. 1829. 



Perennial; culms 3 dm. tall or less, erect, or somewhat decumbent at the 

 base. 'Sheaths shorter than the internodes, their margins sometimes hirsute at 

 the top ; leaves 2.5-5 em. long, 2-4 mm. wide at the base, acuminate, smooth 

 and glabrous beneath, scabrous, and often sparingly hairy at the base above; 

 panicle 3.75-7.5 cm. in length, the branches 1.25-2.5 cm. long, verticillate, at 

 first appressed, finally widely spreading; spikelets 1.5 mm. long; outer scales 

 smooth and glabrous, the' first rounded or obtuse, one-quarter the length of 

 the acute second one; third scale about equalling the second, acute. 



Sandy soil and in the scrub. Eleuthera. Long Island, Fortune Island, Mariguana, 

 Grand Turk, and Inagua : Kansas and Colorado to Louisiana and Texas ; Jamaica ; 

 Cuba to St. Croix ; Antigua ; Trinidad ; tropical continental America. Pointed 

 Dropseed-grass. 



5. Sporobolus domingensis (Trin.) Kunth, Enum. 1: 214. 1833. 



Vilfa domingensis Trin.; Spreng. Xeue Entdeck. 2: 59. 1821. 



Perennial, similar to S. argutus, but usually larger, the culms up to 4 dm. 

 long, the panicle densely many-flowered, narrow, 9 cm. long or less, its branches 

 2-4 cm. long. Spikelets 2 mm. long; first scale about one-half as long as the 

 second. 



Sandy places, scrub, and roadsides. Abaco. Xew Providence. Eleuthera. Little 

 San Salvador, South. Cat Bay, Watling's Island, Long Island, Acklin's Island, Fortune 

 Island, Ambergris Cay, Caicos Islands. Grand Turk. Little Inagua, Inagua, and An- 

 guilla Isles: southern Florida and Texas; Cuba; Hispaniola ; Porto Rico; Jamaica. 

 Domingan Dropseed-grass. 



6. Sporobolus virginicus (L.) Kunth, Bev. Gram. 1: 67. 1S29. 



Agrostis virginica L. Sp. PI. 63. 1753. 



Culms 1.5-6 dm. tall, erect or decumbent, from a stout creeping rootstock. 

 Sheaths numerous, short, overlapping and crowded at the lower part of the 

 culm, smooth, glabrous or sometimes pilose on the margins and at the throat; 

 leaves 2.5-20 em. long, 4 mm. wide or less at the base, distichous, acuminate 

 into a long point, involute on the margins and at the apex, smooth beneath, 



