GRAMINEiE. 559 



155. A. ^acilis, Sprenj. Cajspitose, slender, glabrous; leaves convolute-setaceous; 

 spikes solitary : the lateral distant, sheathed by a narrow bract : joints and pedicels filiform, 

 hearded their whole length with spreading wool : pedicellate spikelets reduced to a single, 

 awned glume ; exterior glumes of the fertile spikelet acuminate, fourth shortly 2-fid ; ex- 

 serted part of its awn 3-4 times as long as the glumes. — ;Habit of Anatherum. domingense, 

 but awn geniculated in the fertile flower.-^l'-2' high ; spikes delicate, about 1" long : 

 bract l"-2" long : peduncle included or exserted ; spikelets 2'" long, lanceolate, exceeded by 

 the sterile, woolly pedicel : awn of the latter straight. — Hab. Jamaica !, Wullschl., Man- 

 chester; [Cuba!, Haiti]. 



Sect. 4. DiECTOMis, P. B.~— Fertile spikelets with 2 awns : one awn straight from the 

 second exterior glume, the other geniculated from the fourth, which has apalea. Pedi- 

 cellate spikelets S: their exterior glumes awned, the interior awnless. Axis .with 



I bearded, separating joints. 



/^ 156. A. fastigiatus, Sw. Erect, glabrous ; ligule oblong-lanceolate ; spikes long- 

 peduncled, in a lax iracteafe corymb : joints and pedicels clavate, the latter obliquely ex- 

 cavated at the summit : beard distichous, decurrent at the base ; lowest glume of the fertile 

 spikelet compressed-keeled, ciliate : geniculated awn long-exserted ; S glumes unequal, the 

 lowest larger, striate, flattish. — Kth. Nov. Gen. t. 64. — 2^' high ; spikes l"-2", larger S 

 glumes 4'" long: fertile spikelet half-spatbulate, 2'", its straight awn about 6'", the other 

 1" long. — Hab. Jamaica !, Al., Wullschl., in sandy hills ; [Mexico to Brazil !]. 



50. ANATHERUM, P. B. 



Character of Andropogon, but exterior glumes chartaceous-membranaceous, and awn of 

 the fertile flower straight, terminal or wanting. — Peduncles bracleate : pedicels and rhachis 

 long-bearded by spreading wool : lateral spikelets nearly reduced to the pedicel, fertile 

 usually monandrous : exterior glumes narrow, few-nerved, awnless. 



This genus from the wool of the spikelets and the submembranaceous texture of the glumes 

 approaches Saccharum and Erianthus, which are distinguished by the artificial character of 

 the spikelets all complete. 



157. A. domingense, R. S. Csespitose, slender, few-branched ; spikes 2-4, digitate : 

 fourth glume devoid of a palea, aa)»te«, or the awn hair-like, included or shortly exserted. 

 — Sl.t. 6S.f. 2.— A. virginicum, Spreng. (Andropogon, L. ex parte: Grouovius's synonym 

 belongs to the allied, but longrawned A. vaginatus. Ell.) Andropogon leucostaehyus, Kth. — 

 l'-3' high ; leaves 1'" broad, glabrous, rarely pilose ; spikes 6'"-12"', spikelets 1^"', pedi- 

 cels 2'", wool 4"'-6"' long. — Hab. Jamaica !, Pd., in savannahs, Westmoreland : Trinidad !, 

 Lockh., Or., in savannahs; [Haiti and Mexico, to Brazil !J. 



158. A. bicorne, P. B. {Sieb. Mart. 40). Stout, glabrous; spikes in a large, com- 

 pact, fastigiate panicle : spikelets awnless ; fourth glume devoid of a palea. — SI. t. 15. — 

 Andropogon, L. Saccharum, Gr. — 4'-6' high ; leaves 2'" broad ; panicle 1', spikelets 1^'", 

 wool 4'" long. — Hab. Jamaica (L.); S. Kitts!; Antigua!, Wullschl., S. Vincent!, Guild.; 

 [Cuba I and Mexico ! to Brazil !, in wet places and fields]. 



159. A. macrurum, Gr. Stout, pilose or ciliate along the sheaths ; spikes in a large 

 compact panicle : spikelets awned : awn 4-5 times as long as the glumes j fourth glume de- 

 void of a palea.— Andropogon, Mich. — Habit of the preceding ; leaves 2'" broad ; panicle 

 12"- 6" spikelets 3^'", wool 4"'-3"' long. — Hab. Jamaica!, Al., Wils., Wullschl., com- 

 mon; Antigua I, Wullschl.; [United States; Cuba I, Haiti]. 



51. VETIVEKIA, Thouars. 



Character of Andropogon, but exterior glumes in both kinds of spikelets cartilaginous 



muricate inner membranaceous glume ciliate, and awn of the fertile flower straight, mcluded 



or wanting.— Spikes slender, shortly peduncled, whorled in racemes ; pedicellate spikelets 



S: no wool; spinuks thickish at the base, incurved. 



160 V. arundinacea, Gr. Stout, glabrous ; spikelets lanceolate-linear, acuminate ; 



fourth glume 2-dentate, bearing a short included bristle between its teeth, twice as long as 



r 



