558 GRAMINE^. 



tdthin Mf jnxtamarginal, scabrous keel; furrows of the ? axis ciliate at the open base. — 

 Willd. ffort. t. 1.— Rottboellia exdtata, Sw. Ohs. ? {noit L.) : the analytical details do not 

 agree.— Leaves 12"'-15"' broad; spike 4"-6", ? part about 1" long.— Hab. Jamaica («ar 

 symn.Sw); Trinidad!, Cr.; [United States to Brazil], 



yC 49. ANDROPOGON, L. 



Spikelets along a jointed axis, the lateral geminate, the fertile in each i)air sessile, the pe- 

 dicellate iucomplete or tabescent. Two inferior sterile glumes herbaceous or chartaceous, 

 the third membranaceous, devoid . of a palea. Fertile flower awned : awn geniculated,, 

 twisted.^-Perennial grasses, rarely annual; axis of the inflorescence -usually bearded. 



Sect. 1. Hetekopogon, Ters. — All inferior spikelets 3, aimless: of the superior the 

 fertile one awned: axis bearded above, glabrous between the $ spikelets: superior 

 joints separating. Exterior glumes awnless : fertile (fourth) glume minute, devoid of a 

 palea. 



151. A. secundus, W. {apud Ns., non Kth.). Nodes and leaves (except at the base) 

 glabrous ; spike solitary : S ghmies acuminate, long-dliate beneath the "winged margin, 

 glabrous on the striate back ; fertile spikelet shortly bearded at the base : awn very long, 

 pubescent below the knee, scabrous above it. — A. contortus, L. ex parte (not the homonym 

 of the old world). Heteropogon hirtus, Pers. {ex pi. Spruce). — Spike l"-2" long : S spike- 

 lets oblong-lanceolate, $ subcylindrical, pubescent i awns 3" long, turned irregularly to one . 

 side. — Hab. Antigua 1, Wullschl.; [Cuba! to Peru!]. 



Sect. 2. Gymnandkopogon, Ns.-rFertile spikelets awned, pedicellate $ or neutral, awn- 

 less : axis bearded : joints separating. Exterior glumes awnless, third and fourth (the 

 fertile) devoid of palea. 



] 52. A. saccharoides, Sw. I Nodes bearded ; leaves pilose near the base or glahres- 

 cent ; spikes fasdcled-racemose ; pedicellate spikelets neutral, as long as or exceeded by 

 the sericeous beard of the axis ; fertile spikelets sericeous-villous below ; 2 exterior glumes 

 acuminate, striate, fourth transformed into the scabrotis awn : exserted part of the latter 

 3-5 times as long as the glumes. — Cultivated in European gardens as A. argenteus, DC. — 

 l'-3' high, variable in the length of the leaves, the number of spikes, the down of the glumes, 

 and the development of the neutral spikelets ; ^ spikelets 2"' long, oblong-lanceolate. — Hab. 

 Jamaica !, Sw. ; Wullschl., on dry hills ; Antigua !, Wullschl., Dominica I Imr. ; [Arkan-. 

 sas !, New Mexico ! ; Cuba I to Buenos Ayres !]. 



Sect. 3. ScHiZACHlKiuM, Ns. (Cymbopogon, Ns.). Character of Gymnandropogon, but 

 spikes supported by cymbifprm bracts, pedicellate spikelets often awned, joints tardily 

 separating, and fourth (Ike fertile) glume 2-partite or %fid, with the awn inserted be- 

 tween the divisions. 



153. A. brevifolius, Sw. I Slender, ascending, branched ; nodes and short leaves gla- 

 <j^ 'brous ; spikes in bracteate racemes, included partly within the narrow bract : joints thickened, 

 ' glabrous, except a short beard at the base of the fertile spikelets : pedicellate pikelets re- 

 duced to 1-2 glumes : one of the latter terminated with a straight awn ; exterior glumes of 

 the fertile spikelet awnless, lowest acuminate, shortly 2-dentate, fourth 2-partite : exserted 

 part of its awn twice-thriee as long as the glumes. — Kth. E6v. 1. 196. — Schizachyrium, Ns; 

 — 2'-4' high, said to be annual ; bracts about 1" long ; $ spikelets lanceolate, li'" l»ng. — 

 Hab. Jamaica !, Sm., Wullschl., in sandy soil ; Tiinidad !, O. ; [Cuba ! and Mexico I to 

 Brazil I ; trop. Africa; East Indies !]. 



154. A. condensatus, Kth. Stont, erect, glabrous; spikes in a dense panicle, ra- 

 , eluded partly by the narrow bract : joints and pedicels thickened above, bearded their whole 



tp' length with spreading wool ; pedicellate spikelets reduced, snbuliform ; exterior glumes of 

 the fertile spikelets acuminate, fourth 2-partite : exserted part of its awn twice as long as 

 the glumes.— Schizachyrium, JVi.- 2'-5' high ; panicle often 1', bracts 6"'-9"', spikelets 

 2"' long, the latter linear-acuminate. — Hab. Trinidad !, Sch., Cr., in savannahs ; [Mexico ! 

 to Uruguay !]. 



