558 GRAMINE^S. 



within the juxtamarginal, scabrous keel ; furrows of the ? axis ciliate at the open base.— 

 Willd. Hort. t. 1.— Rottbrellia exaltata, Sw. Obs. ? {non L.)-. the analytical details do not 

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

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



49. ANDROPOGON, L. 



Spikelets along a jointed axis, the lateral geminate, the fertile in each pair sessile, the pe- 

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

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

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



Sect. 1. Heteropogon, Pers. — All inferior spikelets $ , awnless: 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. 



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

 glabrous ; spike solitary : $ glumes acuminate, long-ciliate 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 hirtns, Pers. {ex pi. Spruce). — Spike l"-2" long: <? spike- 

 lets oblong-lanceolate, $ subcylindrical, pubescent : awns 3" long, turned irregularly to cne 

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



Sect. 2. Gymvandrofogon, Ns. — Fertile spikelets awned, pedicellate $ or neutral, awn- 

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

 fertile) devoid of palea. 



152. A. saccharoides, Sw. ! Nodes bearded ; leaves pilose near the base or glabres- 

 cent ; spikes fascicled-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 scabrous 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. ; WuUschl., on dry hills ; Antigua !, WuUschl., Dominica ! Imr. ; [Arkan- 

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



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

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

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

 tween the divisions. 



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

 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 spikelets 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-thrice as long as the glumes. — Kth. Rev. 1. 196. — Schizachyrium, Ns. 

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

 Hab. Jamaica !, Sw., WuUschl., in sandy soil ; Trinidad !, Cr. ; [Cuba ! and Mexico ! to 

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



154. A. condensates, Kth. Stout, erect, glabrous; spikes in a dense panicle, in- 

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

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

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

 the glumes.— Schizachyrium, Ns.— 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 I]. 



