GRAMINEJE. 545 



not awned). Fertile flower chartaceous, awnless. — Ascending, broad-leaved grasses, radicant 

 al the base ; spike compound, often interrupted : spikelets one-sided. 



83. O. hirtellus, It. Br. Leaves lanceolate, acuminate, undulate, puberulous : sheath 

 pilose ; spikes distant ; common axis pubescent : spikelets 3-10, pubescent ; lowest awn 

 smooth, bluntish, 3-5 times as long as its glume ; third glume shortly awned, furnished with 

 a palea. — Panicum, L., Sw. (Oplismenus, R. S.). P. velutinum, Mey. — Leaves 1 ^"-2 \" long, 

 4"-6"' broad ; lowest awn 4"'-5"' long. — Hab. Jamaica !, March, in woods ; Trinidad !, 

 Sch. ; [Guiana]. 



84. O. loliaceus, Spreng. Leaves oblong-lanceolate or lanceolate, acuminate, glabrous 

 (or glabrescent) : sheath glabrous, ciliate (rarely sparingly pilose) ; spikes about as long 

 as their internodes, usually oblong : common axis nearly glabrous, special hispid : spikelets 

 fascicled, subdistant, glabrous or glabrescent ; lowest awn smooth, bluntish, 3-4 times as 

 long as its glume ; third glume shortly awned, furnished with a palea. — Pariicum, Lam. 

 Oplismenus, P. B. O. cubensis, Spreng. — Leaves 2"-4" long, 5"'-8'" broad; spikes 5'"- 

 10'", lowest awn 4"'-8'" long. — Hab. Dominica!, Imr. ; Trinidad!, Cr. ; [Cuba! and 

 Mexico ! to Erazil !]. 



85. O. setarius, Spreng. Leaves ovate-lanceolate or lanceolate, shortly acuminate, 

 glabrescent : sheath ciliate ; spikes short, very distant : common axis nearly glabrous, 

 special hispidulous : spikelets 3-7 ', glabrescent icith ciliate glumes, approximate ; lowest 

 awn smooth, bluntish, much longer thau its glume ; third glume shortly awned, furnished 

 with a palea. — Panicum, Lam. Oplismenus, P. B. — Habit exactly of O. undulatifolius, 

 Spreng., which has pilose sheaths and undulate leaves. Leaves l"-2" long, 3"'-6'" broad ; 

 spikes 2"'-4'", lowest glume 3"'-6'" long.— Hab. Jamaica!, Al., Wils.; Antigua!, Wullschl, 

 Dominica !, Imr. ; [Cuba ! and Mexico ! to Brazil]. 



37. PANICUM, L. 



Sterile glumes 3, herbaceous or membranaceous, awnless, lowest clasping, mostly smaller, 

 superior usually furnished with a palea. Fertile flower at length cartilaginous, usually awn- 

 less, flat -convex or ovoid. 



Sect. 1. Bkachiaria, Tr. — Fertile flower flat-convex. Spikelets ellipsoidal, pointed, 

 2-4-seriale on one side of the axis, in terminal and lateral, subsessile, alternate spikes or 

 spicifonn racemes. 



§ 1. Fertile flower compressed from the back, awnless (Paspaloidea, Ns.). 



86. P. paspaloides, Pers. Perennial, glabrous ; leaves linear-acuminate : ligule 

 shortly ciliate ; lateral spikes about as long as their internodes, erect ; spikelets 2-seriate, 

 very shortly pedicellate, glabrous ; lowest glume subtruncate, one-third as long as, second 

 little shorter than, the fertile flower, the latter ovate, pointed, dotted. — Trin. Ic. t. 168. — 

 P. truncatum, Tr. P. affine, Ns.— 1'-2' high; spikes 12"'-6'" long, 10-20, inferior 

 longer; spikelets 1'" long. — Hab. Antigua!, Wullschl. ; [Haiti! and Mexico to Brazil; 

 Egypt ! to trop. Africa and East Indies]. 



§ 2. Fertile flower terminated by a scabrous mucro. Embryo larger than half the length 

 of the albumen (Echinochloa, P. B.). 



87- P. colonum, L. Annual ; leaves linear-acuminate, glabrous : ligule none ; lateral 

 spikes about as long as their internodes ; spikelets 4(-6) -seriate, very shortly pedicellate, 

 scabrous-pubescent ,- sterile glumes mucronate, lowest short, 2 superior equalling or shortly 

 exceeding the fertile flower, the latter elliptical, nearly half-terete, minutely mucronate. — 

 Trin. Ic. t. 160. — P. pseudocolonum, Rth. : a form with bristles at the base of the spikes. 

 P. Daltoni, Parlat. ! : the same. P. zonale, Guss. ■. a form with purple-zonate leaves. 

 P. brizoides, Sw. ? (non L.). P. fluitans, Mey. Esseq. {non Itetz). P. Petiveri, Kotsch. 

 Nub. {non Trin.).—V-l\' high; spikes 6"'-12'" long, 4-20, inferior longer ; spikelets V" 

 long. — Hab. Jamaica !, all coll.; Antigua!, Wullschl., Dominica !. Imr. ; Trinidad!, Al. ; 

 [common in all tropical countries, ranging to Texas !, Florida !. Spain !, southern Italy !, 

 Egypt ! and Arabia !]. 



