GRAMINEiE. 543 



base), narrower than the spikelets ; spikelets 4-3 -seriate, oval or obovate-rouudish, blunt, 

 pedicellate, glabrescent : sterile glumes 5-uerved, superior (the third) at length flat within 

 the tumid margin. — Trin. Ic. t. 140. — P. undulatimi, Voir. — Nearly allied to P. scrobicu- 

 latum, L., of the old world, the spikes of which have a broader axis. 2'-3' high, variable in 

 the down ; leaves 4"'-l"' broad ; spikes l"-2", spikelets l'"-l£'" long, the latter becoming 

 brown. — Hab. Jamaica !, all coll. ; [United States to Uruguay !]. 



76. P. virgatum, L. Ccespitose, stout, erect ; leaves long, flat, glabrous, scabrous at 

 the margin ; spikes numerous, one terminal, about as long as the rest, the other spreading, 

 subapproximate, rarely geminate : axis 3-gonal, convex or flattish on the back, scabrous at 

 the margin or ciliate (rarely glabrate), narrower than or as broad as the spikelets ; spikelets 

 4-seriate, obovate or roundish-elliptical, blunt, mucronate, pedicellate, pubescent at the 

 margin or glabrous : sterile glumes ^-nerved, superior slightly loosened at the margin. — SI. 

 t. 69. f. 2. — Andropogon fasciculatus, L. Sp. ed. ii. (ex Ic. SI.) — Very variable, 3"-5" 

 high j leaves 8"'-3"' broad ; spikes 3"-5", spikelets 1"' long. 



o. Axis nearly as broad as the spikelets ; glumes becoming brown ; leaves narrow. 



P. slramineum. Axis half as broad as the spikelets : glumes straw-coloured or at length 

 purplish-tawny, usually glabrous. — Trin. Ic. t. 131. — Leaves broad or narrow. 



Hab. Tamaica !, Al., March, common in savannahs! (o, /3) ; Antigua!, Wullschl. (ff) ; 

 Trinidad !, Sieb. TV. 11 ; [Cuba ! and Mexico ! to Uruguay !]. 



** Spikes numerous, the superior gradually shorter. 



77. P. paniculatum, L. Csespitose, erect ; leaves long, broad, hairy or glabrescent, 

 undulate ; spikes numerous, slender, superior shorter, approximate, inferior often 2-3-nate, 

 most curved-spreading : axis 3-gonal, convex or flattish on the back, narrower than the 

 small spikelets ; spikelets 4-3-seriate, roundish or obovate-roundish, blunt, puberulous on 

 the convex side, unequally pedicellate: sterile glumes 3-nerved.— SI. t. 72. f. 2. Trin. Ic. 

 t. 127.— P. strictum, Pers. P. polystachyon, Salzm.—2'-Z' high ; leaves 8"'-l 2'" broad ; 

 inferior spikes 3'' long, spikelets V" diam., tinged with browu. — Hab. Jamaica !, all coll. ; 

 Trinidad !, Sch. ; [Cuba ! and California ! to Rio Grande do Sid ! ; Galapagos !]. 



78. P. densum, Pair. Stout, erect ; leaves long, glabrous ; spikes very numerous, 

 thickish, densely approximate, spreading, superior gradually shorter, most 2-3-nate along 

 the sulcate common axis .- special axis 3-gonal, flat on the back, ciliate with long hairs (or 

 "glabrate"), about as broad as the small spikelets; spikelets 4-seriate, roundish, rounded 

 with a minute blunt point, unequally pedicellate, glabrous : sterile glumes 3-nerved. — Trin. 

 Ic. t. 122. — 4'-5' high; leaves 6'" broad; inferior spikes 2"(-5"), uppermost J'" long; 

 spikelets 1'" diam., straw-coloured. — Hab. S. Vincent!, Guild.; [Cuba! and Mexico! to 

 Brazil !]. 



Seet. 2. Cabrera, Lag. — Spikelets involucrate by a bundle of yellow bristles. 



79. P. pulchrum, W. Csespitose, erect ; leaves hairy or ciliate at the base ; spikes 

 2-8, l(-2)-terminal, most approximate : axis 3-gonal, flat on the back, as broad as the 

 spikelets, ciliate : iuvolucral bristles yellowish, spreading, longer than the spikelets : spike- 

 lets 2- seriate, subsessile, obovate-oblong, bluntish : sterile glumes 3-5-nerved, glabrous or 

 puberulous along the nerves. — Kth. Rev. t. 164. Trin. Ic. t. 99, 101. — P. canescens, Ns. ! : 

 the hairy form. P. ramosissimum, Ns. ! : a form branched at the base. P. chrysostachyum, 

 Schred. : the form with glabrous glumes. P. aureum, PI. Spruce. P. chrvsodactylon. Tr. 

 — 2'-3' high; leaves somewhat rigid, 4"'-2'" broad; spikes 4"-2"(-l"), spikelets i'", 

 bristles V" long. — Hab. Trinidad !, Cr. ; [Guiana !, Brazil !]. 



33. DIGITARIA, Scop. 



Character of Paspalum, but fertile glume membranaceous at the margin, and broadly over- 

 lapping the palea. Lowest sterile glume often appearing, but minute. Caryopsis concave- 

 convex, rarely flat-convex. — Root mostly annual ; spiciform racemes approximate or fasci- 

 cled: spikelets narrow, in pairs, one pedicellate, the other subsessile .- fertile glume placed 

 against the axis. 



* Spikes suberecl. « 



78. D. filiformis, Miihl. (non Kocl). Slender, hairy at the base; leaves narrow' 



