GRAMINEJ5. (grass FAMILY.) 607 



# * Spikelets manifestily IJ - 2-flowere(l (polygamous, the lower flower ptaminate or often 



neutral, of one or both palets), the lower glume being preaent. 



60. Pantcum. Spikelets not involucrate, nor the peduncles bristle-bearing. Lower glume 



usually small or minute. Sterile flower either stamlnate or neutral. 



61. Setaria* Spikelets spiked or deose-pauicled, the peduncles continued into naked solitary 



bristles or awns : otherwise as in Panicum. 

 63. Cenchrus. Spikelets enclosed 1-6 together in a hard and spin^ or bristly and globular 

 bur-like involucre. 



Subtribe 3. Saccharere* Fertile palets membranaceous or scarious, always of thinner 

 and more delicate texture than the (often indurated) glumes, frequently awned from the 

 tip. Spikelets usually in pairs or threes, panicled or spiked, some of them entirely sterile 

 or rudimentary. 



* Spikelets mondecious, imbedded in the separable joints of the spike. 



63. Trlpsacum. Staminate spikelets above, in pairs at each joint : pistillate spikelets sin- 



gle in each joint ; glumes indurated. 



* * Fertile spikelets with one perfect and one sterile (staminate or mostly neutral) flower! 



lower palet of the perfect flower awned. 



64. Brian th us. Both spikelets at each joint of the rbachis alike fertile, and involucrate 



with a silky tuft : otherwise as in the next. 



65. Aiidrnpo^on. Spikelets a pair at each joint of the plumose-hairy spikes, one of them 



sessile and fertile ; the other pedicelled and sterile or rudimentary. 



66. Sorghiun. Spikelets in open panicles, 2-3 together, tiie lateral ones sterile or some- 



times reduced to mere pedicels. 



1. LEEBSIA, Solander. White Gbass. (PI. 7.) 



Flowers crowded in one-sided panicled spikes or racemes, perfect, but those in 

 the open panicles usually sterile by the abortion of the ovary, those enclosed in 

 the sheaths of the leaves close-fertilized in the bud and prolific. Spikelets 

 I -flowered, flat, more or less imbricated over each other, jointed with the short 

 pedicels. Glumes wanting. Palets chartaceous, strongly flattened laterally 

 or conduplicate, awnless, bristly-ciliate on the keels, closed, nearly equal in 

 length, but the lower much broader, enclosing the flat grain. Stamens 1 - 6. 

 Stigmas feathery, the hairs branching. — Perennial marsh grasses : the flat 

 leaves, sheaths, &c., rough upwards, being clothed with very minute hooked 

 prickles. (Named after iToAn Z)am'ei Xecrs, a German botanist. ) 



» Spikelets narrovlli/ oblong, rather loose!;/ crowded. 



1. L. Virginica, Willd. (White Grass.) Panicle simple; the spikelets 

 closely oppressed on the slender branches, around which they are partly curved 

 (IJ" long) ; stamens 2 (a third imperfect or wanting) ; palets sparingly ciliate 

 (greenish- white). — Wet woods. Aug., Sept, 



2. L. oryzoldes, Swartz. (Rice Cut-gkass.) Panicle diffuse!// branched; 

 spikelets flat, rather spreading (2j'^' - 3" long) ; stamens 3 ; palets strotgly bristly- 

 ciliate (wWtish). — Very wet places : common. Aug. (Eu.) 



* « Spikelets broadly oval, imbricaleJy covering each other (2j"-3" long). 



3. L. lenticul&ris, Michx. (Flt-catch Grass.) Smoothish; panicle 

 simple; palets very flat, strongly bristly ciliate (said to close and catch flies) ; 

 stamens 2: otherwise like the preceding. — Low grounds, Virginia, Illinois, 

 and southward. 



