718 GRAMINE 4 IMPERATA 
PASPALUM 
SuporpER 1 PANICACEZ R. Br. Verm. Schr. i, 114. 
Spikelets one- or two-flowered, when two-flowered the second or 
terminal one is perfect and the lower one staminate or neutral. 
Rachella articulated below the empty glumes the spikelets falling 
from the pedicels entire either singly or in groups or with the 
joints of an articulated rachis. 
Tribe 1 Andropogonee. Spikelets in spike-like racemes, 2 at 
each joint of an articulated rachis, one sessile and hermaphrodite, the 
other pedicellate and either hermaphrodite, staminate; neutral or 
or reduced to the pedicel only. glumes usually 4, the first 2 empty, 
larger and much firmer in texture \than the others; the third usually 
with a staminate flower in its axtl; the fourth hyaline with a fertile 
flower inats azxil, usually awned. Awn usually twisted or geniculate. 
1 IMPERATA Cyrill Pl. Rar. Ic. ii, 26. (1796.) 
Panicle spike-like. Spikelets in pairs on unequal short clavate 
pedicels or one sessile, both perfect, awnless. Outer empty glumes 
clothed with long white silky hairs: third and fourth glumes and 
palet hyaline. Stamens 1 or 2. Stigmas 2. | 
I. Hookeri Rupr. (£fvers Vet. Acad. Stockh. 160. Stems 2-4 feet 
high, simple, smooth, from creeping rootstocks: radical leaves 4-12 inches 
long, the cauline shorter, decreasing upward: ligule short, ciliate: panicle 
nearly cylindrical, erect, 6-12 inches long, sometimes interrupted below: 
hairs depse, straight, about 44 inch Jong, giving the peculiar feathery ap- 
pearance, flecked with the Pp or brown anthers and stigmas. Along 
streams, eastern Oregon and Nevada to California and Texas. 
Tribe 2 Panicex. Spikelets hermaphrodite, terete or flattened 
on the back. Glumes 2-4, when 4 there is sometimes a staminate 
flower or palea in the axil of the third. Axis of the inflorescence not 
articulated; the rachella being articulated below the glumes, -the 
spikelets falling off singly from their pedicels. } 
65 PASPALUM L., Syst. ed. 10, ii, 855. 
Spikes or racemes either solitary, few and digitate or many and 
panicled. Spikelets in 2-4 rows upon one side of a flattened or 
filiform jointless rachis, jointed upon their short pedicels, plano- 
convex, awnless, apparently one-flowered. Glumes 2, nearly 
equal, few-nerved. Flowering glumes roundish or ovate, coria- 
ceous, convex and enclosing the palet. Scales2. Stamens 3. 
Ovary smooth. Grain enclosed in the glume. 
P. distichum L,’Ameen. Acad. v, 391. Rootstock widely creeping, 
perennial: stems 6-18 inches high, clothed below with the somewhat 
crowded sheaths: leaves flat, 2-3 inches long, glaucous, rough above: 
spikes 2, spreading, one sessile, the other peduncled, 1-144 inches long, 
densely flowered: spikelets in 2 rows, ovate, acute, 14¢ lines long: glumes 
8-nerved, more or less pubescent. In moist meadows Oregon to California 
and the southern Atlantic States: also.in Europe. 
3 PANICUM L. Sp. 55. | 
Spikelets 1- or 2-flowered, when 2-flowered the lower one sta. 
