494 GRAMINACEAE. [Panicum. 
A vast genus, 2 hiae tropical or N. American, with a few species spreading into Europe 
and temperate Asi 
Panicle ere, with sessile, one-sided, spike-like branches 
e branches digitate or crowded near ss gabe ae of the 
eee the Uppermos ost not shorter than the 1 
Rhachi 
is of g th a the length 
of the spi ikelet . P. pruriens. 
Rhachis ofspike filiform, nearly terete; spikelets much smaller; 
lowest glume little shorter than the spikelet . P. filiforme. 
Spike-like coated foes in a pyramidal panicle, decreasing 
in size toward the top: 
Spikelets not awned; lowest branches ‘eins: gai distant 3. P. colonum. 
Spikelets awned in the glume; lowes nchescompound 4. P. erus-galli. 
third 
mie compound, with slender branches; aot aw ig exch 
n a distinct pedice 
Two outer glumes iaelvoal or the lower longer: 
igri eis na see 
m upright straight, simple or once divided 5. P. nephelophilum. 
cas Ke sci “bran ching, chaprtngant at each node in a 
zigzag Manner 6. P. cynodon. 
Spikelets hairy: 
Leaves glabrous, go mage cranecis contracted : i 7. P. Beecheyi. 
The entire plant hairy; s plane, panicle 
Spikelets focally ‘obinse, frost small, the second lume 
rather the lon 8. P. affine. 
Spikelets acute, the fire t glume lo 
Hairs gray or silvery ; spikelet sal ied oo aaah 
Plant small, pubescent Sea 9. P. pellitum. 
Plant large, densely hairy o 10. P. cinereum. 
Hairs es esis or mesieniaah gion larger, thira 
glum . P. torridum. 
shew outer ohities une, the lower much band shorter, glabrous; 
brushes 
matic brus! conical glo 
Sem (at least in the pian peo eg caleht and undivided, 
1 ft. or more hi; 12. P. monticola. 
stig short and one PS forking, the erect branches crowded 
tussocks a pede iaceous; leaves short 
evens lanceolate-acu Re eg 13. P. imbricatum. 
Leaves ovate or est lanceolate, obtuse, ‘pectinately 
ciliate at the margins 14. P. isachnoides. 
ews ese species only the four first occur also se other parts of the world, the rem maining 
ten Gok fi or the present be considered peculiar sm flora. — Besides them, the following 
eee, sccidentaly In introdu . with living a is from abroad, nad become established 
in gardens before my departure, and are likely to have escaped to the open county by 
aoe 
atum, Lam. . Brachiaria). — A low prostrate branching glabrous grass 
mee roe leaves. rae of 4—8 short and distant spike-like branches. Spikelets 
, often by a single long cilia. ndia, 
_P. plicatum, Lam. (Sect. Ptychophyllum, A. Braun). — A tall grass, 3—5 ft. high, nearly 
rmost an 
gla lanceolate, contracted at the base and deeply plaited. Spikelets sub- 
on short degen open panicle, th lowe 
on each branchlet generally supported b e long awn-like bristle. From China. 
- P. maximum, sont. (Sect. Vingarta). - "pall ad the preceding one, but the leaves 
Jess broad and no not plaited. Spikelets all pedicellate and without Dristles, in an open 
— In all three ay aaa glume is less than one th 
com panicle. 
the length of the ee 
