Urochloa .] clvii. gramineje (Stapf). 587 
parallel states, one with glabrous, the other with pubescent spikelets, but 
otherwise indistinguishable, runs almost through the whole genus. To this 
may be added the presence of a submarginal fringe in the lower floret, almost 
normal in some and very rare in other species, and apparently in no case corre- 
lated with other characters* I have abstained from giving these states varietal 
names. They may, if it is desirable to designate them briefly, be distinguished 
as forma spiculis glabris or forma spiculis pubescentibus or fimbriatis. 
Spikelets 1J-24 lin. long ; lower glume ovate to lanceolate 
or oblong, | the length of the spikelet to as long as the 
spikelet, nervation always distinct except sometimes 
in 8 {TJ. rudis). 
Racemes normally 2 ; rhachis strap-shaped, herbaceous, 
with the margins curving over the bases of the 
spikelets ; spikelets lanceolate-ovate, acutely acumi- 
nate, 2 lin. long, often reddish ; glumes subequal, 
with about 7 percurrent and several shorter nerves 
in the upper part ... ... ... ... ... 1 . U. bifalcigera. 
Racemes normally more than 2, up to oo ; rhachis 
subtriquetrous with a low facial angle to tri- 
quetrous. 
Lower glume almost as long as the upper, more or less 
truncate or obtuse, 3- or sub-5-nerved, frequently 
with 1 or more bristles from a supracentral 
tubercle ; spikelets 2-2J lin. long, subulate- 
acuminate. 
Annual ; spikelets broad-ovate ; lower glume more / 
or less truncate with the lateral nerves, per- 
current ' ... 2. U. trichop'us. 
Perennial ; spikelets elliptic -oblong to oblong ; lower 
glume obtuse with the lateral nerves not 
percurrent and usually inarching and anasto- 
mosing with the midnerve below the tip ... 3. U. pullulans. 
Lower glume -f— J the length of the spikelet and much 
narrower than it above the clasping base. 
Lower glume over ^ the length of the spikelet, lanceo- 
late, 5-7 -nerved. 
Spikelets 24 lin. long ; upper glume 5-nerved ; 
annual ... ... ... ... ... ... 4. U. bradiyura. 
Spikelets l |—2 lin. long ; upper glume 7-nerved ; 
’ perennial ... ... ... ... ... 5. TJ. bolbodes. 
Lower glume less than \ the length of the spikelet. 
Spikelets subulate-acuminate, hispid ; lower 
glume broad-ovate to ovate -lanceolate, acumi- 
nate, up to ^ the length of the spikelet, 3- or 
sub-5-nerved ; annual ... ... ... 6. TJ. echinolcen - 
[pides. 
Spikelets acutely acuminate to acute : lower glume- 
very shortly acute or subacute from a broad 
clasping base, J the length of the spikelet. 
Spikelets 2 to over 24 lin. long ; lower glume 
not over 4 the length of the spikelet. 
Annual ; spikelets ovate to elliptic-oblong 
in outline, acute, turgid ; upper glume 
7-11 -nerved; leaf -blades linear -lanceo- 
late to lanceolate, about 2-6 in. by 4-6 
lin., mostly more or less hairy. 
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