CXLII. GRAMINER. 431 
towards the base, others merely scabrous. 
Otherwise as in preceding. . . . . . 10. PENNISETUM. 
Inyolucre becoming very hard, (composed of 
the thickened lower glumes of the spike- 
lets, which are united at their base,) en- 
closing 4-6 or more spikelets placed at the 
top of acommon pedicel. Scales absent. 11, ANTHEPHORA. 
Subtribe 2. TRisTEGInEm. 
Spikelets small, scattered along the branches of 
a compound panicle. Awnslender . . . . 12. ARUNDINELLA. 
Spikelets large, 1-3 together at the end of the 
branchlets. Awn strong, 13-2 inches long . 13. Tristacnya. 
Subtribe 3. ANDROPOGINER. 
a. Spikelets apparently 1-flowered. Lowest glume 
absent. Barren glume with a simple not 
twisted awn. Panicle dense, spike-like. . 14, PrRoris. 
B. Spikelets evidently 2-flowered, 3 glumes pre- 
sent. 
* Spikelets in pairs equally fertile. 
+ Glumes all awnless. 
Spikelets indented in the axis of a flattened 
rachis. . . 15. HEMARTHRIA. 
Panicle dense, cylindrical, “lowest glumes 
thin . . 16. IMPERATA. 
Panicle much divided, dense lowest glume 
very thick . . . . . . 17. ERiocurysis. 
tt Flowering glume with a twisted awn. 
One fertile and one neuter flower in each 
spikelet. 
Panicle much divided. Main rachis not 
jointed . . 18. Eunatia, Trin. 
Panicle composed of 3- 5 “rather slender, 
spike-like branches . . . . 19. Ponuinta, Trin. 
One fertile and one male flower in each 
spikelet. . . . . . . 20. SPODIOPOGON. 
** Spikelets m pairs, only one fertile. 
Pedicelled spikelet fertile, lowest one sessile, 
Tale. . . 21, TRAcHYPOGON. 
Pedicelled spikelet, ‘male or ‘neuter, seldom 
awned. 
Fertile spikelet not awned. 
Lowest glumes of fertile spikelet empty, 
taper-pointed or 2-fid . . 22. ELIONURUS. 
Lowest glume of fertile spikelet male, 
glume of one or both spikelets pro- 
longed into a very long beak . . . 23. Vossta. 
Fertile spikelet awned, almost sessile. 
Fertile spikelet cylindrical. Upper 
flower female, strongly awned, pedi- 
cellate ; male flat. Spike simple, soli- 
CRE), co ce yn ene eee ene et te ERT RROPOGONS 
Fertile spikelets generally flattened, with 
lowest glume prominently nerved in 
jointed spikes or spike-like branches. 
