97 i CXLVII. GRAMINE.Ti:. 



Liteniodes of racemes deeply cupped at the apex. 



Subgenus 1. Cymbopogon. Eacemes 2-nate, terminal on the stems, 

 both together subtended by spathiform sheaths; spikelets differing iu 

 sex and form. 



Boots aromatic 1. A. Iwarancusa. 



Subgenus 2. Arthrolophis. Eacemes 2-uate (1 sessile, the other 

 pedunculate), from si^athiform sheaths ; sessile spikelets alike in sex 

 and form; joints opaque. 



Cupular tips of joints tootlied 2. A. pumilus. 



Iiiternodes of racemes truncate but not cupped at the apex. 



SECT. A. ISOZYGI. Sessile spikelets of all the pairs alike in sex 

 and form. 



Subgenus 3. Hypogynium. Eaceme solitary, pedunculate, in the 

 axil of a spathiform leaf-sheath ; joints and pedicels obliquely truncate 

 at the apex, opaque ; pedicellate spikelets like the sessile. 



Lower invol.-glume pitted 3. A. foveolatus. 



Subgenus 4. Amphilophis. Eacemes 2 or more, fasciculate or panicu- 

 late, all pedunculate ; joints of the raceme many to few, like the pedicels, 

 linear, compressed, with a translucent median chaunel and thickened 

 margins (except A. concanensis). 



Racemes with many pairs of spikelets. 



Racemes digitate or fasciculate, not paniclecl, the lower 

 longer than the rhachis of the inflorescence. 



Lower invol.-glume of sessile spikelets villous below 

 the middle. 



Lower invol.-glume not pitted. 



Upper invol.-glume mucronulale 4. A. compressus. 



Upper invol.-glume obtuse 5. A. Woodrowii. 



Lower invol.-glume pitted 6. A. pertusus. 



Lower invol.-glume of sessile spikelets glabrous be- 

 low the middle (sparsely silky in A. ensiformis). 



Nodes of stem densely bearded 7. A. Kuntzeanus. 



Nodes of stem glabrous. 



Leaves reaching ^ in. broad 8. A. ensiformis. 



Leaves reaching | iu. broad 9. A, concanensis. 



Kacemes panicled, the lower branches shorter thau the 

 rhachis of the inflorescence. 



Non-odorous ; sheath s terete . . ., 10. A. intermedius. 



Aromatic; sheaths compressed IL A. odoratus. 



Racemes small, of 1-3 pairs of spikelets, often reduced to 

 3 spikelets, 1 sessile and 2 pedicellate. 



Stems more or less sufTruteseent below, slilT, erect, 

 ytems often proliferously branched; nodes of .stent 

 glabrous ; leaves reaching \ in. broad ; callus 



shortly bearded 12. A. assimilis. 



Stems not proliferously branched ; nodes of stem 

 bearded ; leaves reaching ^ iu. broad ; callus 



densely villous 13. A. Hugclii. 



Stems decumbent and interlaced, very weak, (lliform . 14. A.fiUculmis. 



Subgenus "). Soughum. Eacemes panicled, all pedunculate; rhachis 



