48 



9. Culms 2-3 noded f-2 ft. long. Panicle i-2 in. long ... 10 

 Culms 3-7 noded 2-6 ft. long. Panicle 2-1-2 in. long... 11 



10. Blades setaceously convolute £-f lin. broad ... S. perennis. 

 Blades folded or flat 1-2 lin. broad (unfolded) 



S. flabellata. 



11. Culms very rough for a long distance. Bristles coarse. 



S. rigida. 

 Culms scabrid close to panicle only. Bristles slender. 



S. aurea. 



SPOROBOLLS. 



1. Rachilla produced into a short bristle subtending the 



floret S. sufotilis. 



Rachilla long, not produced 2 



2. Culms very many noded. Leaves often apparently oppo- 



site along culm S. pungens. 



Culms 4 noded or less 3 



3. Spikelets 1|-2J lin. long. Panicle ovate or spike-like, 



rather dense S. eenlrifugus. 



Spikelets \-i\ lin. long. Panicle lax, or if dense then 

 long and narrow 4 



4. Culms from a few inches to 1 ft. long, slender, few 



noded 5 



Culms 2-4 ft. long, rather robust, 2-4 noded 11 



5. Culms with a dense tussock of fibres at base ... 



S. feslivus var. stuppeus. 

 Culms not with a flense tussock of fibres at the base 6 



6. Valves 3-nerved, exceeding the glumes 7 



Valves 1-nerved, about as long as upper glume ... 9 



7. Panicle contracted, somewhat spikelike. Spikelets pallid. 



1 lin. long S. albicans. 



Panicle effuse or lax. Spikelets purplish, §-f lin. long 8 



8. Culms 2-6 in. long, 1 noded. Testa mucilaginous ... 



S. tenellus. 

 Culms 9-12 in. long, 2-3 nocled. Testa not mucilaginous. 



S. acinifolius. 



9. Blades denticulate, fimbriate S. discosporus. 



Blade margins smooth 10 



10. Rhizome creeping. Barren shoots very short, cylindric, 



distinct S. ludwigii. 



Rhizome oblique. Barren shoots much longer, in com- 

 pact tufts S. ioclados. 



11. Upper glume slightly exceeding £ valve S. indicus. 



Upper glume equalling or slightly exceeding the valve 12 



