412 CLVI. CYPERACE (CLARKE). | Pimbristylis. 
**DICHELOSTYLIS.—Stem with several (usually very many) spikelets ; style 2-fid ; 
lower fertile glumes in many spirals. 
Nut linear-oblong ; glumes aristate .. c . 3. F. dipsacea. 
Nut obovoid. 
Style-base with a ring of pendent hairs nearly a¢é 
long as the nut = 5 : . 3&3. F. squarrosa. 
Style-base without long pendent hairs. 
Nut conspicuously 8-ribbed lengthwise. 
Glumes boat-shaped ; spikelet slightly 
polygonal : ° : : A eh dk 
Glumes concave; spikelets terete 7. 0 
Nut smooth, sometimes obscurely reticulate, 
scarcely ribbed. 
Stem hairy at the top; spikelets euboid . 6. F. pilosa. 
Stem glabrous at the top; spikelets ovoid 
to cylindric. 
Glumes at the upper half of the back grey ; 
by reason of minute depressed hairs, 7. F. ferrugined. 
Glumes on the upper half of the back 
labrous. : 
Spikelets 15-20 ; glumes obtuse . 8. F. longiculmis. 
Spikelets 60-80 ; glumes acuminate . 9. F. nigritana. 
eT RICHELOSTYLIS.—Stem with several or many spikelets ; style 3-fid; lower 
fertile glumes in many spirals. 
Spikelets not clustered. 
Spikelets usually less than 12 to the umbel, 
except in F. cioniana. 
Plants with fine long white hairs. 
Nut with transverse wavy lines. 
Nut large, whitish ; spikelets 3-14 S102 r: exilis. 
Nut smaller, yellowish ; spikelets 10-25 12. F. eioniana. 
Nut not wavy, smaller than in F. evilis . 11. F. Hensti. 
Plants without long white hairs, very nearly 
glabrous. 
Glumes much acuminate; spikelets sub- 
acute ‘ : P yi f . 18. F. tenera. ‘ 
Glumes obtuse ; spikelets obtuse, ellipsoid . 14. F. schweinf' urthiana- 
Spikelets nearly always more than 12 to the 
umbel. 
Nut longitudinally striated, with transverse 
bars between the striations. 
Spikelets broadly ellipsoid, obtuse . . 15. F. miliacea. ; 
Spikelets ellipsoid-lanceolate . . «16, ¥. quinquangularis- 
Nut not longitudinally striate 
Stem at the top subequally 4-angled or 5- 
angled. 
Leaves very short, rarely 1-2 in. long . 17. F. subaphylla. 
Leaves half the length of the stem . 18. F. seabrida. 
Stem at the top very much flattened . 19. ¥. complanata. 
Spikelets, at least many of them, clustered. 
Spikelets very numerous in a compound umbel 
tchotoma. 
or head . 4 - ; : : 2 20: 8: obtusifolia. 
Spikelets 1-4 to each stem, subeapitate . . 21. F. otc deen de stile 
*% A BILDGAARDIA.—Lower fertile glumes distichous or nearly so; upper 
glumes spirally placed; spikelets not clustered. 
