293 



CYPERACEAE. 



Key to genera. 



1. Flowers bisexual 

 Flowers unisexual 



2. Flowering glumes many 

 Flowering glumes 1 or 2 



3. Glumes distichous ... 



Glumes spirally arranged 



4. Style 2-fid 



Style 3-fid ... 



5. Rachilla persistent 

 EachiUa deciduous 



6. Nut laterally compressed ... ■ ... 

 Nut dorsally compressed 



7. Eachilla persistent 

 Kachilla deciduous 



8. Style base constricted or articulate 



above the nut ; leaves basal ; flowers 

 umbelled 

 Style base passing gradually into nut 



9. Hypogynous scales present ; leaves 



wanting 

 Hypogynous scales wanting ... 



10. Style base persistent, or deciduous, leav- 



ing no scar ... 

 Style base deciduous leaving protruding 

 scar ; leaves with long white hairs 



11. Hypogynous scales 0, or linear entire 

 Some hypogynous scales or all of them 



expanded ... 



12. Scales 3 or 6, inner broadly obovate ... 

 Scales 2, hyaline elliptic 



13. Style 2-fid 



Style 3-fid 



14. Spikelets panicled 



Spikelets in digitate dense cylindric 

 spikes 



15. Spikelets 1-7-flowered, lowest flower 



alone perfect 

 Spikelets 1-2-flowered, upper flower 

 alone perfect 



16. Hypogynous scales long 

 Hypogynous scales wanting ... 



17. Nut naked 



Nut enclosed in utricle 



18. Spikes corymbose 

 Spikes paniculate 



19. Leaves present ... 

 Plant without leaves ... 



20. Flowers in small sessile axillary clusters 

 Flowers in terminal panicles ... 



