CYPERACE^. (sedge FAMILY.) 505 



8. SCIRPXJS. Tubercle none : culms mostly leafy at the base or throughout : spikes com- 



monly few or many : iiorianth of 3 - G bristles. 



9. EUIOI'UOKUM. Perianth of numerous long and woolly hairs : otherwise like Scirpus. 



• • • Perianth none : stylo tumid at the base. 

 ■*- Scales imbricated in several rows : i^pikea terete. 



10. FDIBKISTYLTS. Style deciduous : stigmas 2 : nut lenticular or globose. 



11. TIUCIIKLOSTYLIS. Style deciduous : stigmas 3: nut 3-angled. 



12. ISOLKPId. Style persistent at the base : stigmas 3 : nut 3-augled. 



•<- ^- Scales imbricated in 2 rows : spike compressed. 



13. ABILG AARDIA. Style 3-cleft, jointed to the 3-angled nut. 



Tribe IV. RH YNCHOSPORE.3E. — Flowers perfect or polygamous : spikclets com- 

 monly few-flowered : scales one to each flower, imbricated in few -several rows, the lower 

 ones empty, the upper mostly sterile : perianth bristly', or none. 



« Perianth bristly (occasionally wanting in Khynchospora). 



14. RIIYNCHOSPORA. Style 2-eleft, dilated and persistent at the base : nut lenticular or 



globose. 



15. CERATOSCIKENUS. Style entire or minutely 2-cleft, the lower half persistent : nut flat. 



16. CIIiETOSPORA. Style 3-cleft, deciduous : nut 3-angled : spikelets terminal. 



« * Perianth none. 



17. PSILOCARYA. Spikes terete, many-flowered, cymosc : flowers perfect. 



18. DICIIROJIE\.\. Spikes compressed, capitate*: most of the flowers imperfect. 



19. CLADIUM. Spikes few-flowered, only the uppermost flower perfect : nut globose. 



Tribe V. SCLERIE.^. — Flowers monoecious : sterile spike many -flowered : scales one 

 to each flower, imbricated in furrows : fertile spike l-flowered, with two or more scales : 

 perianth none. 



20. SCLERIA. Style 3-cleft, deciduous. Nut bony, globose or 3-angIed. 



Tbibb VI. CAR1CE.S3. — Flowers monoecious, very rarely dioecious : sterile and fertile 

 flowers on the same spike, or on separate spikes : scales one to each flower, imbricated 

 in few - many rows : nut enclosed in a sac : perianth none. 



21. CAREX. Bristles within the sac none. Spikes a.xillary and terminal. 



1. CYPERUS, L. 



Spikelets 2 -many-flowered, commonly flat or compressed. Scales imbricated 

 in two opposite rows, often decurrcnt on the jointed rachis, deciduous. Perianth 

 none. Stamens 1-3. Style 2 - 3-cleft, deciduous. Nut lenticular or 3-angled. 

 — Culms 3-anglcd (rarely terete), jointless, leafy or occasionally sheathed at 

 the base. Spikelets numerous (rarely 1-2), disposed in single or umbellate 

 heads or spikes, and surrounded with a leafy involucre. Eays sheathed. 



§ I. PYCREUS. Style 2-cleJl : nut lenticular: spikes more or less umbelled. 

 Annuals: spikclets linear or linear-ollonf) , flat, many- (10-40-) flowered: 

 rachis narrowly margined: scales compressed-keeled, 5-nerved. 



* Spikelets clustered on the common rachis. 



1. C. flaveseens, L. Umbel sessile or of 2-4 rays, shorter than the 



spikelets; spikclets 3 -several in a cluster, ohlong-linear, acute, spreading, 20- 



30-flowered ; ^ales yellowish brown, ovate, obtuse, appressed ; rachis margined ; 



stamens 3; nut orbicular, black, smooth and shining; culms clustered 4' -10' 



43 



