OKDER CXLI. CVn KACK.Ti. 555 



ANALYSIS. 



1. Aclieniura incloeed in a sac (pcrigynium) Carex, 14 



Aohcnium not inclosed in a sac '. . . 2 



2. Flowers perfect 3 



Flowers not perfect Scleria. i.j 



3. Flowers witli hypo<.n,'nons setae (bristles) 4 



Flowers without liypogynous seta; 9 



4. Flowers distichous (2-rowed) Dulichiuin, 12 



Flowers not distichous 5 



5. Seta; capillary C 



Setffi not capillary Fuirena, 7 



6. Seta; consisting of numerous hairs Eriophorum, 6 



Seta; of 5— many bristles 7 



7. Spikelets few-flowered ; style bifid Rhyncofpora, 11 



Spikelets usually many-flowered 8 



8. Plants with no leaves Eleocharis, 4 



riants with leaves iScirpu^, 5 



9. Flowers distichous 10 



Flowers imbricate 12 



10. Spikes l~^3-flowered 11 



Spikes more tlian 3-flowered C'jperus, 1 



11. Style bifid K>/Uin<ji<i, 8 



Style trifld Marinciis, 2 



12. Stvle trifid EleochariJi, 4 



Style bifid 13 



13. Stamen 1 Isoleph, 8 



Stamens usually more than 1 14 



14. Leaves of the involucre 5 or more DichroDiena, 10 



Leaves of the involucre 2—5 Fimbristijlis, 9 



Tribe L— CYPE'REJE. 

 Flowers perfect, 2 -ranked. 



Genus I.— CYPE'RUS. 3— L 

 (From cypris, a name of Venus.) 



Spikelets compressed. Glumes imbricate, in 2 row.>^, eacli 

 nerally inclosing a flower. Setcc none. 



§ 1. Sli/le trifid ; acheniion compressed. 



1. C. FLAVEs'cENS, (L.) Stem nearly terete, shilling. Leaves lineai, 

 sheathing the stem at the base. Umbels coinj>()Un<l ; spikelets crowil- 

 ed, lanceolate. Stamens Z. — U. July — Oct. Wet soils. 8 — 12 in. 



2. C.rivula'ris, (Kunth.) /S'/o/i triangular, glabrous. Xrair* shorter 

 than the stem, nearly glabrous. Umbels of 3 — 4 rays ; rays unequal ; 

 involucre 3-leavecl, exceeding the umbel in length. Spikes LH) — 'J5- 

 flowered, compressed, broadly linear; scales ovate, obtuse; stanieiis *J. 

 — Geoi-gia. River banks. 



3. C. HOLOscRi'cEUS. Stcm triangular, smooth, leafy at the ha-e. 

 Leaves longer than the culm, membranaceous, flat ; margins (.eabiou-. 

 Umbel vihovit 10 rays; rays unequal ; involucre G-leaved, long; spikes 



ge 



