32 TRIANDRIA. MONOGYNIA. 



lenticular, rather rujs^ose, terminated by the 

 triangular persistent base of the style. 



Culm obtusely triangular, somet mes nearly terete, 

 sheathed by the carinate leaves at the base, terminating in 

 a single involucraie capitulum. leaves of the involiicrum 

 rathe)- large, discoloured at the base, for the njost part 

 white, (.sometimes red!) sred (in I) latifoliii) roundish-oval, 

 scabrous and indurated, convex on both sides, margined, 

 and crowned with a black, dilated, triangular tubercle. 



Species 1 lencocephala. 2 latifoUa. A lar.t:er plant, 

 but nearl\ allied to No. 1 Grows ui Georgia, Florida, and 

 also in North Carolina, near Wilmington. This spi cies 

 appears to be perennial, and the other not. — 3. ciliata. 



Obs. The Dichroma is so very nearly allied to Scirpus, as 

 to be almost destitute of any important discriminative 

 character; the ibi-m of the seed, and the lunate tubercle 

 \vith which it is terminated, the absence of the setae, and 

 the sterility of the outer glumes, as Mr. Klliott very just- 

 ly remarks, ai e all circumstances more or h^ss fi'equent in 

 the genus Scirpus. I- is merel\ tlien b\ h?.bit that we are at 

 present to distinguish the Dichroma. (Peculiar to Ame- 

 rica.) 



47. SCIRPUS. L. (Club-Rush.) 



Calix scales chaffy, imbrirated on all sides 

 in a spike. Corolla 0. /Style filiform, un- 

 bearded, deciduous. Seed 1, naked, or sur- 

 rounded with involucellate setse or threads. 



Culm naked, round, or angular, with a solitary termi- 

 nal spike, or with several spikes, subtended by an invo- 

 lucruni, and in some .-.pecies furnished with a leafy culm. 



Species. §1 v. itii one terminal spike. — 1 S aciciilaris. 

 2. capill'iceus. 3. trichodes 4. simplex. S.Jiliformis 6. ova- 

 tus. 1 . pahtstris \6. genicvhitiis 9 capitatus- 10 titberculo- 

 siis. 11 qvadvangtilatus \2. equisetoides. — § 2. vv it h seve- 

 ral spikr s, and wiihout leaves. — IC debilis. 14 America' 

 mis. 15. mvcronatns. 16. lacvstris. I7.vcduhts. — § 3. culm 

 leafv at tl'e base — IB minimus. 19. autumnalis 20. cilia- 

 iifolius.2l. stenopyhlhis. 2 coarciaius. 2'3- stilcatiis. — §4. 

 cuhi) le. fj — 24. mi.ntimus. 25. exaltucvs. 26. nii.ens 27. 

 linedtus. 28. divaricatus. 29. polyphillus 30. Shoeuoides. 



Tl.is vt ry numerous i^eiuis appears to be predominant 

 in the varmer and northern parts of America, in India, 

 and at the Cape oi" G-iod Hope, as well as Europe; a tew 

 species are found in Baibary, aiso in the warmer regions 



