32 TRIANDRIA. MONOGYNIA. 



lenticular, rather rugose, terminated by th« 

 triangular persistent base of the style. 



Culm obtusely triangular, sometrnes nearly terete, 

 sheathed by the carinate leaves at the base, terminating in 

 a single involucrate capltulum; leaves of the involucrum 

 rather large, discoloured at the base, for the most part 

 White, (sometimes red!) st-ed (in D-latifolia) roundish-oval, 

 scabrous and indurated, convex on both sides, margined, 

 and crowned with a black, dilated, triangular tubercle. 



Species. 1. leucocephala. 2. latifolia. A larger plant, 

 but nearh allied to No. 1 Grows in Georgia, Florida, and 

 also in North Carolina, near Wilmington, This sptxies 

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



Obs. The Dichroma is so ver\' nearly allied to Scirpxis, as 

 to bf almost destitute of any impt)rtant discriminative 

 character; the form 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, are all circumstances more or less frequent in 

 the genus Scirpvs. h is merely then by habit that we art? at 

 present to distinguish the Dichroma. (I'eculiar to Ame- 

 rica.) 



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



Ccdix scales chaffy, inibrirated on all sides 

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

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

 rounded with involucellate setae or threads. 



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

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

 lucrum, and in some species furnished with a leafy culm. 



Species. § 1. with one terminal spike. — 1. S acicvlaris. 

 2. capillacetis. 3. trichodes. 4. simplex. S.JHiformis. 6. ova- 

 ius. 7. palustris 8. geni ctdaHis . 9. capltaiiis. 10 tuberculo' 

 sjis. 11. giuidrangulatiis 12, eguiseioides. — § 2. with seve- 

 ral spikes, and wnhout leaves. — 12. debilis. 14; .America- 

 nus, 15. mucronatus. 16. lacustris. 17. validus. — § 3. culm 

 leafy at the base — 18 minimns. 19. cmUimnalis. 20. cilia' 

 tifoUus. 21. stenopyhlhis. 22 coarctatus. 23. snIcatiis.—§ 4. 

 culm leafy — 24. vmritimns. 25. e.xaltatus. 26. niiens. 27- 

 bneatus. 28. divaricatus. 29. polyphillus 30. Shcenaides. 



Tliis very numerous genus appears to be predominant 

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

 and at the Cape of Good Hope, as well as Europe; a few 

 Species are founU ia Barbary, also in the warmer regions 



