32  WRIANDRIA. MONOGYNIA. 
lenticular, rather rugose, terminated by the : 
triangular persistent base of the style. | 
4 
Culm obtusely triangular, sometimes nearly terete, — 
sheathed by the carinate leaves at the base, terminating Mm 
.& single involucrate capitulum; leaves of the mvolucrum 
rather large, discoloured at the base, for the most part 
white, (sometimes red!) seed (in D. latifolia) roundish-oval, 
scabrous and indurated, convex on both sides, margineds — 
and crowned with a black, dilated, triangular tubercle. 
Spectres. 1. leucocephala. 2. latifolia, A larger plant, — 
but nearly allied to No. 1. Grows in Georgia, Florida, and 
also in North Carolina, near Wilmington, This species 
appears to be perennial, and the other not.—3. ciliata. 
Oss. The Dichromais so very nearly allied to Scirpus, a8 
‘to be almost destitute of any important discriminative 
character; the form of the seed, and the lunate tubercle 
_ with which it is terminated, the absence of the sete, and 
the sterility of the outer glumes, as Mr. Elliott very just: 
remarks, are all circumstances more or less frequent 19 
the genus Scirpus. It is merely then by habit that we are at 
present to distinguish the Dichroma. (Peculiar to Ame= 
rica.) = 
7. SCIRPUS. Z. (Club- Rush.) ; 
Calix scales chaffy, imbricated on all sides 
in a spike. - Corolla 0. . Style filiform, un- 
bearded, deciduous. Seed 1, naked, or sure 
rounded with involucellate setz or threads. 4 
Culm naked, round, or angular, with a solitary termi- 
Nal spike. or with several spikes, subtended by an invo- — i 
lucrum, and in some species furnished with a leafy culm. 
Srecies. §1. with one terminal spike.—1. S acieularis. 
2. capillaceus. 3. trichodes. 4. simplex. 5. filiformis. 6. 0vd- 
sus. (palustris 8. geniculatus 9 capitatus. 10. tuberculo- 
sus. 11. guadrangulatus. 12, equisetoides.—§ 2. with seve- _ 
ral spikes, and without leaves.—15. debilis. 14. America-- 
nus. 13. mucronatus. 16. lacustris. 17. validus.—§ 3. culm 
leafy at the base—18. minimus. 19. autumnalis. 20. cilia~ 
tifolius. 21. stenopyhllus. 22. coarciatus. 23. sulcatus. —§ 4 
culm leafy —24. ‘maritimus. 25. exaltutus. 26. nitens. 27- 
— Hineatus. 28. divaricatus. 29. polyphillus. 30. Shanoides. 
__ This 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 a. 
-——-SPecies are found in Barbary, also in the warmer region® 
