62 TRIANDRIA. MONOGYNIA. ctperus. 



7. C. strigosus L. : epikelets linear, compressed, acute, 

 alternate ; glumes lanceolate, nervose ; umbel simple, or 

 compound ; involucrum about 6 leaved, margin pube.-^cent 5 

 root globose. Sp. pi. 69. H' il I d. Spec, I. p. 8 i . excl. spi, 

 Mich. Fl.l. p. 28. Vuhl Ermm. II. p. .i58. Pursh 

 Fl. I. p. 32. Elliott SA-. 1 . p. 70. Mukl, Gram. p. 2 K 

 Roem. ^ Schult. II. p. 214. 



Root about half an inch in diameter, with descending fibres. 

 Culm triquetrous, a foot or two feet high. Leaves broatl-linear, 

 nearly as tall as the culm, rough on the margin. Umbel ge- 

 nerally simple, 3 — 4-rayed ; rays about 2 inches long, unequal, 

 sheathed at the base, triquetrous ; sheaths bifid. Involucrum 

 5 — 6- (3 — 9 Mu/il.) leaved; leaves alternate; the exterior 

 ones 3 times tlie length of the rays. Spikelets 10 — 12-floweredj 

 an inch or more long, of a yellowish colour. Racliis flex- 

 \ious. Stamens 3. Style generally 3-clell (rarely 2-cleft.) 

 Seed oblong, triquetrous. 



Hab. In low wet grounds; common. August — September, 



?y, C. tenuis Swartz? spikes lanceolate, acute, 10— 

 17-flo\\ered; umbel simple ; involucrum 3 — 4-leaved, longer 

 than the rays ; root tuberous. M uh I. Gram. p. 22, 

 Swartz Prod. p. 20.? 



Culm triquetrous, slender, about a span high. Radical leaves 

 about a foot high. Rays of the umbel unequal. Sfiikes yel- 

 lowish, bracteate at the base. Rac/iis articulated. Glumes 

 nervose. Style o-c\th. Muhl. 

 Had. In Pennsylvania. Muhlenberg. 



I am not certain that I have observed this species, and have 

 therefore adopted Mu hlen b erg^s description entire. The 

 North- American plant will, probably, hereafter be found dis- 

 tinct from that of the West-Indies, which has crowded, sub- 

 ulate spikelets, a 6-leaved involucrum, and a filiform culm. 



9. C. phymatodes jM 11 h I. : umbel simple or decom- 

 pound ; involucrum 3 — 9-leaved ; three of the leaves very 

 long; peduncles compressed; spikelets distichous, linear; 

 the lower ones branched, about IS-flowered; sides rather 

 convex ; glumes oblong, obtuse ; radicles tuberous at the ex- 

 tremities. M u h I. Gram., p. 23. C. repe.ns Elliott Sk. 

 I. p. 69. C. tuberosus Pursh FL I. p. 52, but probably 

 not of V ahl. 



Root creeping; the fibres terminated by small tubers about the 

 size of a pea. C«/m triquetrous, a foot or more high. Leaves 

 mostly Situated at the base of the culm, a little recurved, 

 very smooth, carinate, sheathing at the base ; the radical ones 

 broader, U7nbel generally simple; of 4 or 5 unequal rays 

 with bifid ochrete at the base. S/iikelets elongated, opposite 

 and alternate on the upper part of the rays, of a yellowish co- 



