270 North American Cyperacece. 



Hab. In Louisiana, Jussieu. 



Obs. With this plant I am unacquainted. 



23. Cyperus Baldwinii. 

 Culm obtusely triangular ; involucre 6 — 9-leaved ; umbel of 

 6 — 12 rays ; heads globose ; spikelets narrow-lanceolate, com- 

 pressed, acute, 5 — 8-flowered, spreading; scales ovate-lanceo- 

 late, acute, appressed ; interior scales conspicuous, hyaline ; 

 nut obovate. 



Mariscus echinatus, Elliott, sk. 1. p. 75, t. 3. f. 1. (excl. syn.) 



Cyperus globosus, Baldw.! Mss. (not ofAllioni.) 



Culm 1 — 2 feet high, smooth, somewhat tumid at the base. Leaves 

 shorter than the culm, 2 — 3 lines wide, scabrous on the margin. Rays 

 of the umbel somewhat erect, 1 — 3 inches long. Ochrece mucronate. 

 Involucre more than twice as long as the umbel. Heads 6 — 8 lines in 

 diameter, depressed, globose, formed of about 40 aggregated spikelets, 

 which spread horizontally but are not refracted. Spikelets 3 — 4 lines 

 long, attenuated to a sharp point. Rachis broadly winged with the per- 

 sistent inner scales. Scales membranaceous, somewhat scarious on the 

 niEurgin ; the two lowest short, ovate, and empty. Stamens 3. Style 3- 

 parted. Nut narrowed at the base, half the length of the scale. 



Hab. In cultivated lands ; very common in the Southern 

 States. South Carolina and Georgia, Dr. Baldwin! and Elliott; 

 Middle Florida, Dr. Chapman!; New Orleans, Dr. Ingalls! 



Obs. This plant differs from the C. ovularis, to which Mr. 

 Elliott referred it, in its more numerous and looser heads, 

 and compressed, many-flowered spikelets. In many respect- 

 it resembles C. Grayii. 



24. Cyperus compressus, Lijin. 

 Umbel simple (rarely compound,) or wanting ; rays spread- 

 ing ; spikelets in a loose head, or aggregated in a somewhat 

 digitate manner, lanceolate, somewhat convex and ancipital, 

 many-(12 — 40) flowered ; rachis winged with the interior scales ; 

 scales ovate, acuminate, carinate, indistinctly nerved j nut obo- 

 vate, triquetrous, polished ; root fibrous. 



