206 
5. C. Olfersianus, Kunth. Umbel very simple, 1 to few- 
rayed ; heads composed of few straw-colored spikelets ; achenium 
oblong, its surface marked with quadrate cells; otherwise re- 
sembling C. flavescens. - Plaquemines Co., La., (A. B. Langlois, 
1882); Mexico, West Indies and eastern South America. 
6. C. polystachyus, Rottb. New Orleans, (Torrey Herba- 
rium ; an old specimen.) Widely distributed in tropical regions. 
Var. Jleptostachyus, Boeckl. (C. microdontus, and C. 
Gatesit, Torrey, C. Texensis, Steud.) Virginia to Florida (Cur- 
tiss, N. A. Plants, No. 3049, part), and Texas, (E. Hall, 676.) 
7. C. leucolepis, Carey, MS., fide Clarke 1. c., p. 61, (not 
of Beeckl.; C. divergens, Chapm., not of HBK.) Quincy, Flor- 
ida. Related to C. pumilus, L., of India. 
8 C. unioloides, R. Br., var. bromoides, Clarke. Spikelets 
much larger than in any of the foregoing species, straw-colored. 
Cienaga, Los Angeles Co., Cal., (J. C. Oliver in Gray Herba- 
rium) ; Mexico, West Indies and South America; the type in 
Australia. 
** Umbel compound. 
9. C. flavicomus, Vahl, Torrey, Ann. Lyc., iii., 253, Boeck- 
eler, not of Michaux. which, according to Mr. Clarke Gicigp. 
71), is C. strigosus, L. Virginia to F lorida ; also in Brazil. 
10. C. Hochstetteri, Nees. (C. flavicomus, Torrey, Bot. Mex. 
Bound. Survey.) Glumes darkreddish brown ; achenium broadly 
ellipsoidal, twice or three times the size of that of the foregoing 
species, which it otherwise resembles. Louisiana (Hale) ; Texas 
and New Mexico (C. Wright, No. 1965) ; also in tropical Amer- 
ica, Australia, India and Africa. 
(B) Sub genus JUNCELLUS, Griseb. 
11. C. levigatus, L. Southern California (Brewer, Lem- 
mon, Wright, Parish, No. 1050.) Widely distributed in tropical 
regions. 
(C) Sub-genus EucyPErRus, Clarke. 
Section 1. Avistati, Kunth. 
* Spikelets digitate. 
_ 12. C. amabilis, Vahl. (C. aureus, aurantiacus and oligo- 
stachyus, HBK; C. glareosus, Liebm.) Sanoita Valley, south. 
ern Arizona, (Rothrock, No. 599, in Expl. and Surveys West of as 
