Cyperus.'] 
CYPEBACEJ2. 
409 
oblong-navicular, subacute, much imbricated, bright red-brown, with a 
green keel. Achene elliptic, dark brown, half as long as the glume. 
C. foliosus, Willd.; Kunth , Enum. ii. 11. C. Thouarsii, Kunth , Enum. 
ii. 12. 
Mauritius, in woods at the foot of the mountains. Also Bourbon and Mada- 
gascar. 
7. C. alopecuroid.es, Rottb.; Kunth , Enum. ii. 19. Perennial. 
Stem 3-4 feet long, acutely triquetrous. Leaves linear, in. broad. 
Clusters of spikelets very numerous, cylindrical, in compound umbels 
bracteated by about a dozen linear leaves that reach a length of a foot 
or more, the outer umbels on 6-9 in. peduncles ; spikelets \ in. long, 
10-20-flowered. Glumes drab, oblong-navicular, subacute, much im- 
bricated -Jg- in. long. Achene obovoid, smooth, shining nearly as long 
as the glume. 
Seychelles, in damp woods of Mahe, Horne , 221 ! Through the tropics of the 
Old World. 
8. C. tremulus, Roir. ; Kunth , Enum. ii. 16. Perennial. Stems 
2-3 feet long, stout, triquetrous. Leaves nearly as long as the stem, 
linear, ^ in. broad. Clusters very numerous, in a very compound 
umbel, the outer peduncles half a foot long ; spikelets in. long, 20- 
40-flowered. Glumes T V- tV in. long, much imbricated, bright reddish- 
brown, with a green keel, and a distinct hyaline border at the top, 
obtuse. Achene oblong, dark brown, half as long as the glume. 
C. expansus, Bojer , JELort. Maur. 380, not Kunth. 
Mauritius, in swamps and by the side of streams. Also Madagascar, Tropical 
Africa and Asia, and probably conspecific with the American C. Jiavicomus, Michx. 
9. C. exilis, Willd. ; Kunth , Enum. ii. 50. Annual, densely 
tufted. Stems 2-3 in. long, slender, triquetrous. Leaves subulate, 
shorter than the stems. Spikelets 3-5 in a sessile head, bracteated by 
2-3 linear-subulate leaves \-l\ in. long, each a- in. long, lanceolate, 
15-20-flowered. Glumes in. long, ovate-navicular, subacute, dark- 
brown, much imbricated, closely distinctly many-ribbed. Achene 
obovoid-triquetrous, half as long as the glume. 
Mauritius, on the Pouce, Sieber , Herb. ii. No. 29 ! Gardner ! Also Madagascar. 
10. C. dubius, Kottb. Gram. 20, t. 5. Perennial. Stems densely 
tufted, rather thickened at the base, 4-12 in. long, triquetrous. Leaves 
linear, shorter than the stems. Spikelets 20-40, lanceolate, all sessile in 
a single dense globose terminal head, bracteated by 2-3 linear leaves 
1-4 in. long, each £ in. long, 6-8-flowered. Glumes brownish-drab, 
7 x j in. long, much imbricated, ovate-deltoid, subacute, wiih several dis- 
tinct ribs. Achene obovoid-triquetrous, dark glossy brown, half as 
long as the glume. C. kyllingioides, Vahl ; Kunth , Enum. ii. 94. C. 
