254 OXLIIL CYPERAOEX. [ Cyperus. 
eus. Spikelets flat with navicular keeled peto. Style usually 
cr. I. Pyer 
sig Nut more or less flattened, with one edge next the rhachis 
Nut ovate or obovate, not exceeding half the length of 
ume. 
Dwarf tufted annual. Spikelets in loose clusters in a 
umbel of 3 to 6 rays. Keel of the glumes pir 
sme — a straight or recurved point the sides ; 
1. 0. pumilus. 
eriy mostly under 1 ft. Spikelets 3 to e lines 
road, in a single loose cluster or r 2 
short umbel-rays. Glumes broad, dibus. te idis - i 
dar i 2. C. eragrostis. 
Annual or perennial much under 1 ft, i ‘Spikelets 1 1 to 
few rays or all in one cluster. ‘Gomes ae 
obtuse, very pale or yellowish gree . 9. C. flavescens. 
Perennial, mostly under 1 ft. Spi kelots narrow, in 
or c eap all sessile or in an umbel.of few 
ra Glumes Mor narrow, almost acute, the 
a i of a pale bro uis . 4. C, globosus. 
nnial 1 to 2 ft. “Spikelets : ines Droad, the 
pem — in - From ine ma s broad, 
rather Sello . 5. C. unioloides. 
Nut M sinl not exteling 1 balf the dengih of the glum 
Spikelets very numerous, in a dense im 
compoun vl porius BEST with 2 or 3 elongated 
Nut broad, almost as long as the glume, ‘all perennial. 
Spikelets ence pea and disichous sig the — 
of a large compound um "E 
6. C. polystachyus, 
7. C. flavicomus. 
Secr. II. Seces, Spikelets flattened but usually thick. Style 2-cleft or arp 
3-cleft. Nut ovate or broad, with a flat or concave face next the axis, the back conver 
Mee ABER jia gle. 
Spikelets very numerous and closely packed in a small 
compound head with an id pen of Tong l leafy (te 
Ares. fun Involuere of several bracts, iip 
ened , : . 8. C.pygmous. 
Perennial, ga 1 ft, hi high. Involaere of 2 very long 
ricarp Sa at the base into a white 
aig: or 3-lobed mass . €. cephalotes. 
Spikelets oe A a single cluster, apparently ‘lateral, the 
involucral bract con BIA She's tem 10. €. levigatus. 
Spikelets in clusters & dense dicen of several short 
rays. “Style . 11. C. platystylis. 
Pes ts small num umerous, in dense spikes along the rays des. 
alarge compound umbel. Stems 3 to 4 ft. . 12. C. alopecurot 
Secr. III. Eucyperus. Spikelets s flat, the rhachis s rig or rarely with ane 
ceedingly narrow border. Style 3-cleft. Nut equally trig 
Spikelets numerous, in a single small dense ope head, 
; ien an pees of long slender brac 13. €. pulchellus. 
e : d a ina ies sessile clus- 
litary. Glumes o sho 
iyesieserquir ai a mania tamm 
nual not exceeding 2 in. Spikelets 1 or 2 apparentl 
lateral, one involucral bract pesti the stem / 14. C. tenellus. 
