308 TÀIANDRIA MONOGYAIAT Copes 
- ‘This'is by far the largest species on the coast of Coromandel. It 
e in sweet standing water. : id 
* Root fibrous.--Culms erect, from six to twenty feet high, elt 
thick in proportion, naked, except near the base, three-sided, angles 
sharp, rigid and ‘scabrous, so as to cut the hand readily, other parts 
pretty smooih.— Leaves sheathing, in small plants, as long as the 
culm, abdut an inch in diameter at the broadest part, triangularly 
concave, wih the keel and margins sharply serrate —Umbel. termi- 
nal, dec: mpound, erect, small for the size of the plant, being only 
about à ivot nigh in middle-sized plants. Unmbellets one, or two, sub- 
sessile and irom eight to ten peduncied, composed of erect, linear, 
short pedicelled, compound spikes, of simple, sessile, lanceolate, from 
six to tcu-iiowered spikelets which surround every part of the com- 
pouud spikes. —lavolucre three-leaved, with some smaller within 
these thr ree, margins and keel as in the leaves.— Inzolucels small, 
one-third the length of the umbellets. —Scales membrane-borderedy 
acute. —Filaments three, membranaceous. Anthers ending ina 
thread. — Seeds three-sided. 
36. e. umbellatus. Vahl. Enum. PL 2. 362. 
Culms ‘rom four to. Sis feet, blun: angled. Umbel deserit 6 
spikes all sate sessile, linear, spreading ; spikelets numerous, alternate, 
from three to four-Aowered, | Seed elliptic, three-sided. 
" Teling. Pedda shaka. 
_ A large species, growing in standing fresh water. 
“Root kbr ;us.— Culms erect, from four to six feet high, pretty 
smooth, naked, except at the base, obsoletely three-sided, angles 
rounded, sides hollowed.— Leaves mostly radical, sheathing, the long- 
est of them about as long as the culm.— Umbel decompound, - : 
. ing, about six inches each way. Umbellets, two or three sub- 
and from five to ten on pretty long peduncles of unequal lengths ; dey 
are composed of small partial, short-pedicelled umbellets of three 
to six linear compound spikes, composed of numerous, small, sessile, 
from three to four-flowered, simple spikelets. Involucel from three 
e 
