LXXV. COMPOSITE. 
Enhydra.] 
183 
Ray-florets female, ligule minute, 3- to 4-toothed. Disc-florets 
tubular, 5-fid. Involucral bracts 4, fohaceous in opposite pairs. 
Achenes oblong; no pappus. Species 6, tropics. 
(1) E. fluctuans Loureiro FI. Cochinchine 511; Hook. fil. F.B.I. 
iii. 304. 
Glabrous, 1 to 2 ft. long, rooting at nodes. Leaves 1 to 3 in. 
long, narrow. Heads sessile axillary, *3 to '6 in. across. Hab. 
In wet muddy spots, Singapore, Galang (Ridley). Penang, Dato 
Kramat (Curtis). Distrib. Indo-Malaya. Native name: Chinkro. 
Use: The Chinese use it as a drug, the Malays as a vegetable. 
10 . BIDENS, Linn. 
Herbs. Leaves opposite, lobed, pinnatifid (or entire). Heads 
small or large, corymbose or sub-solitary. Ray-florets in 1 series, 
ligulate white (or yellow) neuter. Disc-flowers yellow bisexual; 
limb 5-fid, involucre campanulate. Bracts in two rows, outer 
herbaceous. Achenes linear or cuneate with a pappus of 2 to 4 
long retrorsely-bearded spines. Species 120, whole world. 
(1) B. pilosa Linn. Sp. PI. 832; King, l.c. 45. 
Erect branched glabrous (or hairy) herb about 2 ft. tall. Leaves 
trifid or tripartite (2- to 3-pinnatifid), about 3 in. long; segments 
ovate to lanceolate serrate. Heads *3 to *4 in. across; peduncles 
•5 to 3 in. long. Ray flowers white (but often absent). Bracts 
