pond plant; root-stock short, stout, almost tuberous, emit- — 
ting stout fibres. Stems two to four feet high, very graceful, 
simple below, sparingly dichotomously branched above, the | 
branches terminating: in single heads. eaves very few; 
radical erect, very slender, rush-like, with short bases that 
sheath the very base of the stem, quite terete and smooth, 
purplish green; cauline leaves few, small, short, subulate. 
Heads two and a half inches in diameter, with a very small 
disk, and about 8 large purple rose-coloured or crimson rays. 
Involucre short, one-third of an inch in diameter ; outer bracts, 
broadly oblong, obtuse, recurved ; inner erect, linear-oblong, 
toothed towards the summit, receptacle naked, papilose. Ray- 
_ Mowers with a small naked achene, a very short slender tube, 
anda broad obovate-spathulate limb an inch long and nearly 
half as broad, entire or lobulate at the tip, 5-nerved. Disk 
Jlowers yellow ; corolla-tube long, with short papillar recurved _ 
teeth; anther-cells shortly ciliate at the base. Stigmatic 
arms spreading, truncate. Achenes nearly quadrate, with a 
narrow ciliate wing, and two short hispid arms.—/. D. H. 
Figs. 1 and 2, inner involucral bracts ; 3, section of involucre and receptacles ; 
4, ray flower; 5, stylearms; 6, disk ower; 7,achene; 8, anther ;—all enlarged. 
