PYRETHRUM BiVnaroLiow. 
Hairy New Holland Pyrethrum. 
SYNGENESIA POLYGAMIA SUPERFLUA.—Nar. Orv. COMPOSIT£. 
Gen. Cuar.—Receptaculum nudum. Achenia margine membranacea coro- 
‘Rata (rarissime breviter papposa). Involucrum hemisphericum, foliolis 
acutiusculis imbricatis, margine membranaceis.—Sm. 
oe diversifolium ; caule subramoso pilis articulatis hirsuto, fo- 
liis pinnatifidis i incisis petiolo dilatato, superioribus subintegris, ache- 
niis margine brevi papposo. 
Pyrethrum diversifolium, Granam, MSS. 
Root annual. Stem about a foot high, clothed, except at the extremity, with 
scattered, white, beautifully jointed hairs, rarely tipped with a small 
gland; scarcely branched. Leaves 2-3 inches long, pinnatifid, the seg- 
ments lanceolate, entire or incised, glabrous, the petioles about as long 
as the leaf, in the lower leaves scarcely dilated, the rest remarkably so, 
upper ones | nearly entire, all of them — especially at the margin, _ 
Flowers terminal, solitary. Calyx shortly hemispherical, imbricated with | 
greenish, oblong, scarcely concave scales, white, membranous at the _ 
margin, fringed at the extremity with minute glandular hairs. Disk — 
yellow. Ray white. Receptacle naked, at length, very convex, dotted. 
crowned with 
Germens and young Achenia obovato-oblong, oblique, ee. 
short, simple, marginal pappus of hairs. 
This has altogether the habit of a Chrysanthemum or a, 
rethrum, approaching nearer to the character of the latter in — = 
having a crown to the achenia or seeds; but then this crown . 
is a short hairy pappus, which may perhaps be considered. of : 5 : : 
sufficient importance to cause it to be removed, although = - ee 
a removal would a asad poss be oes to very dra 
