SYNGENESIA, SUPERFLUA. 141 
551. SANTOLENA, L. (Lavender Cotton.) 
Calix imbricated hemispherical, scales cari- 
nate, with scariose points. Receptacle palea- 
ceous. Pappus none. 
Suffruticose or herbaceous; leaves mostly minute, in 
some species imbricated, in a few others pseudobipinnate 
or mutifidly dissected; flowers often solitary and termi- 
nal, pedunculate or ramuline. Scarcely a natural genus? 
Species. 1. 8. suaveolens. Pu. Has. In Northern Cali- 
fornia.—M. Lewis. This plant, introduced by the late 
Governor Lewis, became a weed in the garden of Mr, 
M/‘Mahon, where Mr. Pursh, no doubt, saw it in a living 
state. Is it not much more nearly allied to Anthemis than 
, to Santolina, notwithstanding the absence of radii, which 
do, not always constitute a generic distinction? 
A genus of about 12 species, almost exclusively indige- 
nous to the South of Europe. 
I 
Oxver IL—POLYGAMIA SUPERFLUA. 
(Florets of the disk bisexual, of the ray femi- 
nine; all fertile.) 
+ Florets discoid; those of the ray obsolete. 
552. TANACETUM. L. (Tansey.) 
Calix imbricated, hemispherical, scales acu- 
minated. Rays of the corolla obsolete, trifid. 
Receptacle naked. Pappus submarginate. 
Herbaceous, rarely suffruticose, leaves simple, or pseu- 
dopinnate; flowers corymbose, yellow. 
Spzcies. 1.1. vulgare. Naturalized. 2. * huronense. 
Leaves pseudobipinnate, incisely serrate, under side part- 
ly tomentose; pedicells enlarged; flowers langer; radii ir- 
regular, 4and S-cleft. Has. With canadensis 
on the sandy shores of Lake Huron, at leper cr are 
abundant. Ons. Perennial. Nearly allied to 7: vulgare, 
and about the same magnitude. Flowers corymbose, 
a citron-yellow, and much laegee tha in, the, sessment spe~- 
_ cies; rays entire, and also 4.and : 
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