STNGENESIA, SUPERFLUA. 141 



551. SANTOLINA. L. (Litvender Cotton.) 



Calix imbricated lieaiispherical, scales cari- 

 nate, vvjtIi scariose points. Receptacle palea- 

 ceous. Pappus none. 



Suffruticose or herbaceous; leaves mostly mumte, in 

 some si^ecies imbricated, in a few others pseudobipinnate 

 or mutifidly dissected; flowers often soUtary and teimi- 

 nal, pedunculate or ramuline. Scarcely a natural genus? 



Species. I. S. sunvsolens. Ph. Hab. In Northern Cali- 

 fornia. — M. Lewis. Tiiis plant, introduced by the late 

 Governor Lewis, became a weed in the garden of Mr. 

 M'Manon, where Mr. Pursh, no doubt, saw it in a living 

 state. Is it not much more nearly allied to Antheviis than 

 , to Sa7itolina, notwitlistiinding the absence of radu, which 

 do,not always constitute a g"eneric distinction? 



A genus of about 12 species, almost exclusively indige- 

 nous to the South of Europe. 



Order IL—POLYGAMIA SUPERFLUA. 



(Florets of the disk bisexual, of the ray femi- 

 nine; all fertile.) 



t Florets discoid; those of the ray obsolete. 



552. TANACETUM. Z. ( Tansey.) 



CdUx imbricated, hemispherical, scales acu- 

 minated. Rays of the corolla obsolete, trilid. 

 Receptacle naked. Fappus submarginate. 



Herbaceous, rarely suffruticose, leaves simple, or pseu- 

 dopinnate; flowers corymbose, yellow. 



Species. 1. T. imlgare. Naturalized. 2. * hiironense. 

 Leaves pseudobipinnate, incisely serrate, under side part- 

 ly tomentose; pedicel [s enlarged; flowers larger; radii ir- 

 regular, 4and5-cleft. Hab \V]\.h ^irtemisia canadensis 

 on the sandy shores of Lake Huron, near Michilimakinak; 

 abundant. Obs. Perennial. Nearly allied to 7' vidjare^ 

 and about the same magnitude. Flowers corymbose, 

 citron-yellov/, and much larger than in the common spe- 

 cies; rays entire, and also 4 and o-cleft. 



