SYNGENESIA. SIJPERFUJA, 141 



551. SANTOLINA. 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. S. snnveolens. Ph. Hab. 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 Jinthemis than 

 to Santolina, notwithstanding the absence of radii, which 

 do^not always constitute a generic distinction? 



A genus of about 12 species, almost exclusively indigo- 

 nous to the South of Europe. 



Order II.— POLYGAMIA SUPERFLUA. 



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

 nine; all fertile.) 



f Florets discoid; those of the ray obsolete. 



552. TANACETUM. L. (Tansey.) 



Calix imbricated, hemispherical, scales acu- 

 minated. Rays of the corolla obsolete, trilid. 

 Receptacle naked. Pappus submarginatc. 



Herbaceous, rarely suffruticose, leaves simple, or pseu- 

 Jopinnate; flowers corymbose, yellow. 



Species. 1. T. vidgare. Naturalized. 2. * hw'-onense. 

 Leaves pseudobipinnate, inciseJy serrate, under side part- 

 ly tomentose; pedicells enlarged; flowers larger; radd ir- 

 regular, 4 and 5-cleft. Hab. With Artemsia caimdetisis 

 on the sandy shores of Lake Huron, near Michilimakinak; 

 abundant. Obs. Perennial. Nearly allied to T. vulgare, 

 and about the same magnitude. Flowers corymbose, 

 citron-yellow, and much larger than in the common spe- 

 cies; rays entire, and also 4 and 5-cleft. 



