POLYGAMIA, SUPERFLUA. 
dentate ; flowers corymbose, erect; calices 5- 
flowered.— Willd. and Pursh. 
C. glauca, Muhl. 
Icon. Pluk. alm. t. 101. f. 1. 
Orach-leaved Cacalia. 
From two to five feet high. Lower leaves very large; all the 
leaves as well as the stem, bluish or glaucous beneath. Flow- 
ers white, inodorous. On the high banks of the Wissahickon, 
and in the woods above the falls of Schuylkill, west side; rare. 
Perennial. August. 
ee 
ORDER I. POLYGAMIA SUPERFLUA. 
Florets of the disk bi-sexual, of the ray feminine ; 
( all fertile.) 
§ 1. Florets discoid ; those of the ray obsolete. 
311, TANACETUM. Gen. pl. 1280. ( Corymbifere.) 
Calix imbricated, hemispherical, scales acu- 
minated. Rays of the corolla obsolete, 
trifid. Receptacle naked. Pappus sub- 
marginate.—Vutt. 
1. I’. leaves bipinnate, incised, serrate.—Willd. 
{con. Oed. Dan. 871. 
Tansey. 
Common tansey is often met with on the edges of fields, and 
on road-sides, with the appearance of growing wild. In these 
places it is completely naturalized. Well-known in domestic 
medicine asa tisan. Leaves deep green. Flowers bright yel- 
low. Perennial. July. 
314. GNAPHALIUM. Gen. pl. 1282. (Corymbifere.) 
Calix imbricated, marginal scales rounded, 
scariose, shining and coloured. Radii none: 
feminine florets marginal, entire, mostly nu- 

105 
vulgare. 

