POLYGAMIA, SUPERFLUA, 
103 
dentate ; flowers corymbose, erect 5 calices 5- 
fiowered. — JVUld. and Purslu 
O. glanca, Muhl. 
Icon. Pink. aim. 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. 
ORDER II. POLYGAMIA SUPERFLUA. 
(Florets of the disk hi-sexual^ of the ray femmine; 
all fertile.') 
^ § 1 . Florets discoid ; those of the ray obsolete. 
311. TANACETUM. Gen. pi. 1280. {Corymbifera.) 
Calisc imbricated, hemispberical, scales acu- 
minated. Rays of the corolla obsolete, 
triftd. Receptacle naked. Pappus siib- 
marginate. — 
1 . T. leaves bipinnate, incised, serrate. — TVilld. 
Icon. 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 as a tisan. Leaves deep green. Flowers bright yel- 
low. Perennial. July. 
314. GNAPHALIUM. Gen.pl. 1282. (Corymbifer<e,) 
Calix imbricated, marginal scales rounded, 
scariose, shining and coloured. Radii none ; 
feminine florets marginal, entire, mostly nu- 
vulgare. 
