166 ORDER JEQUALIS. 



some of their species are known by the imposing 

 name of Rattlesnake's-master. In the second sec- 

 tion, with corymbose flowers, the root-leaves are 

 rather broad, and nerved, or veined in 3 or 5 promi- 

 nent leading lines. The L. odoratissima of the 

 Carolinas is quite remarkable for its long persisting; 

 and powerful Vanilla odor, possessed by none of the 

 other species ; and this property is so obvious as to 

 have long obtained for the species the name of 

 ' Vanilla-plant.' The character of the genus is, to 

 have an oblong or hemispherical imbricated calyx ; 

 a naked receptacle ; the pappus (elegantly) plumose, 

 persistent, (and commonly colored somewhat purple). 

 The seed is also obconic, striated, and pubescent. 

 The most northern species is the L. scariosa, having 

 a large hemispherical calyx, composed of obovate, 

 nearly smooth scales, with scariose (or chaffy) mar- 

 gins, and the lower ones spreading ; the lower leaves 

 are lanceolate, but, as is the manner of the genus, 

 they diminish in size as they ascend the stem, until 

 they become little more than narrow oblong scales. 



Another very prevalent genus of the flosculous 

 flowered kind is Eupatorium, known in Europe by 

 the name of Hemp Agrimony ; with us by several 

 variable names, according to the species. They are 

 generally conspicuous for size, grow in rich, moist 

 grounds, and bear a profusion of small flowers, in 

 large, flat-topped clusters. The genus is described 

 as having an imbricate, oblong, loose calyx ; a long, 

 deeply-cleft, conspicuous style ; the receptacle naked ; 

 the pappus scabrous ; the seed angular, or with 5 

 striatures. In wet grounds, and near waters, in the 

 autumn, throughout the United States, you will fre- 

 quently meet with 4 tall species, or rather varieties, 

 of this genus, with the broad lanceolate, and serrated 

 leaver, verticillated, or growing by 3 to 5 at each 



