454 8 YNGENESI A [ AsTBRoii> Ea , 



ance it seems sufficiently distinct from the preceding; but it must be confessed, 

 that there are intermediate specimens by which the two are connected, or blended 

 •o as to render it extremely difficult to make a satisfactory discrimination. p ro f* 

 Hooker is of opinion that* both they, and the Synonyms here cited with them, may 

 be safely referred to E. purpureum. Some twenty or more additional species are 

 enumerated in the U. States,— and there are a few others known, in the South and 

 West, which appear not to be described. A good monograph of the genus is much 

 wanted,— and would be an acceptable treat to American Botanists. 



372. MIKANIA. Wilhl. Mitt. Gen. 643. 

 [Dedicated to Joseph Mikan ; a Botanist of Prague.] 



Heads mostly 4-flowered. Involucre in a single scries; leaflets 4 or 

 5, nearly equal. Corolla with the limb campanulatc. Pappus in a 

 single series, not plumose. Receptacle naked. 



1, M. scandens, JVilld. Stem volubile, climbing, smooth ; leaves 

 subhastate-cordate, acuminate, rcpand-dentatc. Beck, Hot. p. 198. 

 Eupatorium scandens. Mx. Am. 2. p. 97. 



Climbing Mikania. 



Root perennial. Stem 3 to 5 or 6 feet long, slender, striate, smooth ish, twining. 

 Leaves an inch and half to 3 or 4 inches Ion?, and 1 to 2 or 2 and a half inches 

 wide, somewhat hastate-cordate, with a conspicuous slender acuminatum, irretm- 

 larly repand or angular-dentate, thin, slightly pubescent and scabrous; petioles 

 8 fourths of an inch to 2 or 2 and a half inches long, flat, nerved, opposite. Head* 

 of flowers in clustered cymose corymbs, on axillary branches 3 to 6 inches in 

 length,— the branches with a pair of leaves near the corymbs ; pedicels sjwiringly 

 bracteate ; involucres 4 or 5-flowered, the leaflets lance-linear, rather acute, some- 

 what scabrous-pubescent, scarious on the margin. Florets whitish, tinned with 

 pale bluish-purple. 

 Hab. Swampy thickets, and along rivulets: not common. Ft. Aug. />. Sept. 



Obs. This has been found in various parts of the County ; but is by no means 

 common. The leaves have a considerable resemblance to those of the common 

 Duckttluat. There is another species in the U. States, — scarcely differing from 

 this, except in pubescence: and, indeed, the genus itself,— as Elliott, Lessuig, &c. 

 hare remarked,— is hardly distinct from Eupatorium. 



VI. Aster Tribe, Heads mostly heterogamous, with pistillate or 

 neutral florets, in one or many series, in the circumference ; rarely 

 dioicous. Corolla of the perfect florets mostly regular, b-toolhed. 

 8tyle, in the perfect florets, bifid, the branches linear, flattish, mostly 

 with a straight acumination. Asteroidkjs. Lessing. 



Sub-Tribe 1. Astbrbjs. Heads never dioicous, mostly heterogamous, with pis. 

 tillate florets in the circumference, in I or several series, bearing ligulatc corollas, 

 and with perfect florets in the disk. Receptacle mostly without bracts. 



373. SOLIDAGO. L. Jfutt. Gen. 660. 

 [Latin, solido, to make firm, or to heal ; from its supposed virtues.} 



Heads small, few-flowered. Involucre imbricated, with the leaflets 

 appressed. Florets of the ray few (about 5), in a single series, pis- 

 tillate, — of the disk perfect Pappus in a single scries, pilose. JU> 



