GENUS 5. 



THISTLE FAMILY. 



regular, its tube slender, the limb campanulate, 5-cleft. Anthers entire and obtuse at the 

 base. Style-branches elongated, acutish. Achenes truncate, 5-angled. Pappus of numerous 

 capillary bristles. [In honor of Joseph Gottfried Mikan, 1743-1814, professor at Prague.] 



About 150 species, natives of America. 

 Besides the following, two others occur in 

 the southern United States. Type species : 

 Mikania hastata (L.) Willd. 



i. Mikania scandens (L.) Willd. 



Climbing Hempweed or Boneset. 



Fig- 4I73- 



Eupatorium scandens L. Sp. PI. 836. 1753. 

 M. scandens Willd. Sp. PI. 3: 1743. 1804. 

 Willoughbya scandens Kuntze, Rev. Gen. 

 PI. 371. 1891. 



Glabrous or nearly so, twining over 

 bushes, 5-i5 long. Leaves ovate or 

 hastate, deeply cordate at the base with 

 the lobes rounded or truncate, acumi- 

 nate at the apex, repand or obtusely 

 dentate, 2-4' long, i'-2' wide; petioles 

 slender, shorter than the blades ; heads 

 in compound clusters borne at the ends 

 of the branches; involucre about 3" 

 long, its bracts acuminate or apiculate ; 

 flowers white or pink; achenes resinous. 



In swamps and moist soil, Maine to west- 

 ern Ontario, Florida and Texas. West 

 Indies and South America. July-Sept. 



6. COLEOSANTHUS Cass. Diet. 10 : 36. 1817. 



[BRICKELLIA Ell. Bot. S. C. & Ga. 2 : 290. 1824.] 



Herbs or shrubs, with opposite or alternate leaves, and discoid heads of white yellowish 

 or pink flowers, in panicles or cymes, or rarely solitary. Involucre campanulate or oblong, 

 its bracts striate, imbricated in several series, the exterior ones successively smaller. Recep- 

 tacle flat or convex, naked. Corolla regular. S-lobed. Anthers obtuse at the base. Style- 

 branches long, obtuse. Achenes lo-striate or lo-ribbed. Pappus a single row of numerous 

 rough or serrate bristles. [Greek, sheath-flower.] 



A genus of about 70 species. Besides the following, some 45 others occur in the southern and 

 western United States. Type species : Coleosanthus Cavanillcsii Cass. 



i. Coleosanthus grandiflorus (Hook.) Kuntze. 



Large-flowered Thorough wort. 

 Fig. 4174. 



Eupatorium grandiflorum Hook. Fl. Bor. 



Am. 2 : 26. 1834. 

 Brickellia grandiflora Nutt. Trans. Am. 



Phil. Soc. (II.) 7: 287. 1841. 

 Coleosanthus grandiflorus Kuntze, Rev. 



Gen. PI. 328. 1891. 

 C. umbellatus Greene, Pittonia 4 : 238. 



1901. 



Erect, glabrous or puberulent, much 

 branched, 2-3 high. Leaves slender- 

 petioled, deltoid-ovate, cordate at the 

 base, acuminate at the apex, coarsely 

 crenate-dentate, 2'-4' long, i'-2' wide; 

 petioles shorter than the leaves ; in- 

 florescence cymose-paniculate ; heads 

 short-peduncled, 6"-7" long ; pedun- 

 cles pubescent ; involucre campanu- 

 late, 3O-45-flowered, the outer bracts 

 ovate, pubescent, usually abruptly 

 acuminate or subulate-tipped, the in- 

 ner linear, glabrous, striate, obtuse 

 or acute; pappus bristles scabrous. 



Montana to Wyoming, Missouri, New 

 Mexico, Washington and Arizona. Aug.- 

 Sept. Tassel-flower. 



