GENUS 5. THISTLE FAMILY. 363 
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. ww 
Besides the following, two others occur in \ 
the southern United States. Type species: 
Mikania hastata (L.) Willd. 
1. Mikania scandens (L.) Willd. 
Climbing Hempweed or Boneset. 
Fig. 4173. 
Eupatorium scandens L. Sp. Pl. 836. 1753. 
M. scandens Willd. Sp. Pl. 3: 1743. 1804. 
Willoughbya scandens Kuntze, Rev. Gen. 
Pl. 371. 1891. 
Glabrous or nearly so, twining over 
bushes, 5°-15° 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, 1’-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. 
nN 
Bo eththaig Ne y 
We AAS 
tL 
4 AV 
6. COLEOSANTHUS Cass. Dict. 10: 36. 1817. 
[BrickeLiia 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. 5-lobed. Anthers obtuse at the base. Style- 
branches long, obtuse. Achenes Io-striate or 10-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 Cavanillésii Cass. 
1. Coleosanthus grandiflérus (Hook.) Kuntze. Large-flowered Thoroughwort. 
Fig. 4174. 
Eupatorium grandiflorum Hook. FI. Bor. 
Am, 2: 26. 1834. 
Brickellia grandiflora Nutt. Trans. Am. 
Phil. Soc. (IL) 7: 287. 184%. 
Coleosanthus grandiflorus Kuntze, Rev. 
Gen. Pl. 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, 1-2’ wide; 
petioles shorter than the leaves; in- 
florescence cymose-paniculate; heads 
short-peduncled, 6-7” long; pedun- 
cles pubescent; involucre campanu- 
late, 30-45-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. 
