924 FLORA. 



20. Eupatorium aromaticum L. SMALLER WHITE SNAKE-ROOT. (I. F. f. 

 3630.) Puberulent or glabrate, slender, branched at the summit, 3-7 dm. high. 

 Leaves opposite, petioled, firm, obtuse or acutish at the apex, rounded, cordate or 

 sometimes narrowed at the base, crenate-dentate, 4-7 cm. long, 18-35 mm - wide, 

 3-nerved and veiny; petioles 4-16 mm. long; inflorescence usually compact; heads 

 1 0-25 -flowered; involucre campanulate, 3-4 mm. high, its bracts linear, generally 

 obtuse; flowers white. In dry soil, Mass, to Fla. Aug.-Oct. 



21. Eupatorium coelestinum L. MIST-FLOWER. (I. F. f. 3631). Pubes- 

 cent or puberulent. branched. 3-9 dm. high. Leaves opposite, petioled, ovate, 

 obtuse or acute at the apex, truncate at the base, or abruptly contracted into 

 the petiole, crenate-dentate, 4-7 cm. long. 18-35 mm - wide; heads 4-6 mm. high; 

 involucre broadly campanulate, its bracts linear-lanceolate, acuminate; flowers 

 blue or violet. In moist soil, N. J. to Fla., III., Kans., Ark. and Tex. Also in 

 Cuba. Aug.-Oct. 



5. WILLUGBAEYA Neck. 



Herbaceous twining vines, or some tropical species shrubs, with opposite, peti- 

 oled leaves, and discoid, mostly cymose-paniculate heads of white or pink flowers. 

 Heads 4-flowered. Involucre oblong, of 4 slightly unequal narrow bracts. Recep- 

 tacle small, naked. Corolla 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 roughish bristles in I 

 or 2 series. [Probably named in honor of Francis Willoughby, 1635-1672, Eng- 

 lish naturalist, but the name spelled by Necker as above.] About 150 species, of 

 Am. Besides the following another occurs in the southern U. S. 



i. Willugbaeya scandens (L.) Kuntze. CLIMBING HEMPWEED OR BONESET. 

 (I. F. f. 3632.) Glabrous or nearly so, 1.5-4.5 m. long. Leaves ovate or has- 

 tate, deeply cordate, acuminate, repand or obtusely dentate, 5-10 cm. long, 2-5 cm. 

 wide; petioles slender, shorter than the blades; heads in compound clusters borne 

 at the ends of the branches; involucre about 6 cm. long, its bracts lanceolate, 

 acuminate or apiculate; flowers white or pink; achenes resinous. In swamps and 

 moist soil, N. H. and Mass, to western Out. and Ind.. Fla. and Tex. Also in the 

 W. Ind. and S. Am. July-Sept. 



6. COLEOSANTHUS Cass. 



Herbs or shrubs, with 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 naked. Corolla regular, 5-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.] About 60 species. 

 Besides the following some 40 others occur in the southern and western U. S. 



i. Coleosanthus grandiflorus (Hook.) Kuntze. LARGE-FLOWERED THOR- 

 OUGHWORT. (I. F. f. 3633.) Erect, glabrous or puberulent, much branched, 

 6-9 dm. high. Leaves slender-petioled, deltoid-ovate, cordate at the base, acumi- 

 nate at the apex, coarsely crenate-dentate, 5-10 cm. long, 2-5 cm. wide; heads 

 short-peduncled, 12-14 mm - l n g; peduncles pubescent; involucre campanulate, 

 30-45 -flowered, the outer bracts ovate, pubescent, usually abruptly acuminate or 

 subulate-tipped, the inner linear, glabrous, striate. Mont, to Mo., Kans., N. Mex. 

 to Ore. and Ariz. Aug. -Sept. 



7. KUHNIA L. 



Perennial herbs, with alternate punctate resinous-dotted leaves, and discoid 

 heads of white or purplish flowers in terminal cymose corymbs. Involucre turbi- 

 nate-campanulate, its bracts striate, imbricated in several series, the outer shorter. 

 Corolla regular, the tube slender, the limb 5-lobed. Anthers obtuse and entire at 

 the base, nearly or quite separate. Style-branches slender, obtusish. Achenes 

 lo-striate. Pappus a single row of numerous very plumose bristles. [Named for 

 Dr. Adam Kuhn, of Philadelphia, a pupil of Linnaeus.] About 8 species, of 

 N. Ara. and Mex. 



