16. E. cœlestìnum, L. (MIST-FLOWER.) Somewhat pubescent (1--2° high), leaves opposite, petiolate, triangular-ovate and slightly heart-shaped, coarsely and bluntly toothed; heads many-flowered, in compact cymes; flowers blue or violet. (Conoclinium cœlestinum, _DC._)--Rich soil, N. J. to Mich., Ill., and southward. Sept. 6. KÙHNIA, L. Heads discoid, 10--25-flowered; flowers perfect. Involucral scales thin, few and loosely imbricated, narrow, striate-nerved. Corolla slender, 5-toothed. Achenes cylindrical, 10-striate; pappus a single row of very plumose (white) bristles.--A perennial herb, resinous-dotted, with mostly alternate leaves, and paniculate-corymbose heads of cream-colored flowers. (Dedicated to _Dr. Kuhn_, of Pennsylvania, who carried the living plant to Linnæus.) 1. K. eupatorioìdes, L. Stems 2--3° high; pubescence minute; leaves varying from broadly lanceolate and toothed, to linear and entire.--Dry soil, N. J. to Minn., E. Kan., and southward. Sept. Very variable.--Var. CORYMBULÒSA, Torr. & Gray, is a western form, stouter and somewhat more pubescent, the heads rather crowded. 7. BRICKÉLLIA, Ell. Characters as in Kuhnia; involucral scales more numerous, and the bristles of the pappus merely scabrous or at the most barbellate or subplumose; leaves often all opposite. (_Dr. John Brickell_ of Georgia, correspondent of Elliott and Muhlenberg.) 1. B. grandiflòra, Nutt. Nearly glabrous, 2--3° high; leaves deltoid, cordate, the upper deltoid-lanceolate, coarsely dentate-serrate, acuminate, 4´ long or less; heads about 40-flowered.--Shannon Co., Mo. (_Bush_), Kan. to Col., New Mex., and westward. 8. LIÀTRIS, Schreb. BUTTON SNAKEROOT. BLAZING-STAR. Head discoid, few--many-flowered; flowers perfect. Involucral scales well imbricated, appressed. Receptacle naked. Corolla 5-lobed, the lobes long and slender. Achenes slender, tapering to the base, 10-ribbed. Pappus of 15--40 capillary bristles, manifestly plumose or only barbellate.--Perennial herbs, often resinous-dotted, with simple stems from a roundish corm or tuber, rigid alternate narrow entire leaves (sometimes twisted so as to become vertical), and spicate or racemed heads of handsome rose-purple flowers, appearing late in summer or in autumn. (Derivation of the name unknown.) [*] _Pappus very plumose; scales of the 5-flowered involucre with ovate or lanceolate spreading petal-like (purple or sometimes white) tips, exceeding the flowers._ 1. L. élegans, Willd. Stem (2--3° high) and involucre hairy; leaves linear, short and spreading; spike or raceme compact (3--20´ long).--Barren soil, Va. and southward. [*][*] _Pappus very plumose; scales of the cylindrical many-flowered involucre imbricated in many rows, the tips rigid, not petal-like; corolla-lobes hairy within._