COMPOSITAE (COMPOSITE FAMILY) 785 



and helpful correspondent of Muhlenberg, Fraser, and others.) COLEOSANTHTJS 

 Cass. 



1 B. grandiflbra (Hook.) Nutt. Nearly glabrous, 6-9 dm. high; leaves 

 deltoid, cordate, the upper deltoid-lanceolate, coarsely dentate-serrate, acumi- 

 n:itr, 1 dm. long or less; heads about 40-flowered. (Coleoaanthus Ktze.) 

 Mo. and Kan., westw. and southwestw. 



8. KtHNIA L. 



Heads discoid, 10-25-flowered ; flowers perfect. Involucral bracts thin, few, 

 and loosely imbricated, narrow, striate-nerved. Corolla slender, 5-toothed. 

 Achenes cylindrical, 10-striate ; pappus a single rov/ of very plumose bristles. 

 A perennial herb, resinous-dotted, with mostly alternate leaves, and paniculate- 

 corymbose heads of cream-colored flowers. (Dedicated to Dr. Adam Kuhn of 

 Philadelphia, who carried the living plant to Linnaeus.) 



1. K. eupatorioides L. Stems 3-9 dm. high; pubescence minute; leaves 

 varying from broadly lanceolate and toothed to linear and entire. Dry soil, 

 N. J. to Minn., S. Dak., and southw. Sept. Very variable. Var. CORYM- 

 BULOSA T. & G. Stouter and somewhat more pubescent, the heads rather 

 crowded. (K. glutinosa Ell.) 111., westw. and southw. 



9. LlATRIS Schreb. BDTTON SNAKEROOT. BLAZING STAR 



Heads discoid, few-many-flowered ; flowers perfect. Involucral bracts 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 plumose or barbellate bristles. Perennial herbs, often resinous-dotted, 

 with simple stems from a roundish conn or tuber, rigid alternate narrow entire 

 leaves (sometimes twisted so as to become vertical), and spicate or racemed 

 handsome rose-purple flowers, late in summer or in autumn. (Derivation of 

 name unknown.) LACINARIA Hill. LACINIARIA Hill. 



* Pappus very plumose ; bracts of the 5-flowered involucre with ovate or lanceo- 

 late spreading petal-like (rose or sometimes white) tips, exceeding the flowers. 



1. L. elegans (Walt.) Willd. Stem (0.6-1 m. high) and involucre hairy; 

 leaves linear, short and spreading ; spike or raceme compact, 1-5 dm. long. 

 (Laciniaria Ktze.) Barren soil, Va., and southw. 



* * Pappus very plumose ; bracts of the cylindrical many-flowered involucre 



imbricated in many rows, the tips rigid, not petal-like ; corolla-lobes hairy 

 within. 



2. L. squarrbsa Willd. (BLAZING STAR, etc.) Often hairy, 1.5-6 dm. 

 high; leaves rigid, linear, elongated; heads usually few, 1.5-3.5 cm. long; 

 bracts mostly with elongated and leaf-like spreading tips. (Laciniaria Hill.) 

 Dry soil, Pa. to Minn., and southw. Var. INTERMEDIA (Lindl.) DC. Heads 

 narrow ; bracts shorter, erect or nearly so. (Lacinaria squarrosa, var. Porter.) 



Ont. to Neb. and Tex. 



3. L. cylindracea Michx. Commonly smooth, 1.5-5 dm. high ; leaves linear ; 

 heads few, 1.5-2.5 cm. long; bracts with short and rounded abruptly mucronate 

 appressed tips. (Laciniaria Ktze.) Dry open places, Ont. to Minn, and Mo. 



Heads sometimes reduced to a solitary slightly enlarged terminal one (var. 

 SOLIT\RIA MacM.). 



*** Pappus very plumose ; heads i-6-flowered ; bracts acuminate ; corolla-lobes 



naked. 



4. L. punctata Hook. Stout, 1.5-8 dm. high, from a branching or globose 

 rootstock ; leaves narrowly linear or the upper acerose, rigid ; heads usually 

 many in a dense spike. (Laciniaria Ktze.) "O."; Minn., westw. and 

 southw. 



GRAY'S MANUAL 50 



