490 8TNGENESIA [Se^«iokii,r* 



inches wide, subsessile, more or less pilose, bipinnatcly and finely dissected, ih« 

 segments very numerous, linear, mucronate, incised. Heads of flower? small 

 numerous, in a dense terminal compound fastigiate corymb ; involucre subovoid 

 pilose, the leaflets lance-oblong, unequal, imbricated, with a prominent keel or 

 midrib; rays about 5, white, or often tinged with purple, roundish-olovatc, cren- 

 ato-dentate at apex ; disk-florets few, the tube sprinkled with rest not* particles- 

 Akenes compressed, slightly margined near the summit, bald, smooth. Recej4ad t 

 flat, chaffy, the chaff lance-oblong. 



Ilab. Pastures, fence-rows, &c common. Fl. June— Sept. Fr. August— Octo. 



Obs. An aromatic hitter and astringent ; and popular as a tonic. This foreigner 

 is now extensively naturalized. The Europeans seem to consider it as a plant of 

 tome value in their pastures : But it is here universally, I believe, regarded as a 

 mero weed. 



§ 2. Chrysaxtiikmejs— the receptacle without bracts. 



391. CHRYSANTHEMUM. L. JSTutt. Gen. 671. 

 [Greek, Chrysos, gold, and Anthemoti, a flower; from the yellow disk.] 



Involucre campanulatc, the leaflets imbricated, the inner ones with 

 dilated scarious margins. Rays numerous, long, ligulate, pistillate; 

 tube of the disk-florets fleshy, compressed, and somewhat margined. 

 Akcne* subterete, bald, with a large epigynous disk. Receptacle rather 

 large, convex, naked. 



1. C. leucanthemum, i. Stem erect, subramose ; leaves oblong, 

 crenately incised, subamplexicaul, the lower ones cuncate-spatulate, 

 pctiolate, Ucch, But. p. $12;— r^r* 



White-floweiikd CHnTSANTHEMrrM. Tulgo — Daisy. Ox-eye Daisy. 



Gall. L'ceil dc Bocuf. Ger. Die WucherWumc. ffiefj. Margarita mayor. 



Root perennial. Stem 1 to near 2 feet high, erect, or subdecumbent at base, 

 angular and striate, somewhat pilose, purplish on the angles, simple, cr sparingly 

 branched. Leaves 3 fourths of an inch to an inch and half long, and 1 fourth to 2 

 thirds of an inch wide, alternate, smooth, caulinc ones oblong, mostly obtuse, 

 incised, often plnnatifid near the base, sessile and subamplexicaul, the lower ones 

 cuneatespatulate, attenuate at base, radical ones orbicular-spatulalc, crenately 

 incised, and dentate, petiolate. Heads of flowers large (1 to 2 inches in diam- 

 eter, including the rays), solitary, terminal ; involucre smooth, dilated-campan- 

 ulate, or depressed-hemispherical, the leaflets imbricated, lanceolate, the apex 

 of the inner ones with a dilated scarious margin; rays white, elliptic-oblong, 

 narrowed at base, spreading, in length about equal to the diameter of the disk; 

 disk yellow, slightly convex. Akenes subterete, ribbed, bald, smooth, dark purple, 

 or nearly black. Receptacle slightly convex, naked, dotted. 



Jfab. Fields, and meadows: frequent. PI. June— August. Fr. July —Sept. 



Obs. This vile foreign weed, from the culpable negligence of the farmers, hai 

 become a serious nuisance in many neighborhoods ; and threatens to overrun the 

 whole country. In Europe, the C. segetum seems to be considered a greater evil ; 

 but that has not yet been introduced here. There are no native species knows 

 in the U. States, —though Pursh mentions one on ths N. W. coast,— and Prof. 

 tft>oker enumerates 2 or 3 in British America. 



