SYNGENESIA-POLYG.-SUPERF. Pyrethrum. 451 



oblong, angular, abrupt, furrowed, crowned with an ele- 

 vated membranous border. Recept. naked, convex. 

 Herbaceous, very rarely shrubby ; either perennial or an- 

 nual. Leaves either simple and oblong, or repeatedly 

 compound, or variously cut. Fl. terminal, with a yellow 

 disk and white rays ; generally smaller than in the last 

 genus, from which the [present is distinguished by the 

 crown of the seed, and by the narrower, more simple, 

 border of the more oblong and equal calijx-scales. Fla- 

 vour bitter, often unpleasantly aromatic. Haller seems, 

 by his own account, to have chosen the above generic 

 name in allusion to the acrid roots of his n. 96. P. alpi- 

 num of Willdenow, which agree with the plant of the an- 

 tients to which he refers. 



1. P. Partheniwn. Common Feverfew. 



Leaves stalked, compound, flat; leaflets ovate, cut; the up- 

 permost confluent. Flower-stalks corymbose. Stem 

 erect. Rays shorter than the diameter of the disk. 



P. Parthenium. Fl. Br. 900. Engl. Bot. v. J 8. 1. 123 1 . Willd. Sp. 

 PI.v.3.2\5d. Relh.334. Hook. Scot. 246. 



Matricaria Parthenium. Linn.Sp.Pl.VZbD. Huds.37\. With. 735. 

 Woodv.suppl.t. 249. FLDan.t.674. Bull. Fr.t. 203. Dalech. 

 Hist. 954. f. 



M n. 100. Hall. Hist. V. 1.42. 



Matricaria. Rail Sijn. 1 87. Ger. Em. 652./. Dod. Pempt. 35. f, 

 Trag. Hist. 156. f. Briuif. Herb. v. 1 .246./. 245. 



M. nostras. Lob. Ic. 75\.f. 



Parthenium sen Matricaria. Matth. Valgr. v. 2. 258./ Camer, 

 Epit. 649./. 



Artemisia tenuifoHa. Fuchs. Hist. 45,/ 



A. ramosae altera species. Fuchs. Ic. 26. f. 



?>verfevv. Petiv. H. Brit. t. 19./ 5. 



In waste ground, and about hedges, frequent. 



Biennial. June, Juhj. 



Root tapering. Stem erect, branched, leafy, round, furrowed, 

 many-flowered, about 2 feet high, or more. Lcorcs stalked, of 

 a hoary green, once or twice i)innate, or pinnatifid ; the leaflets, 

 or segments, inclining to ovate, dccurrent, cut. Pmiicle corym- 

 bose, sometimes comj)ound ; ihcJ/owcrstaUis long, naked, sin- 

 gle-flowered, swelling u))war(ls. Fl. erect, about luilf an inch 

 broad, with a convex yellow disk, and numerous short, broad, 

 abrupt, two-ribbed, white rays j often wanting; sometimes mul- 

 tiplied, and, the disk being obliterated, constituting a double 

 flow(y. The stcds are certainly crowned with a short mem- 



