o nrincinMl SYXGEXESIA 477 



Bab. Along Brandywinc J very rare. Fl. August. FY. September. 



nh* This was formerly collected along the west branch of the Brandywinc, 



k Mr John jACKSON,-and transferred 10 his Botanic Garden. It has not been 



• ,1,1 irowin* wild, in this County, for a number of years ; and I presume it is 



very scarce My specimens are from Mr. Jackson's garden. The recent 



Junt has a considerable odor, something between that of Yarrow and Tansey. 



2 P Uvedalt*, L. Leaves ovate, sinuate-lobed, roughish, the lower 

 ones 'broad, subpalmate, narrowed at base to a sinuate winged petiole; 

 rays elongated, tridentate. Beck, Bot. p. 208. 



Uveiial's Polymma. 



Roo> perennial. Stem 3 or 4 to 6 feet high, stouter than the preceding, angular 

 and sulcatcstriatc, smoothish below, branched above, the branches mostly oppo- 

 site and axillary, roughish-pubescent. Leaves 4 to 10 or 12 inches long, mostly 

 opposite, thin, roughish-pubescent and ciliate, -the lower ones large, nearly as 

 wide as long, patmately 3or5-lobed, abruptly contracted at base to a tapering 

 winged petiole which is somewhat sinuatc-lobcd, and 2 to 4 inches long,— the upper 

 ones smaller, subovatc, acute or acuminate, einuate-lobed, on shorter petioles. 

 Beafooi flowers something larger than in the preceding, in small loose panicles 

 terminating the branches ; peduncles glandular-pubescent ; outer leaflets of the 

 involucre large, obovate, somewhat glandular-pubescent and ciliate, foliaceous, 

 deep green, the inner ones smaller, lance-ovate, acuminate, thin and membranous, 

 pubescent; rays deep yellow, oblong, about an inch in length, 3-toothcd at apex ; 

 disk yellow. Akenes roundish-obovoid, smooth. 

 Hub. Great Valley, near Brooke's Mill: rare. FL August. Fr. Sept. 



Obs. This is also, rare, here,— having only been found, as yet, in the above 

 locality, -where it was detected by Mr. Joshua Hoopks, in 1628. There are no 

 other species known, in the U. States. 



VII. Sexecio Tribe. Heads mostly heterogamous, -with pistillate 

 or neutral florets, in 1 or many series, in the circumference, — some* 

 times monoicous, rarely dioicous. Style, in the perfect florets, bifid, 

 —the branches longish, linear, mostly broader towards the apex, 

 either truncate and penicillate only at apex, or terminating in a 

 short pubescent cone, or narrow linear appendage. Senecionide^. 

 Leering. 



Sub-Tribe 1. Ambrosie^s. Heads monoicous, or heterogamous with staminate 

 florets in the centre. Anthers ecaudate. Receptacle, in heterogamous heads, 

 bracieate, the bracts glabrous. Corolla of the pistillate Jlorets filiform: akenes 

 buld, not beaked, often included in the involucre. 



381. XANTHIUM. L. Mitt. Gen. 704. 

 [Greek, Xanthos, yellow ; a color said to be produced by the plant.] 



Heads homogamous, monoicous, — the pistillate ones 2-flowered, invest- 

 ed by an uncinately-spinose involucre. Jlkenes compressed, one in 

 each cell of the bilocular, and finally indurated, involucre. 



L X. strumariuh, L. Stem unarmed ; leaves ovate, angulate-den- 

 tate, subcordate and strongly 3-nerved % at base. Beck, Bot. p. 210. 



