Class xviir. order i. sg 



Arctium. Calyx globose, with scales hooked 

 at apex : egret chaff-bristly : receptacle chaffy. 

 49. 54 — lafifia (burdock) stem-leaves cordate. % .p. 



SpARGANOPHORus. Calyx sub-globose, imbricate 

 with unequal scales recurve-spreading at the lips ; 

 receptacle naked: seed with a cup-like crown, sub- 

 cartilagenous. 49. 55 — verticiilatus (crown-cup) 

 leaves linear-setaceus whorled, about 1 -flowered. 



C. Florets iudulous ; Jloiuers discoid. 



BiDENS. Calyx calycled, nearly equal ; some- 

 times the flower is furnished with one or two radi- 

 ate florets : receptacle chaffy, flat: egret 2, 3 or 4 

 awns with reflexed and erect lateral prickles : seed 

 4-cornered. 49. 55 — With 1 or 2 radiate flor- 

 ets. — bifiinnata^ (burr-marigold or cuckold) leaves 

 doubly-pinnate. ©. — chrysanthemoides^ leaves ob- 

 long tapering to both ends, calyx shorter than ray. 

 0. y. — cernua^ leaves lanceolate, outer calyx long- 

 er than the florets. 0. y. — without radiate flo- 

 rets. — -frondosa^ outer calyx 6 times longer than 

 the florets, lower leaves pinnate, upper ones ser- 

 rate. 0. y. — connata^ stem-leaves in threes, floral 

 ones lance-oblong, (^. y. 



Kuhnia. Calyx imbricate, cylindrical : egret 

 plumose, sessile : receptacle naked. 49. 55 — eu^ia- 

 ioroides, (false boneset) leaves serrate, corymb 

 compact. 2/ . w.^^criionia, leaves entire, corymb 

 spreading. 2/. w. 



EuPATORiuM. Calyx imbricated (rarely simple) 

 oblong : style long, cloven half way down : egret pi- 

 lose or rough papillose : receptacle naked. 49. 55 

 —•FLORETS 6 OR MORE. — fierfoUatum^ (boneset, tho- 

 roughwort) leaves connate-perfoliate downy. % . w. 

 -r-purjiureum^i leaves petioled 4 or 5 in a whorl 

 lance-ovate, stem hollow. %, p. — verticillatumy 

 leaves 3 or 4 in » whorl with wedge-form base 



