194 45. COMPOSITE. 



Order XLV. COMPOSITE. 



Fl. surrounded by an involucre formed of scales (phyllaries), 

 collected together in a head looking like a single flower. Cal. 

 superior ; limb inconspicuous or forming a toothed bristly or 

 feathery pappus. Cor. tubular or ligulate ; both kinds in the 

 same head or only one of them. Stem. 5, inserted in the tube ; 

 filaments free; anthers united into a tube surrounding the style, 

 often with tails at their base. Fr. indehiscent, dry, with an 

 erect seed without perisperm. No stipules. 



The following arrangement of the genera is different from that 

 used in the arrangement of the species. In cases of difficulty 

 they may both be used with advantage. 



Suborder I. CORYMBIFER^E. 



Flowers of the disk tubular and perfect ; marginal flowers 

 often ligulate and female or neuter. Style not swollen below 

 its branches. Juice watery. 



A. Pappus more or less hairlike. 



* Anthers without bristles at their base. 



"\ Leaves opposite, cauline. 



(1.) 1. EUPATORIUM. Heads few-flowered. Phyll. imbri- 

 cate, oblong. Receptacle naked. Fl. all tubular-funnQl- 

 sli&-pQ([, perfect (reddish purple). Anth. included. Branches 

 of the style exserted, cylindrical, blunt. 



tt Leaves radical. 



(2.) 2. PETASITKS. Heads many-flowered. Fern. fl. filiform, 

 obliquely truncate or shortly ligulate, in many rows in the 

 fern, heads, none or in 1 row in the male heads. Male fl. 

 tubular, few and central in the fern, heads, occupying the 

 whole disk in the male heads. Receptacle naked! Phyll. 

 in one row. Subdiaecious. Heads panicled. 



(3.) 3. TUSSILAGO. Heads many-flowered. Fl. of ray nar- 

 rowly ligulate, fern, iu many rows; of disk male, tubular, 

 5-cleft. Receptacle naked. Phyll. in 1 row, with mem- 

 branous margins. Heads solitary. 



