SPECIES AND VARIETIES. 377 



(28) Tanacetum. TANSY. 



T. vulgare: stem 2-3 feet high; leaves bipinnatifid, the 

 leaflets serrated; heads in a terminal corymb ; florets golden 

 yellow; whole plant powerfully scented. Way-sides. Fl. 

 August, September. 



(29) Senecio. 



* Florets all tubular, no ray. 



S. vulgaris : annual ; stem 6-12 inches high, branching; 

 leaves half-clasping, pinnatifid, the segments distant, oblong, 

 obtuse, and together with the rachis and auricles acutely and 

 unequally toothed, the lower ones narrowed into a stalk ; 

 heads small, in clustered racemes ; florets yellow. Groundsel. 

 Common everywhere. Flowers the whole year. 



** Florets of tlie ray small, and rolled ~baclc. 

 S. sylvaticus : annual ; stem 12 feet high, erect, more 

 or less branched, hairy ; leaves deeply pinnatifid, downy, the 

 segments oblong, unequally toothed ; heads corymbose ; florets 

 yellow, those of the ray sometimes wanting. Dry and gravelly 

 hills. Fl. July to September. 



*** Florets of the ray spreading, conspicuous. 



S. Jacobsea : stem 2-3 feet high, smooth, striated, branched, 

 leafy ; leaves glabrous, the radical ones oblong-obovate, attenu- 

 ated below, lyrate-pinnatifid, stalked, those of the stem sessile, 

 bipinnatifid, with spreading, oblong, deeply and irregularly- 

 toothed and cut segments, the lowermost of them much divided, 

 clasping ; florets yellow, the heads collected in erectly- 

 branched corymbs. Ragwort. Waste ground. Fl. July to 

 September. 



