COMPOSITE. 



435 



1. Common Tansy. Tanacetum vulgare, Linn. (Fig. 517.) 

 (Eng. Bot. 1. 1229.) 



A stout, erect perennial, 2 to 3 feet 

 high, glabrous or slightly downy, with 

 a strong scent and bitter savour. Root- 

 stock creeping. Leaves rather large, 

 pinnate, with oblong-linear, pinnatifid or 

 toothed segments. Flower-heads nu- 

 merous, hemispherical, about 4 lines dia- 

 meter, of a golden yellow, in a large 

 terminal corymb. 



On the edges of fields, roadsides, and 

 waste places, in Europe and Russian 

 Asia, from the Mediterranean to the 

 Arctic Circle. Extends all over Britain, 

 either indigenous or in some places in- 

 troduced. Fl. end of summer. 



Fig. 517. 



XV. ARTEMISIA. ARTEMISIA. 



Herbs or shrubs, usually highly aromatic, with narrow, alternate 

 leaves, usually much divided, and often white or grey, at least on the 

 under side. Flower-heads small, in terminal leafy racemes or panicles. 

 Involucral bracts imbricated, usually loosely cottony, with slightly 

 scarious edges. Florets the length of the involucres, yellow or greenish, 

 either all tubular and 5-toothed, or the central ones tubular, 5-toothed, 

 and male or barren, and the outer ones filiform, or 3-toothed, female, 

 and fertile. Receptacle without scales. Achenes obovate, rounded or 

 narrow at the top, without any pappus. 



A numerous genus, often covering vast tracts of land in eastern 

 Europe and central Asia, and extending over nearly the whole of 

 the northern hemisphere from the Arctic regions to the borders of 

 the tropics. 



Stem spreading, much branched. Segments of the leaves 

 narrow-linear or subulate. 



Stem and leaves cottony-white. Involucres narrow-ovoid 



or cylindrical, cottony 2. Sea A. 



