coMPOsiT^i 299' 



plants. Fl. the whole summer. It varies with the foKage nearly glabrous 

 or densely covered with white wooUy hairs. 



XIII. DZOTIS. DIOTIS. 



A single, very cottony species, distinguished generally from Achillea by 

 the florets, all tubular, with two projecting ears at the base, which enclose 

 the achene and remain upon it after the upper part falls oiF. 



1. Sea Diotis. Diotis maritima, Cass. 

 (Santolina. Eng. Bot. t. 141.) 



Eootstock perennial and creeping ; the stems branching at the base, hard 

 and almost woody, seldom a foot high, covered, as well as the leaves and 

 involucres, with a dense, white, cottony wool. Leaves alternate, oblong, 

 enthe or slightly toothed, about half an inch long. Flower-heads nearly 

 globular, about 4 hnes diameter, in dense terminal corymbs. Florets yellow 

 and smaU. Eeceptacle convex, with scales between the florets. Achenes 

 without pappus or border except the persistent base of the floret. 



In maritime sands on the Mediterranean and Atlantic. Extends on the 

 English coasts up to Anglesea on one side and Suffolk on the other, but 

 not recorded from Ireland. Fl. end of summer or autumn. 



XIV. TANSY. TANACETUM. 



Herbs, with much divided, alternate leaves. Flower-heads hemisphericeil, 

 in terminal coi-ymbs. Involucral bracts imbricated, scarious at the edges. 

 Eeceptacle without scales. Florets yellow, all tubular, or the outer ones 

 ligulate but not longer than the others. Achenes angiilar, with a flat top, 

 without any pappus. 



A smaU genus, from the Mediterranean and Caucasian regions, difierino- 

 from Artemisia technically in the shape of the achene, but more evidently in 

 the larger, more yeUow, corymbose, not paniculate, flower-heads. 



1. Common Tansy. Tanacetum vulgare, Linn. 

 (Eng. Bot. t. 1229.) 



A stout, erect perennial, 2 to 3 feet high, glabrous or shghtly downy, 

 vrith a strong scent and bitter savour. Eootstock creeping. Leaves rather 

 large, pinnate, with oblong-linear, pinnatifid or toothed segments. Flower- 

 heads numerous, hemispherical, about 4 Hnes dianieter, 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 introduced. Fl. end of summer. 



XV. ARTEMISIA. ARTEMISIA. 



Herbs or shrubs, usually liighly 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 



