949 THE COMPOSITE FAMILY. | [ Diotis. 
is found also on the south coasts of Ireland, and the Channel Islands. FJ, 
end of summer or autumn, ae a 
XVII. TANACETUM. TANSY. 
Herbs, with much divided, alternate leaves, Flower-heads hemi- 
spherical, in terminal corymbs. Involucral bracts imbricated, scarious at 
the edges. Receptacle without scales. Florets yellow, all tubular, or the 
outer ones ligulate but not longer than the others. Achenes angular, with 
a flat top, without any pappus. 
A small genus, from the Mediterranean and Caucasian regions, differing 
from Artemisia technically in the shape of the achene, but more evidently 
in the larger, more yellow, corymbose, not paniculate, flower-heads. | 
1, ©. vulgare, Linn. (fig. 533). Common Tansy.—A stout, erect 
perennial, 2 to 3 feet high, glabrous or slightly downy, with a strong 
scent and bitter savour. Rootstock creeping. Leaves rather large, pinnate, — 
with oblong-linear, pinnatifid or toothed segments. Flower-heads numerous, 
hemispherical, about 4 lines diameter, 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, perhaps always where introduced. 7. end of summer, 
XVIII. 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. 
Stems spreading, much branched. Segments of the leaves 
narrow-linear or subulate. 
Stem and leaves cottony white. Involucres narrow-ovoid, or 
cylindrical, cottony : ; ; 4 . , ; : . 2. A. maritima. 
Stem and leaves green or reddish. Involucres ovoid, glabrous 1. A, campestris. 
Flowering stems or branches tall and erect. Segments of the 
leaves flat, broadly linear, or lanceolate. 
Leaves green above, white underneath, with pointed segments, 3. A. vulgaris. 
Leaves silky, whitish on both sides, with obtuse segments | . 4 A. Absinthium. 
The shrubby Southernwood and the Tarragon of our gardens are species 
of Artemisia; the latter (A. Dracunculus) is one of the very few species in 
which the leaves are not dissected. 
1, A. campestris, Linn. (fig. 534). Meld Artemisia.—Stock her- — 
baceous and hard, or shrubby, low, and branched; the annual branches 
twiggy, very spreading or procumbent, a foot long or more, nearly glabrous, 
