Achillea. | - “XLIIL COMPOSITH. 241 
pink rays, and a yellow disk. Involucres ovoid or hemispherical, the bracts 
imbricated, only slightly scarious on the edges. Receptacle small, not 
convex, with scales between the florets. Achenes without any pappus. 
Style nearly that of Senecio. 
A considerable European and west Asiatic genus, divided by modern 
botanists into two sections or genera, represented by the two British species, 
but separated by very trifling characters. 
Leaves linear, serrated. Flower-heads few, hemispherical . 1. A. Plarmica. 
Leaves much divided. Flower-heads numerous, small, and 
ovoid . “ “hla da ily ala suamidl” A spade , Ane . 2. A, Millefolium, 
1, A. Ptarmica, Linn, (fig. 530). Sneezewort Achillea, Sneezewort. 
—Rootstock perennial and creeping, Stems erect and glabrous, 1 to 2 
feet high, nearly simple. Leaves rather broadly linear, and regularly 
serrate. Flower-heads few, in a loose terminal corymb.  Involucres 
hemispherical, slightly cottony, smaller than in Anthemis, but much 
larger than in A. Millefolium. Florets of the ray generally from 10 to 
15, short, broad, and white ; those of the disk numerous, interspersed with 
small linear scales. 
In moist, chiefly hilly pastures, in northern and central Europe and 
Russian Asia, becoming a mountain plant in southern Europe, yet not 
extending to the Arctic regions. Common in Britain. FJ. summer, rather 
late, | 
2, A. Millefolium, Linn. (fig. 531). Milfoil Achillea, Milfoil or 
Yarrow.—Stock perennial, creeping underground, with numerous short, 
leafy barren branches, and erect, almost simple flowering stems, about a 
foot high. leaves oblong, or linear in their outline, but finely cut into 
numerous short, but very narrow and deeply pinnatifid segments, Flower- 
heads numerous, small, ovoid, in a dense terminal corymb. Florets of the 
ray seldom above 5 or 6 in each head, white or pink. 
In pastures, meadows, waste places, etc., very abundant in Europe and 
Russian Asia fromthe Mediterranean to the Arctic Circle, and extends over 
a great part of North America. It is also one of the commonest of British 
plants. Fl. the whole summer, It varies with the foliage nearly glabrous, 
or densely covered with white woolly hairs. 
XVI. DIOTIS. 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 off. 
1, D. maritima, Cass, (fig. 532). Sea Diotis, Cotton Weed.— 
Rootstock perennial and creeping ; the stems branching at the base, hard 
and almost woody, seldom a foot high, covered, as well as the leaves and 
inyolucres, with a dense, white, cottony wool. Leaves alternate, oblong, 
entire or slightly toothed, about half an inch long. Flower-heads nearly 
globular, about 4 lines diameter, in dense terminal corymbs. Florets 
yellow and small. Receptacle 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, it 
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