The Bluebottle or Cornflower (_Centaurea Cyanus_) is a pretty cornfield Composite, not uncommon in many parts, blooming from June to August. The plant, represented on Plate IV, is covered with loose, cottony hairs, and grows from one to two feet high. The heads of flowers are about an inch in diameter, solitary on long, terminal stalks, surrounded by an oval involucre of closely-overlapping bracts with sharp points and toothed, membranous margins. The receptacle is flat, with silvery bristles between the florets. All the florets are tubular; the central ones of a bluish-purple colour, with purple anthers; and the outer ones much larger, curved, irregular, and bright blue. The fruit is surmounted by a pappus of short, simple hairs. One of the most beautiful of the corn-field flowers is the Corn Marigold or Yellow Ox-eye Daisy (_Chrysanthemum segetum_), easily distinguished by its rather large flower-heads, solitary on terminal peduncles, with bright golden-yellow ray and disc. It grows from twelve to eighteen inches high, and flowers from May to July. It may be identified by the aid of the coloured illustration on Plate VII. [Illustration: THE SCARLET PIMPERNEL.] The Corn Chamomile (_Anthemis arvensis_), of the same order, is not unfrequently seen in corn fields, flowering from June to August. It is much like the Scentless Mayweed (p. 188) and the Common Chamomile (p. 268) in general appearance, but may be easily distinguished with a little care. It is a rather coarse plant, more or less clothed with a silky down; and its freely-branched stem is usually erect, and from one to two feet high. The leaves are pinnate, with leaflets divided into very narrow, almost hairlike segments; and the flower-heads are rather large, with white ray and yellow disc, solitary on the tops of leafy stalks. The involucre bracts are acute; the receptacle conical; and ray florets always possess a style. [Illustration: THE CLIMBING BISTORT.] The Stinking Chamomile or Stinking Mayweed (_Anthemis Cotula_) is another similar corn-field plant, but it may be readily recognised by the minute glands dotted over its surface, the acrid secretion of which emits a f[oe]tid odour when rubbed, and often blisters the hand. The plant is generally smooth, with an erect, branched stem, from nine to fifteen inches high; and pinnate leaves with leaflets divided into short, narrow, pointed lobes. The flowers are similar to those of the previous species, on the tops of long, leafy stalks; but the receptacle, at first convex, lengthens to a tall cone; and the white ray-florets have no style. The involucre bracts are also very narrow, bristly at the top; and the fruits are rendered rough by numerous little glandular projections. This plant flowers from June to September.