r) (fig. 2). Some are of
medicinal value, such as _Anthemis_ (chamomile), _Artemisia_ (wormwood),
_Tussilago_ (coltsfoot), _Arnica_. Insect powder is prepared from
species of _Pyrethrum_.

[Illustration: FIG. 3.--Groundsel (_Senecio vulgaris_).

1. Disk-floret. 3. Ray-floret.
2. Same cut vertically. 4. Fruit with pappus.]

The order is divided into two suborders:--_Tubuliflorae_, characterized
by absence of latex, and the florets of the disk being not ligulate, and
_Liguliflorae_, characterized by presence of latex and all the florets
being ligulate. The first suborder contains the majority of the genera,
and is divided into a number of tribes, characterized by the form of the
anthers and styles, the presence or absence of scales on the receptacle,
and the similarity or otherwise of the florets of one and the same head.
The order is well represented in Britain, in which forty-two genera are
native. These include some of the commonest weeds, such as dandelion
(_Taraxacum Dens-leonis_), daisy (_Bellis perennis_), groundsel (fig. 3)
(_Senecio vulgaris_) and ragwort (_S. Jacobaea_); coltsfoot (_Tussilago
Farfara_) is one of the earliest plants to flower, and other genera are
_Chrysanthemum_ (ox-eye daisy and corn-marigold), _Arctium_ (burdock),
_Centaurea_ (knapweed and cornflower), _Carduus_ and _Cnicus_
(thistles), _Hieracium_ (hawkweed), _Sonchus_ (sow-thistle), _Achillea_
(yarrow, or milfoil, and sneezewort), _Eupatorium_ (hemp-agrimony),
_Gnaphalium_ (cudweed), _Erigeron_ (fleabane), _Solidago_ (golden-rod),
_Anthemis_ (may-weed and chamomile), _Cichorium_ (chicory), _Lapsana_
(nipplewort), _Crepis_ (hawk's-beard), _Hypochaeris_ (cat's-ear), and
_Tragopogon_ (goat's-beard).

COMPOSITE ORDER, in architecture, a compound of the Ionic and Corinthian
orders (see ORDER), the chief characteristic of which is found in the
capital (q.v.), where a double row of acanthus leaves, similar to those
carved round the Corinthian capital, has been added under the Ionic
volutes. The richer decoration of the Ionic capital had already been
employed in those of the Erechtheum, where the necking was carved with
the palmette or honeysuckle. Similar decorated Ionic capitals were found
in the forum of Trajan. The earliest example of the Composite capital is
found in the arch of Titus at Rome. The entablature was borrowed from
that of the Corinthian order.

COMPOSITION (Lat. _compositio_, from _componere