Arctium

( Bot. ) A genus of biennials of the Aster family ( Composite ), and including the common burdock. Arcto'tis, n. ( Bot.) A plant of the Aster family, indigenous in Southern Africa, but now cultivated to to some extent here and in Europe. The flower is usually a deep yellow, and in ma ive heads or clusters. Arden'nite, n. [From Ardennes, in France.] ( Min.) A yellow or brownish-yellow silicate, seemingly combined with vanadium, occurring in orthorhombic crystals. Ardisia, n. ( Bot.) An extensive genus of small trees or evergreen shrubs of the family Myrsinaceæ, several of which are frequently seen in gardens and greenhouses. The flowers are white or pinkish in tint.