Order XVIII
BIXINEÆ.
The plants of this order are few in number, and not remarkable either for beauty or use. The Bíxa orellána is chiefly known for producing the seed called in the shops Arnotta (Rocon, Fr.), and used for coloring cheese; the properties of the Arnotta are slightly purgative and stomachic. They are all bushes or small trees, and mostly tropical. Azaras, Chilian shrubs with fragrant flowers, are not yet known in the gardens of Europe. 1178 Bíxa W.
ORDER XIX. 1179 Prockia L.
CISTINEÆ.
The common rock roses of our gardens give an accurate idea of this order, which contains little else. They are all very ornamental, and particularly well calculated for covering rockwork. The species of Cistus and Helianthemum have been multiplied by Dunal in an extravagant manner, as has been well demonstrated by Mr. Bentham. They are natives of most parts of the world in dry elevated places. The gum called Ladanum is the produce of some kinds of Cistus; it exhales a fragrant perfume when burnt, and possesses slightly tonic and stomachic properties. 1089 Hudsónia W. 1197 Cistus J. 1198 Heliánthemum J. 222 Lechea W.
NATURAL ARRANGEMENT.
Section 3. Ovarium solitary. Placenta central.