Order Cviii
BORAGINEÆ. 310 Cúscuta W. 603 Dichóndra W. 391 Rétzia Th. 359 Pyxidanthéra Mi.
True Boragineæ are chiefly herbaceous plants, with alternate exstipulate leaves, the surface of which is covered over with minute asperities, and with flowers arranged in one-sided spikes or racemes, occasionally solitary. Each flower has also four distinct little nuts or seeds, as they are commonly called. Some Echiums 3Z3 NATURAL ARRANGEMENT. and a few more are shrubs. They are found abundantly in Europe, Siberia, and the North of Africa, less commonly in India, and the equinoctial parts of the world; in some quantity in North America, and in tolerable abundance in New Holland. Within the tropics the order is principally represented by Heliotropiums and Tournefórtias; in colder latitudes by Anchusas, Cynoglossums, herbaceous E'chiums, and the like. Some are mere weeds, quite unworthy of culture; others are eminently beautiful, as many Echiums, Onósmas, Onosmódiums, Symphytums, and others. În general they are mucilaginous and emollient, qualities which are especially abundant in the root of Symphytum and Cynoglossum. Pure nitre has been found in several plants of the order. A red color is given out by Anchúsa tinctória, Lithospermum tinctórium, and Onósma echioides, which is used in dying. Several plants are employed on the same account in America. The Hydrophylleæ are often considered as distinct, on account of their capsular fruit and cartilaginous albumen. One or two of these are pretty plants, but most of them mere weeds. 316 Coldénia W. 325 Heliotropium L. 326 Myosotis B. P. 327 Echinospermum Sw. 328 Máttia Sch. 329 Tiarídium Lehm.
Tribe 1. ASPERIFOLIE. 330 Lithospérmum W. 331 Bátschia Mich. 332 Onósma W. 333 Anchúsa W. 334 Sýmphytum W. 335 Onosmódium Mich. 336 Cynoglossum W. 337 Omphalódes Lehm. 338 Pulmonária W. 339 Cerínthe W. 340 Borágo W. 341 Trichodésma R. Br. 342 Asperúgo W. 343 Nónea Mönch. 344 Lycópsis W. 345 Echium W. 346 Tournefórtia R. Br. 347 Nolána W.
Tribe 2.
HYDROPHYLLEÆ. 372 Hydrophyllum W. 373 Phacélia Mich. 386 Nemóphila Nutt. 432 Ellísia W.