A very large genus of American plants, containing many shrubby and arborescent species of very diverse habit, readily distinguished from allied genera by their dioecious flowers. Although there are some 200 species, only one is in general cultivation. Many of the species are resinous and strongly scented, and this name, of Greek origin, was applied to some resinous shrub.

1. B. halimifolia. Groundsel Tree. - A shrub from 6 to 12 feet high with angular branches and obovate or oblong-cuneate coarsely-toothed scurfy leaves very much resembling those of some Chenopodiaceae. Flower-heads small, yellow. The female is the handsomer plant of the two, from its conspicuous silvery pappus. This flourishes near the sea.