This tribe is also considered as a separate order by many botanists; but the principal distinction is the long arillus or skin which enfolds the seeds and gives them the appearance of being winged. The most remarkable genera are _Pyrola_, the Winter Green, of which there are several species common in moist woods in the north of England and Scotland; and _Monotropa_, or Bird’s-nest, parasitic plants which grow on the roots of pine and beech-trees, but are by no means common in England. The species of Pyrola are pretty little evergreen plants, with white flowers, the corollas consisting of five distinct petals, and which have ten stamens, the anthers of which are two-celled, each opening by a pore; the style is single, ending in a capitate stigma cut into five lobes; and the capsule is five-celled. The yellow Bird’s-nest, (_Monotropa Hypopitys_) has a coloured stem, with drooping flowers, and numerous scales instead of leaves, of which it is destitute. The flowers have a coloured calyx cut into four or five segments, and the corolla is in four or five petals. There is an American species with white flowers. CHAPTER VIII. THE ORDER OLEACEÆ, OR JASMINEÆ: ILLUSTRATED BY THE COMMON WHITE JASMINE; THE YELLOW JASMINE; THE PRIVET; THE PHILLYREA; THE OLIVE; THE FRINGE-TREE (_Chionanthus Virginica_); THE LILAC; THE COMMON ASH; AND THE MANNA OR FLOWERING ASH. This order was established by Jussieu, who divided it into two tribes—Jasmineæ and Oleineæ, which are now very generally considered as distinct orders. I have, however, thought it best to keep them together, as I wish to make as few divisions as possible, to avoid burthening the memory of my readers. All the genera in both tribes agree in their flowers having only two stamens, an ovary with two cells, and two seeds in each cell; and anthers with two cells, which open with a long slit lengthways. The species of the Ash have no corolla; but in all the genera where there is one, the filaments of the stamens, which are very short, are inserted in it; and it is generally funnel-shaped—as, for example, the corolla of the Jasmine. Though the ovary is two-celled, and the cells two-seeded, each flower very often only produces one perfect seed. The leaves are generally pinnate. TRIBE I.—JASMINEÆ. [Illustration: FIG. 64.—FLOWER AND LEAF OF THE JASMINE.]