. Introduction to structural and systematic botany, and vegetable physiology. Botany. 478 ILLUSTRATIONS OF THE NATURAL ORDKES. gent, and that of the Birch is aromatic. The peculiar odor of Russia leather is said to be owing to a pyroligneous oil obtained from Betula alba, or White 921. Ord, Salicaceae {Willow Family). Trees or shrubs, with al- ternate simple leaves, furnished with stipules. Flowers dioecious ; both kinds in aments, and destitute of floral envelopes (achlamyde- ous), one under each bract. Stamens two to several, sometimes monadelphous. Ovary one-celled, many-ovuled ! St
. Introduction to structural and systematic botany, and vegetable physiology. Botany. 478 ILLUSTRATIONS OF THE NATURAL ORDKES. gent, and that of the Birch is aromatic. The peculiar odor of Russia leather is said to be owing to a pyroligneous oil obtained from Betula alba, or White 921. Ord, Salicaceae {Willow Family). Trees or shrubs, with al- ternate simple leaves, furnished with stipules. Flowers dioecious ; both kinds in aments, and destitute of floral envelopes (achlamyde- ous), one under each bract. Stamens two to several, sometimes monadelphous. Ovary one-celled, many-ovuled ! Styles or stigmas two, often two-cleft. Fruit a kind of follicle opening by two valves. Seeds numerous, ascending, furnished with a silky coma! Albu- men none. â Ex. Salix (Willow, Fig. 415-419), and Populus (the Poplar). Trees with light and soft wood: the slender, flexible shoots of several Willows are employed for wicker-work. The bark is bitter and tonic, and contains a peculiar substance (Salicine), which possesses febrifugal qualities. The buds of several Poplars exude a fragrant balsamic resin. FIG. 1170. Young ament of staminate flowers of a Birch (Betula fruticosa?). 1171. One of ithe three-lobed scales of tbe same, enlarged, showing the flowers (stamens) on the inner side. 1172. Ament of pistillate flowers. 1173. Branch in fruit. 1173'. One of the scales with its ,three flowers (pistils) seen from within. 1174. Magnified section of one of the two-celled pis- itilB, displaying the ovule suspended from the summit of each ceU. 1175. The pistils (with their subtending bract) in a more advanced state. 1176. Magnified cross-section of one of the â ovaries. 1177. The mature fruit, with the cell divided vertically; the single seed occupying the cavity ; a mere trace of the other cell being visible. 1178. The seed removed. 1179. The . Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration
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Keywords: ., bookauthorgra, bookcentury1800, bookdecade1850, booksubjectbotany
