. Notes on the life history of British flowering plants. Botany; Plant ecology. AMENTACEiE 375 in groups of three, on the scales of the cone-like fruit. Each of the hardened cone-scales is formed by the union of the three bracts which subtend the group of female flowers (see Figs. 295, 296). We have two species—the Common Birch, a tree with pointed leaves {B. alba); and B. nana, a shrub with small orbicular leaves (see Viola palustris, p. 28). The colouring is rich and varied : the stems white and black, boughs coppery,. Fig. 295.—Cone-scale of Birch, formed by union of the bract B, and the pa
. Notes on the life history of British flowering plants. Botany; Plant ecology. AMENTACEiE 375 in groups of three, on the scales of the cone-like fruit. Each of the hardened cone-scales is formed by the union of the three bracts which subtend the group of female flowers (see Figs. 295, 296). We have two species—the Common Birch, a tree with pointed leaves {B. alba); and B. nana, a shrub with small orbicular leaves (see Viola palustris, p. 28). The colouring is rich and varied : the stems white and black, boughs coppery,. Fig. 295.—Cone-scale of Birch, formed by union of the bract B, and the pair of bracteoles, a, b. Much enlarged. See next figure. Fig. 296.—Diagram of a three-fiowered group from the female catkin of Birch. A, posi- tion of axis of catkin ; ^, bract .subtending the group of ilowers ; a, b, bracteoles ; 1, median ; 2 and 3, lateral flowers. twigs purple, and leaves green or gold according to the variety and the season of year. The pleasant smell of Eussian leather is said to be given by an oil distilled from the Common Birch. Carpinus (Hornbeam) Monoecious wind flowers ; males with about 12 stamens. The fruit is small, one-seeded, and very hard, attached to a long, leafy, unequally three-lobed bract, so that it is easily carried by wind. 0. Betulus.—A group of two flowers is borne in the axil of each bract of the female catkin (Figs. 297, 298). This group of two is comparable with the three-flowered group in Birch, the central flower being suppressed. The main bract B, subtending the group, plays no part in the formation of the cupule; the pair of three-lobed. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lubbock, John, Sir, 1834-1913. London, New York, Macmillan and Co. , Ltd.
Size: 1516px × 1647px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlub, bookcentury1900, bookdecade1900, booksubjectbotany
