. A textbook of botany for colleges and universities ... Botany. STEMS 739 Amorpha canescens, which are sometimes one and sometimes the other, might throw light upon the problem. The advantages of variation in stem form. — The capacity for dif- ferential elongation possessed by aquatic stems and by many aerial stems when submerged by sand is of obvious advantage in that the lift- ing of the leaves into the light and the air is thus made possible. Of unusual significance is stem dwarfness, as illustrated by cushion plants and by the Krummhoh, since such habits are admirably suited for pro- tect
. A textbook of botany for colleges and universities ... Botany. STEMS 739 Amorpha canescens, which are sometimes one and sometimes the other, might throw light upon the problem. The advantages of variation in stem form. — The capacity for dif- ferential elongation possessed by aquatic stems and by many aerial stems when submerged by sand is of obvious advantage in that the lift- ing of the leaves into the light and the air is thus made possible. Of unusual significance is stem dwarfness, as illustrated by cushion plants and by the Krummhoh, since such habits are admirably suited for pro- tection, especially from excessive transpiration. Such protection is due in large part to the reduced surface exposure resulting from the compact. Figs. io6i, 1062. — Spinose branches; 1061 A, a spinose branch of the wild crab apple (Pyrus corofiaria) in its first year; note that the terminal bud soon ceased to develop; 1061 B, a similar branch in its second year, showing a lateral bud that continued to develop ; 5, leaf scar indicating the position of a leaf of the first season; 1062, a compound spi- nose branch of a hawthorn (Crataegus punctata), showing that such spines are branches whose terminal buds soon cease development; note that leaves occur on the lateral branches (/), as well as on the main axis (a).. 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 Coulter, John Merle, 1851-1928; Barnes, Charles Reid, 1858-1910, joint author; Cowles, Henry Chandler, 1869- joint author. New York, Cincinnati [etc] American book company
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