. A textbook of botany for colleges and universities ... Botany. 648 ECOLOGY diversity in branching is complicated and but vaguely understood. If the terminal bud of the erect main shoot is removed, certain strong lateral branches hitherto ascending obliquely soon begin to grow erect (as in Picea), or buds hitherto inactive develop into erect shoots (as in Araucaria). As in roots, the main axis seems to inhibit verticality in. Fig. 955. — Alpine spruces (Picea) and firs (Abies), illustrating the spirelike contour and excurrent habit that is characteristic of various conifers of high altitudes;
. A textbook of botany for colleges and universities ... Botany. 648 ECOLOGY diversity in branching is complicated and but vaguely understood. If the terminal bud of the erect main shoot is removed, certain strong lateral branches hitherto ascending obliquely soon begin to grow erect (as in Picea), or buds hitherto inactive develop into erect shoots (as in Araucaria). As in roots, the main axis seems to inhibit verticality in. Fig. 955. — Alpine spruces (Picea) and firs (Abies), illustrating the spirelike contour and excurrent habit that is characteristic of various conifers of high altitudes; Rocky Mountains, Mont. — Photograph supplied by Elrod. the lateral branches. However, aerial stems differ strikingly from roots in that light is an important factor in determining the orientation of lateral branches; lateral stems, even those that descend, usually grow in the direction of maximum incident light. The advantages of conical shape, elongation, and stem twisting. — Other things being equal, the greater the power of stems to elongate and. 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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