. A textbook of botany for colleges and universities ... Botany. Figs. 780, 781.—^ Branches of a honeysuckle (Lonicera); 780, an erect branch, showing characteristic decussate phyllotaxy (p. 549); 781, a horizontal branch, in which stem twisting has brought the leaves into a common plane, obscuring the decussate phyl- lotaxy. (figs. 780, 781; also figs. 882-884, 895; see discussion of stems as organs of leaf display, p. 645). Leaf mosaics. — Since each leaf assumes the best lighted position possible, there is in general an absence of overlapping in the leafage as a whole, and if the foliage is
. A textbook of botany for colleges and universities ... Botany. Figs. 780, 781.—^ Branches of a honeysuckle (Lonicera); 780, an erect branch, showing characteristic decussate phyllotaxy (p. 549); 781, a horizontal branch, in which stem twisting has brought the leaves into a common plane, obscuring the decussate phyl- lotaxy. (figs. 780, 781; also figs. 882-884, 895; see discussion of stems as organs of leaf display, p. 645). Leaf mosaics. — Since each leaf assumes the best lighted position possible, there is in general an absence of overlapping in the leafage as a whole, and if the foliage is dense, most of the available leaf space becomes occupied. The combined result of the absence of overlap and of the maximum occupation of space often is spoken of as a leaf mosaic. The perfection of this mosaic sometimes is enhanced by the fitting of projecting angles into reentrants (as in Hedera), by the reciprocal ar- rangement of unsymmetrical leaves (as in Celtis and in Begonia, fig. 895), or by the intercalation of small leaves between larger leaves (as in Sela- ginella, fig. 896). Excellent mosaics are seen in climbing plants (as in. 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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