. Morphology of angiosperms (Morphology of spermatophytes. Part II). Angiosperms; Plant morphology. 16 MORPHOLOGY OF ANGIOSPERMS in two categories, and three have been proposed, as follows: (1) actinomorphic, in which the planes of symmetry are as numer- ous as the members of a cycle; (2) isobilateral, in which there are two planes of symmetry, but the halves produced by one plane are unlike those produced by the other (Dicentra, Cru- ciferae, etc.) ; and (3) zygomorphic, in which there is only one plane of symmetry (Fig. 2). These categories are expressions of certain' laws of growth, and tha
. Morphology of angiosperms (Morphology of spermatophytes. Part II). Angiosperms; Plant morphology. 16 MORPHOLOGY OF ANGIOSPERMS in two categories, and three have been proposed, as follows: (1) actinomorphic, in which the planes of symmetry are as numer- ous as the members of a cycle; (2) isobilateral, in which there are two planes of symmetry, but the halves produced by one plane are unlike those produced by the other (Dicentra, Cru- ciferae, etc.) ; and (3) zygomorphic, in which there is only one plane of symmetry (Fig. 2). These categories are expressions of certain' laws of growth, and that they are somewhat funda-. 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; Chamberlain, Charles Joseph, b. 1863. New York, D. Appleton
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