. Morphology of angiosperms (Morphology of spermatophytes. Part II). Angiosperms; Plant morphology. Fig. 2.—A, radial symmetry (Lilium tigrinum); £, isobilateral symmetry (Capsella Bursa-pastoris) ; 0, zygomorphic symmetry (Scrophularia nodosa). mental may be inferred from the fact that they are persistent through great groups of plants. While these and other evolutionary tendencies are to be observed among flowers, it is evident that they are not neces- sarily expressed simultaneously. For example, the spiral and cyclic arrangements are associated in Ranunculus, zygomorphy is associated with


. Morphology of angiosperms (Morphology of spermatophytes. Part II). Angiosperms; Plant morphology. Fig. 2.—A, radial symmetry (Lilium tigrinum); £, isobilateral symmetry (Capsella Bursa-pastoris) ; 0, zygomorphic symmetry (Scrophularia nodosa). mental may be inferred from the fact that they are persistent through great groups of plants. While these and other evolutionary tendencies are to be observed among flowers, it is evident that they are not neces- sarily expressed simultaneously. For example, the spiral and cyclic arrangements are associated in Ranunculus, zygomorphy is associated with polypetaly and hypogyny among the papil- ionaceous Leguminosae, epigyny is associated with polypetaly among the Umbelliferae, and sympetaly and zygomorphy are associated with hypogyny among the Labiatae. It is among the Compositae that practically every evolutionary tendency mentioned finds its highest expression. Tt is onlv hv striking an average that such characters may be used in roughly placing a family in its evolutionary position, commonly called its " relative ; The classic memoir mi the organogeny of the flower is Payer's Traite d'organogenie de la fleur (1857), but the sub- ject has not been developed since as it deserves. In the case of spiral flowers, in which the torus elongates more or less, the. 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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