The Comparative Internal Morphology of Seeds

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Abstract
Using the genus as the base of study and analyzing all representative spp. except in those few instances wherein they exceeded 50 spp. per genus, the gross internal morphology of seeds of 1287 genera was studied. Particular attention was focussed on the size, shape and position of the embryo in its relation to the endosperm. Drawings of cross and longitudinal sections of seeds were made in all genera having endosperm and the drawings were grouped into 67 plates according to a new system of seed classification involving 12 basic seed types. The report presents a discussion of the phylogenetic significance of seed morphology and includes a "family tree" for seeds depicting the 12 seed types as successive stages of development along 2 major lines of evolution.

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