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Abstract
A description of developmental sequences leading to maturity of the megagametophyte in two species of Solidago (L.) is presented to allow comparisons in: (1) dimensional relationships; (2) simultaneity of homotypic meiotic divisions of megasporogenesis; and (3) tetrad formation. A lack of consistency in the coordination of nucellar and integumental development, the occurrence of asynchrony in the mitotic divisions of megagametogenesis, polyantipodality in mature female gametophytes, and ease of tissue clearing are attributes common to both species. They are presented as additional distinguishing features to augment the characterization of the megagametophyte generation of Solidago, a highly plastic genus which is, embryologically, virtually unknown.
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