An eclectic ramble through phylogenetic aspects of floral structure includes the following: (1) Sterling's view that the ancestral flowers of Rosaceae had only two ovules per carpel is examined and rejected.(2) Recent observations on the direction of androecial development in various taxa are reviewed, and it is concluded that centrifugality is not as valuable a phylogenetic indicator as some systematists had hoped it would be.(3) An attempt is made to reinterpret the inverted placental bundles of Capparales and the inverted "recurrent" bundles of Nestronia along morphogenetic lines.It is suggested that the inverted orientation is causally related to the initiation and differentiation of these bundles in isolation from previously formed vascular tissue.
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Richard H. Eyde (1975) studied this question.
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