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Floral Structure, Systematics, and Phylogeny in Trochodendrales

Peter K. Endress
Annals of the Missouri Botanical Garden
Vol. 73, No. 2 (1986), pp. 297-324
DOI: 10.2307/2399115
Stable URL: http://www.jstor.org/stable/2399115
Page Count: 28
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Floral Structure, Systematics, and Phylogeny in Trochodendrales
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Abstract

Study of the floral structure of Cercidiphyllum, Euptelea, Tetracentron, and Trochodendron, at anthesis and in earlier developmental phases, revealed new features of macrosystematic interest. They include the presence of rudimentary tepals in Trochodendron, and valvate anther dehiscence, similar exine structure, and similar nectaries on dorsal carpel bulges in Trochodendron and Tetracentron. These and other similarities point to a close relationship between Trochodendron and Tetracentron, which together are formally best treated as a family Trochodendraceae. Other new characters, such as zygomorphy or bilateral symmetry of the flowers in early developmental phases and relatively similar anther differentiation, in addition to the established similarities, corroborate the relative homogeneity of the four genera, which can be seen as members of a single order Trochodendrales. The position of this order is intermediate between the Magnoliidae and Hamamelidae so that the formal inclusion of the order in either group can be justified.

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