Dickinson, T. A.1*, Evans, R. C.2 & C. S. Campbell3.
(1) ROM CBCB; (2) Biology Department, Acadia University; (3) Biological
Sciences Department, University of Maine.
Hawthorns (Crataegus) and medlars (Mespilus) appear to be sister genera in the apple subfamily (Maloideae) of the Rosaceae. We are analyzing data on sequence variation in ITS1, 5.8S rDNA, and ITS2 in a sample of Crataegus species representing most of the 15 sections of the genus, and both species of Mespilus (Eurasian M. germanica L. and the Arkansas endemic M. canescens Phipps). For outgroups we have used Amelanchier, Malus, and Pyrus. Results obtained so far cast some light on relationships between the two genera and between stamen-number morphotypes in North American sections of Crataegus.
The talk outlined here was originally presented at Botany 2000 in Portland
OR, 6-9 August 2000. The original abstract was published in American Journal
of Botany 87(6, Supplement): 122-123 (2000) and can be seen HERE.
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Author: TAD & 3 more