Abstract
Crataegus monogyna Jacq. is naturalized in North America, where it has hybridized with native diploid hawthorns at least twice. We provide names for the two nothospecies (as well as for the corresponding nothosections and nothoseries), referring to existing documentation in the literature for nothosp. nov. Crataegus ×ninae-celottiae K.I. Chr. & T.A. Dickinson (C. monogyna × C. punctata Jacq.). New data are provided to further document nothosp. nov. Crataegus ×cogswellii K.I. Chr. & T.A. Dickinson (C. monogyna × C. suksdorfii (Sarg.) Kruschke). In both cases, the striking differences in leaf shape between most New World hawthorns and Old World section Crataegus, and the intermediacy of the hybrids, account for the relative ease with which these hybrids can be recognized. Finally, new sequence data from ITS2 and chloroplast DNA barcoding loci confirm the genetic relationships between the two nothospecies and their respective parents.
Highlights
Crataegus monogyna Jacq. is a widespread species of Crataegus sect
We analyzed data from another project (Zarrei et al http://2012.botanyconference.org/engine/search/index.php?func=detail&aid=536 and unpubl. data) in which ITS2 was cloned for a sample of individuals that included 14 C. suksdorfii, four C. monogyna, three C. punctata and two each of the two hybrids (Table 3)
The hybrid is clearly intermediate with respect to both leaf lobing and style number (STYLE; Fig. 1)
Summary
Crataegus monogyna Jacq. is a widespread species of Crataegus sect. Crataegus that occurs in much of Europe, northern Africa and western Asia. This sample overlapped partially with the cloned ITS2 one (below), and provided an additional two C. suksdorfii, 10 C. monogyna, and five C. punctata individuals, as well as one more of each of the two hybrids (Table 2).
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