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Are Melilotus albus and M. officinalis conspecific?

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Abstract

The principal economic species of the genus Melilotus are white sweet-clover (Melilotus albus) and the extremely similar yellow sweet-clover (M. officinalis). Although they are widely recognized as distinct species, some influential references in North America reduce the former to a subspecific rank or even merely a conspecific synonym of the latter. Given their importance and the large numbers of germplasm collections, the doubt needs to be resolved. This review of relevant published evidence finds that in addition to the difference in floral colour, the traditional segregation of the two as distinct species is best supported by very strong reproductive barriers as well as divergent DNA sequences in three barcoding genes. Additional but weaker confirmation of separateness is provided by studies reporting differences in external morphology, biochemistry, seed protein profiles, karyotype and DNA microsatellites.

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Acknowledgements

We thank J. Hsiung for preparing the drawings in Fig. 2 and S. Mechanda for assistance in preparing the manuscript. Two anonymous reviewers provided useful comments on the manuscript.

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  1. Agriculture and Agri-Food Canada, Science and Technology Branch, Ottawa Research and Development Centre, 960 Carling Ave., Saunders Building (#49), Ottawa, K1A 0C6, Canada

    Stephen Darbyshire & Ernest Small

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  1. Stephen Darbyshire
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  2. Ernest Small
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Correspondence to Stephen Darbyshire.

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Darbyshire, S., Small, E. Are Melilotus albus and M. officinalis conspecific?. Genet Resour Crop Evol 65, 1571–1580 (2018). https://doi.org/10.1007/s10722-018-0627-4

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