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Phipps, J.B. 2016.

STUDIES IN MESPILUS, CRATAEGUS, AND ×CRATAEMESPILUS (ROSACEAE), I. DIFFERENTIATION OF MESPILUS AND CRATAEGUS, EXPANSION OF ×CRATAEMESPILUS, WITH SUPPLEMENTARY OBSERVATIONS ON DIFFERENCES BETWEEN THE CRATAEGUS AND AMELANCHIER CLADES

. Phytotaxa. 257, 3 (Apr. 2016), 201–229. DOI:https://doi.org/10.11646/phytotaxa.257.3.1.