Studies in Crataegus (Rosaceae, Maloideae), XV. Patterns of Morphometric Variation in Crataegus Series Rotundifoliae in Ontario

P. G. Smith, J. B. Phipps, Studies in Crataegus (Rosaceae, Maloideae), XV. Patterns of Morphometric Variation in Crataegus Series Rotundifoliae in Ontario, Systematic Botany, Vol. 13, No. 1 (Jan. - Mar., 1988), pp. 97-106