Palmer, Ernest (1946). "Crataegus in the Northeastern and Central United States and Adjacent Canada". Brittonia. 5 (5): 471–490. doi:10.2307/2804829. JSTOR2804829. S2CID23125349.
Davis, Wilmer; Rose, R. Catlin (1912). "The Effect of External Conditions Upon the After-Ripening of the Seeds of Crataegus mollis". Botanical Gazette. 54 (1): 49–62. doi:10.1086/330863. S2CID84608408.
efloras.org
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Palmer, Ernest (1946). "Crataegus in the Northeastern and Central United States and Adjacent Canada". Brittonia. 5 (5): 471–490. doi:10.2307/2804829. JSTOR2804829. S2CID23125349.
semanticscholar.org
api.semanticscholar.org
Palmer, Ernest (1946). "Crataegus in the Northeastern and Central United States and Adjacent Canada". Brittonia. 5 (5): 471–490. doi:10.2307/2804829. JSTOR2804829. S2CID23125349.
Davis, Wilmer; Rose, R. Catlin (1912). "The Effect of External Conditions Upon the After-Ripening of the Seeds of Crataegus mollis". Botanical Gazette. 54 (1): 49–62. doi:10.1086/330863. S2CID84608408.