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This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)
“Cuiguan” pear spur flower bud development under natural conditions in 2019. Photographs and scanning electron micrographs of spur flower buds on June 19 (A), July 31 (B), August 28 (C), September 11 (D), and September 25 (E). The bottom panel for each time-point is a magnified image of one of the flower buds in the upper panel. sp, sepal primordium; pp, petal primordium; triangles, stamen primordium; and asterisks, pistil primordium.