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- W2053277584 abstract "Crataegus section Douglasii exhibits variation in stamen number per flower typical for the genus throughout North America. To understand the developmental basis for this variation we studied the early floral ontogeny of the three taxa in section Douglasii: C. douglasii (both Pacific northwest and the upper Great Lakes basin), C. rivularis , and C. suksdorfii. Crataegus suksdorfii , like all known diploid Crataegus , has ≈20 stamens; the two other taxa have ≈10 stamens, a condition associated only with polyploidy. In all taxa petal primordia and a whorl of five pairs of stamen primordia develop from five common primordia. The 10‐stamen∗∗∗ condition results from loss of two whorls of five stamens that are subsequently formed in C. suksdorfii. Loss of these two whorls in the 10‐stamen taxa is the result of neither a smaller floral apex at initiation, nor a smaller flower at anthesis. Stamen number variability, particularly in C. douglasii and C. rivularis , is the result predominantly of fewer than two stamen primordia developing between adjacent petal primordia. Pollen production in C. douglasii is half that in C. suksdorfii because of the reduction in stamen number. The results are presented and discussed in terms of morphogenetic explanations of meristic variation." @default.
- W2053277584 created "2016-06-24" @default.
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- W2053277584 date "1996-08-01" @default.
- W2053277584 modified "2023-10-05" @default.
- W2053277584 title "North American black-fruited hawthorns. II. Floral development of 10- and 20-stamen morphotypes in<i>Crataegus</i>section<i>Douglasii</i>(Rosaceae: Maloideae)" @default.
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- W2053277584 doi "https://doi.org/10.1002/j.1537-2197.1996.tb12793.x" @default.
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