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CCDB → Angiosperms → Rosaceae → Crataegus → Crataegus douglasii Lindl.
| Name | Accepted Name | Gametophytic(n) | Sporophytic(2n) | Data Source | reference | ||
| Crataegus douglasii Lindl. | Crataegus douglasii Lindl. | 68 | IPCN online | Brunsfeld, S. J. & F. D. Johnson. 1990. Cytological, morphological, ecological and phenological support for specific status of Crataegus suksdorfii (Rosaceae). Madroño 37: 274–282. | |||
| Crataegus douglasii var. douglasii | Crataegus douglasii Lindl. | 68 | IPCN online | Campbell, C. S. & T. A. Dickinson. 1990. Apomixis, patterns of morphological variation, and species concepts in subfam. Maloideae (Rosaceae). Syst. Bot. 15: 124–135. | |||
| Crataegus douglasii Lindl. | Crataegus douglasii Lindl. | 68 | IPCN67-71 | GLADKOVA, V.N. 1968. Karyological studies on the genera Crataegus L. and Cotoneaster Medik. (Maloideae) as related to their taxonomy. (In Russian) Bot. Zurn. 53: 1263-1273. | |||
| Crataegus douglasii Lindl. | Crataegus douglasii Lindl. | c.17 | IPCN67-71 | TAYLOR, R.L., & G.A. MULLIGAN. 1968. Flora of the Queen Charlotte Islands. Part 2. Cytological aspects of the Vascular Plants. Queen's Printer, Ottawa. pp. 148. | |||
| ! | Crataegus douglasii Lindl. | Crataegus douglasii Lindl. | c.51 | Darlington, 1955 | Longley 1924b |