TY - JOUR AU - AB - An abundance of circumstantial evidence has led earlier workers to believe that apomixis was a common phenomenon in North American Crataegus. However, direct proof was lacking. In this paper, working with accessions of Crataegus pruinosa (Wendl.) K. Koch, sens. lat., a common and rather variable species of eastern North America, we present cytological proof of apomixis. This paper demonstrates the existence of apospory and documents the development of the aposporous embryo sac. Pseudogamy is inferred. TI - CYTOLOGICAL PROOF OF APOMIXIS IN CRATAEGUS (ROSACEAE) JF - American Journal of Botany DO - 10.1002/j.1537-2197.1979.tb06207.x DA - 1979-02-01 UR - https://www.deepdyve.com/lp/crossref/cytological-proof-of-apomixis-in-crataegus-rosaceae-SlJucm0el9 SP - 149 EP - 155 VL - 66 IS - 2 DP - DeepDyve ER -