Studies in Crataegus (Rosaceae: Maloideae). XIV. The breeding system of Crataegus crus-galli sensu lato in Ontario

Crataegus crus-galli L. sensu lato in southern Ontario is a complex of taxa, two of which appear to consist exclusively of both triploid and tetraploid individuals. While pollen fertility is reduced in triploids, both ploidy levels are characterized by production of eight nucleate aposporous embryo-...

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Veröffentlicht in:	American journal of botany 1986-01, Vol.73 (1), p.116-130
Hauptverfasser:	Dickinson, T.A, Phipps, J.B
Format:	Artikel
Sprache:	eng
Schlagworte:	Apomixis Biological and medical sciences COMPATIBILITY CRATAEGUS Diploidy FERTILIDAD FERTILITE FERTILITY Fruits Fundamental and applied biological sciences. Psychology Inflorescences ONTARIO Ovules Plant cytology, morphology, systematics, chorology and evolution POLIPLOIDIA Pollen Pollination POLYPLOIDIE POLYPLOIDY PRODUCCION DE SEMILLAS PRODUCTION DE SEMENCES REPRODUCCION REPRODUCTION SEED PRODUCTION Spermatophyta Systematics (diagnosis, chromosome numbers) Taxa TETRAPLOIDE TETRAPLOIDS Tetraploidy topodemes TRIPLOIDE TRIPLOIDS Triploidy
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