Crataegus fontanesiana explained

J.B. Phipps has shown^[1] that Crataegus fontanesiana are "somewhat narrow-leaved forms of C. calpodendron". The name was mis-applied for much of the 19th and 20th centuries to some forms of C. crus-galli.

Notes and References

1. Phipps . J.B. . 1987 . What is Crataegus fontanesiana (Spach) Steud.? (Rosaceae) . Taxon . 36 . 3 . 641–4 . 10.2307/1221862 . 1221862 .