Crataegus is not a valid species
Did you mean one of the species from the following list?
Crataegus coccinea - 1 collection objects
Crataegus cordata - 1 collection objects
Crataegus curvisepala - 1 collection objects
Crataegus mexicana - 1 collection objects
Crataegus monogyna - 2 collection objects
Crataegus rhipidophylla - 3 collection objects