In article , Nick Maclaren
writes

Pyrcantha is a very close relative of hawthorn,

Isn't 'very close' stretching it a bit? Agreed they're in the same sub-
family of Rosaceae, but that subfamily also includes amelanchier, apple,
pear, cotoneaster and Photinia

.... or has the taxonomy moved on a bit since then?

--
Kay
"Do not insult the crocodile until you have crossed the river"