I am not familiar with either of them. There is a detailed description of Crataegus x sinaica in Vicflora https://vicflora.rbg.vic.gov.au/flora/taxon/83c93f37-5402-4e8d-8942-5f0dd1647159 If that helps.
Mike twelve species of Hawthorn were grown at Yarralumla Nursery between 1915 and 1980. Crataegus laevigata was the most popular planting followed by C. phaenopyrum, C. monogyna and C. crus-galli. I have cut out Crus-galli from Red Hill, while C. monogyna is a widespread weed. Of the twelve only C. monogyna and C. azarolus look like the plant in your photo, with C. azarolus being the most likely, though a form of C. monogyna can't be totally dismissed.
Describe how you intend to use these images and/or audio files and your request will be sent to the author for consideration.
Your request has been successfully submitted to the author for consideration.
1,900,056 sightings of 21,137 species in 9,345 locations from 12,987 contributors CCA 3.0 | privacy
We acknowledge the Traditional Owners of this land and acknowledge their continuing connection to their culture. We pay our respects to their Elders past and present.