Would hybridization occur naturally? (native & non-native; e/w)
I'm interested learning which groups of fruits & nuts would/would not naturally hybridize - perhaps due to synchronicity/non-synchronicity of flowering; also to know when hybridization occurs, is the seed of the resulting hybrid viable or non-viable.
1. Native X European Plums?
2. Native X European currants/gooseberries?
3. Native X European Cherries?
4. Native X Asian Persimmon (flowers may sometimes align, I've observed; maybe hybrids like 'Rosseyanka', etc. are not able to produce viable seed; but I doubt that since I think there exist hybrids that were subsequently crossed once again back to one of either parents - such as 'Prok'/'Korp'
5. Native X European Mountain-Ash
Again, do these types flower coincidentally and is the seed that is produced viable in each case? Of course, many pairings do (Native X Asian Mulberry, etc....)
Secondly, would a test field of say multiple US Native Vaccinium spp. (blueberry, huckleberry, deerberry, bilberry types) hybridize?
Vaccinium cespitosum - Bilberry, Dwarf
Vaccinium myrtillus - Whortleberry; Bilberry, Common
Vaccinium ovatum - Huckleberry, California/Evergreen
Vaccinium augustifolia - Blueberry, Low-bush
Vaccinium corymbosum - Blueberry, Northern High-bush
Vaccinium (?spp.) - Blueberry, Southern High-bush
Vaccinium stamineum - Deerberry
Vaccinium uliginosum L. - Blueberry, Mountain/Bog
Gaylussacia baccata Huckleberry, Black/Dwarf/Box