X. borealis is a beautiful species, I have seen them for sale at Nasco too. You asked a good question. There have been only 4 cases of interspecific hybrids that have occurred naturally:
- X. laevis and X. gilli
- X. muelleri and X. laevis
- X. borealis and X. victorianus
- X. fraseri and X. tropicalis
Since X. victorianus is similar to X. laevis, I think a hybrid between X. laevis and X. borealis is quite possible.





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