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Originally Posted by felihaha  Can P.amabilis and P.aphrodite be crossed to produce healthy fertile offspring? |
Yes they can, and they have been. Phal Bataan (amabilis x aphrodite) was registered in 1943.
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Originally Posted by felihaha Up to current, these 2 are treated as different species and according to biological species concept, species that are treated differently are unable to cross and produce viable offspring. |
That's not correct, at least not in the orchid family. Species belonging to the same genus can all be crossed with one another and species belonging to the same Alliance can be crossed successfully even though they may not be members of the same genus.