What makes it that if two species crossbreed, the baby is infertile? What makes it possible for the parents to mate in the first place?
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While its hard to guess the relevant species motivating the question I can confirm that palm trees (the only subfamily I know much about), can pretty easily breed between two species and they very often produce hybrids which are very fertile. In many cases plant farms collect species that became geographically separated and distinct which then cross pollinate and produce a wide range of wacky hybrids that are fruit-producing and eager to hybridize and reproduce. Some of the seeds produce solitary trees, others produce clustering specimens. There isn’t anything inherit about hybridization that makes for an infertile seed. That condition may occur in some cases but it certainly isn’t true of all.
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