Where does "acutilobate" originate from?

Acutilobate:

Latin acutus (“sharp”) + lobe

(botany) Having acute lobes, as some leaves.

The word very likely comes from the Latin acutilobus:

Having pointed stems

Used almost exclusively as a taxonomic epithet.

Searching for "acutilobus" in Wikipedia yields:

• Orectochilus Acutilobus, a beetle
• Amaranthus acutilobus, a species of amaranth
• Myxopappus acutilobus, a member of the daisy family
• Ranunculus acutilobus, some sort of buttercup

As an adjective, acutilobate could well have been/still be used to describe such plants. Or perhaps it has since been superseded by some other term which has attracted the fancy of botanists worldwide. In any case, that does not mean that the word should no longer be in the dictionary. Some words survive. Some don't. This one very likely didn't, unlike its second cousin twice removed, acutilingual—meaning "having a sharply pointed tongue or mouth, as certain bees"—which has found a curious niche to survive in.