grammopetalousadj.

/ˌɡraməʊˈpɛtələs/Etymology: < grammo-, irregular combining form of Greek γραμμή line + πέταλον leaf + -ous suffix.
Botany.
1847 in J. Craig ; and in later Dicts.
This entry has not yet been fully updated (first published 1900; most recently modified version published online September 2018).