Turns out it is! Guess it's to do with Lunar & not a fleshy fern.
Now I want to know what a lunate segment looks like!
Lunary
Lu"na*ry\, a. [Cf. F. lunaire. See Lunar.] Lunar. [Obs.] --Fuller. Lunary
Lu"na*ry\, n. [Cf. F. lunaire.] (Bot.) (a) The herb moonwort or "honesty". (b) A low fleshy fern (Botrychium Lunaria) with lunate segments of the leaf or frond.
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