[3.P] The Summoner's Handbook: A Guide to the Pathfinder Summoner

[Morien]

Curious and Deuxhero (and for everyone else),

Again, that is what share spell is for. The spell would not normally be able to effect the Eidolon? Well, it can now, because your class feature says so. Point out to him that Enlarge Person is practically the only spell in the entire Summoner spell list that doesn't work on the Eidolon without that class feature, so why would it be there otherwise?

Found this in Bestiary, page 308, Paizo's definition:

Humanoid:
A humanoid usually has two arms, two legs, and one head, or a human-like torso, arms, and a head.

Since I have a head, and 2 arms, and have declared it to be similar to a Lillend, I think I am covered. And that means I should be able to cast it on my Eidolon.

Thanks to all.
Morien