The Collaborative International Dictionary of English v.0.48:

Jacobaean lily \Jac`o*b[ae]"an lil"y\ [See Jacobean.] (Bot.)
   A bulbous plant (Amaryllis formosissima syn. Sprekelia
   formosissima) from Mexico. It bears a single, large, deep,
   red, lilylike flower. [Written also Jacobean.] Jacobean