The Collaborative International Dictionary of English v.0.48:

Lupinine \Lu"pin*ine\, n. (Chem.)
   An alkaloid found in several species of lupine (Lupinus
   luteus, Lupinus albus, etc.), and extracted as a bitter
   crystalline substance, having a formula C10H19NO. Called
   also l-lupinine
   [1913 Webster]

   Note: Chemically it is a a bicyclic saturated quinolizine
         [1-R-trans]-Octahydro-2H-quinolizine-1-methanol, with
         the structure:
         CH2OH | /\ H /\ / \|/ \ | | | | N | \ / \ / \/ \/
         --[MI11]
         [PJC]

WordNet (r) 3.0 (2006):

Lupinus luteus
    n 1: yellow-flowered European lupine cultivated for forage [syn:
         yellow lupine, Lupinus luteus]