The Collaborative International Dictionary of English v.0.48:

Gelsemine \Gel"se*mine\, n. (Chem.)
   An alkaloid obtained from the yellow jasmine (Gelsemium
   sempervirens), as a bitter white semicrystalline substance;
   -- called also gelsemia.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Gelseminic \Gel`se*min"ic\, n. (Chem.)
   Pertaining to, or derived from, the yellow jasmine
   (Gelsemium sempervirens); as, gelseminic acid, a white
   crystalline substance resembling esculin.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Gelsemium \Gel*se"mium\, n. [NL., fr. It. gelsomino jasmine.]
   1. (Bot.) A genus of climbing plants. The yellow (false)
      jasmine (Gelsemium sempervirens) is a native of the
      Southern United States. It has showy and deliciously
      fragrant flowers.
      [1913 Webster]

   2. (Med.) The root of the yellow jasmine, used in malarial
      fevers, etc.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Gelsemium sempervirens
    n 1: poisonous woody evergreen vine of southeastern United
         States having fragrant yellow funnel-shaped flowers [syn:
         yellow jasmine, yellow jessamine, Carolina jasmine,
         evening trumpet flower, Gelsemium sempervirens]