The Collaborative International Dictionary of English v.0.48:

flameflower \flameflower\, flame flower \flame flower\n.
   1. a plant of the genus Kniphofia having long grasslike
      leaves and tall scapes of red or yellow drooping flowers.

   Syn: kniphofia, tritoma.
        [WordNet 1.5]

   2. plant of the Southwestern U. S. with fleshy roots and
      erect stems with narrow succulent leaves and one
      reddish-orange flower in each upper leaf axil. Its fleshy
      roots were once cooked by Indians.
      [WordNet 1.5]

WordNet (r) 3.0 (2006):

flame flower
    n 1: a plant of the genus Kniphofia having long grasslike leaves
         and tall scapes of red or yellow drooping flowers [syn:
         kniphofia, tritoma, flame flower, flame-flower,
         flameflower]
    2: plant with fleshy roots and erect stems with narrow succulent
       leaves and one reddish-orange flower in each upper leaf axil;
       southwestern United States; Indians once cooked the fleshy
       roots [syn: flame flower, flame-flower, flameflower,
       Talinum aurantiacum]