The Collaborative International Dictionary of English v.0.48:

endogamic \endogamic\ adj.
   1. fertilized by pollen from another flower of the same
      plant.
      [WordNet 1.5]

   2. of marriage within a class or tribe as required by custom
      or law; same as endogamous.

   Syn: endogamous, within-group.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

endogamic
    adj 1: characterized by or fit for fertilization by pollen from
           another flower of the same kind [syn: endogamous,
           endogamic] [ant: autogamic, autogamous, exogamic,
           exogamous]
    2: pertaining to or characterized by the custom of marrying only
       within the limits of a clan or tribe [syn: endogamous,
       endogamic] [ant: exogamic, exogamous]