Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
undĕ-cumque (undĕ-cunque; in tmesi: unde vacefit cumque locus, Lucr. 6, 1017), adv., from wherever, whencesoever, from what place or part soever (post-Aug.): undecumque moti sunt (fluctus), Sen. Vit. Beat. 27, 3: fluens sanguis, Plin. 27, 4, 5, § 18; cf.: nec undecumque causa fluxit, ibi culpa est, Quint. 7, 3, 33: undecumque inceperis, ubicumque desieris, Plin. Ep. 9, 4, 2: ignes transsiliunt protinus in naphtham undecumque visam, Plin. 2, 105, 109, § 235; Treb. Pol. Trig. Tyr. 22, 4.
With gentium: undecumque gentium venissent, Vop. Firm. 14.