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We construct the BPS quivers with superpotential for the 4d N=2 gaugetheories with non-simply laced Lie groups (B_n, C_n, F_4 and G_2). Theconstruction is inspired by the BIKMSV geometric engineering of these gaugegroups as non-split singular elliptic fibrations. From the categoricalviewpoint of arXiv:1203.6743, the fibration of the light category L(g) over the(degenerate) Gaiotto curve has a monodromy given by the action of the outerautomorphism of the corresponding unfolded Lie algebra. In view of theKatz--Vafa `matter from geometry' mechanism, the monodromic idea may beextended to the construction of (Q, W) for SYM coupled to higher matterrepresentations. This is done through a construction we call specialization.

4d N=2 Gauge Theories and Quivers: the Non-Simply Laced Case