Data associated with the Columelliaceae (whose exact systematic position has been problematic) may suggest that it is the remains of part of that archaic web of taxa that once linked the early Gentianales (and possibly Scrophulariales) to its Cornalian-like ancestor.
The Buddlejaceae and Retziaceae also form bridging taxa between the Scrophulariales and Gentianales, in particular with the family Loganiaceae (and possibly also the Solanales).
Note the isolated position of the Menyanthaceae, confirming its exclusion from the Gentianales and possibly the Solanales and Scrophulariales as well.
Tribe Buddlejeae (= Family Buddlejaceae): The overall consensus is that this tribe should be given family status, the Buddlejaceae, and that its true affinities are with the Scrophulariales and not the Gentianales (Airy Shaw, 1985; Cronquist, 1988; Dahlgren, 1983; Takhtajan, 1983; Wagenitz, 1977).
(1979; Dahlgren, 1983) suggested an association with the Stilbaceae in his order Scrophulariales. Thorne at first gave this taxon subfamily status under the Loganiaceae (1983); then, in 1992, following Dahlgren and co-workers' line of thought, he transferred this subfamily to the family Stilbaceae in his Bignoniales.