Notes on the taxonomy and parasitism of <i>Christisonia tubulosa</i> (Orobanchaceae)

This paper deals with the taxonomy and parasitism of the endemic species Christisonia tubulosa (Wight) Hook.f.; specifically, the documentation of morphological variations and recognition of C. keralensis Erady in its synonymy, lectotypification of the basionym Oligopholis tubulosa Wight, and report of first‐hand observations of iparasitism on Ruellia L. (Acanthaceae), Impatiens L. (Balsaminaceae), and Mikania Willd. (Asteraceae).