Title: Taxonomy and morphology of Thalictrum (Ranunculaceae) in New Guinea
Abstract: Summary The genus Thalictrum L. in New Guinea is revised based on morphological evidence. Full descriptions of the genus and the four taxa recognised are given. Two species are recognised: Thalictrum papuanum , widespread across New Guinea, and a new species described here; T. umbraticola , endemic to west New Guinea. Two new varieties are described: Thalictrum papuanum var. acutisegmentum and T. papuanum var. laticarpellum. One new synonym of Thalictrum papuanum var. papuanum is established: T. papuanum var. oranjense . Keys to the taxa and distribution maps, as well as preliminary conservation assessments, are provided.