Original paper

A revision of the Nasa stuebeliana group Nasa Weigend ser. Saccatae (Urb. & Gilg) Weigend p.p., Loasaceae with notes on morphology, ecology, and distribution

Weigend, Maximilian; Rodriguez, Eric; Rodriguez,


The Nasa stuebeliana group belonging to Nasa Weigend ser. Saccatae (Urb. & Gilg) Weigend (Loasaceae) is a group of 8 species, five of which are here described as new to science: N. kuelapensis, N. formosissima, N. contumazensis, N. otuzcensis and N. moroensis. The group has its centre of diversity in the Amotape-Huancabamba zone in northern Peru, where four of the newly described species come from. They are narrowly endemic and mostly restricted to Andean scrub vegetation at intermediate altitudes (2000-3000 m). The N. stuebeliana group belongs to paraphyletic Nasa ser. Saccatae (Urb. & Gilg) Weigend and is characterized by the frequent occurrence of amplexicaul bracts and pseudostipules and usually strongly folded seed testa in combination with the typical N. ser. Saccatae floral morphology (brightly coloured nectar scales, petals mostly white, membranaceous and spreading, annual habit). The floral morphology and anatomy and the trichome cover are illustrated and discussed. A key to all taxa recognized and descriptions, specimen citations and illustrations are given.