Holstein, N., J.  Chacón, A.  Otero, P.  Jiménez-Mejías, and M.  Weigend. 2016. ?Towards a monophyletic Omphalodes?or an expansion of North American Mimophytum?. PhytotaxaPhytotaxa 288:131?144.

Holstein, N., and M.  Weigend. 2016. ?Lectotypifications and nomenclatural notes in the Boraginaceae s.str. for the Flora of Ecuador?. Phytotaxa 278(1):73. Retrieved  (http://biotaxa.org/Phytotaxa/article/view/phytotaxa.278.1.9).

Holstein, N., J.  Chacón, H. H.  Hilger, and M.  Weigend. 2016. ?No longer shipwrecked?Selkirkia (Boraginaceae) back on the mainland with generic rearrangements in South American ?Omphalodes? based on molecular data?. PhytotaxaPhytotaxa 270:231?251.

Holstein, N., and M.  Weigend. 2015. ?(2388) Proposal to reject the name Myosotis collina (Boraginaceae)?. Taxon 64(5):1058?1059.