Hi Andrew, I have been following the discussion with interest and have just remembered and article in Herbertia 58 ,2003-2004, Hieronymiellla , A Little Known Genus From Argentina and Bolivia by Silvia C. Arroyo- Leuenberger and Beat Ernst Leuenberger. Your web image is quite similar to H marginata photographed in Puna- habitat in Jujay in the article. H argentina is reduced to a synonym of H marginata. Rob in Tasmania http://web.me.com/roberth6/Amaryllid_Obsession/