Max, it can sometimes take a long while to describe a species. Often there is only a single plant discovered at first and herbarim material may be insufficient for a proper description and to lodge in herbariums. I understand a male flower is important if one can be found. Then the author must do extensive research to ensure the plant has not already been described as something else. This often entails visits to herbariums, then the description has to be written and often a line drawing done. Then it has to be actually published and publications sometimes are backlogged for a long time. Finally, to get all this done. the discoverer has to be suffficiently motivated and have the time to go through the process.
Joachim, I got a shock in that the photo I posted seems to taken from that Japanaese website. It's been circulating for a while and was sent to me as an e-mail attachment. I hope the owener's permission was obtained for it's general use. I'll try and check. That N. edwardisiana is nice!
Joe, N. glandulifera looks a little like N. stenophylla, at least when juvenile, but the stem, petioles and underside of the leaves are covered in little black dots. When Ch'ien Lee discovered this species he at first thought the plants had a fungal problem but it turned out that the black dots are nectar glands. Sorry, I don't have a photo of this species.