Oenothera biennis (s. str.) (4800' N 1635' E)

Description:

2011-07-29 Lower Austria, district Bruck/Leitha - alluvial forest dominated by Salix alba (168 msm Quadrant 7965/3).German name: Gewhnliche Nachtkerze (ieS)Compare also other shots of the same specimen, linked below.ID: Fischer & al., Exkursionsflora (2008 3rd); for this one distinctive is:- base of hair is green (it shows red dot for many other species);- top buds remain upright even shortly before they begin to flower;- central nerve of leaves is predominantly red.This is one of the most common Oenothera species which was introduced (it is native to Northern America); in the process of taking over natural habitats several new ('European') species emerged through hybridisation and genetic stabilisation of the new features.