2010-05-14 Lower Austria, district Bruck/Leitha (Steingschirr, 185 m AMSL).Flowering.Growing here on dry, nutrient-poor soil, which it is enrichening with nitrogen - thus, changing it to nutrient-rich, which over time will wreck the whole habitat (this one here) where very rare Stipa pulcherrima is growing.Robinia pseudoacacia (Robinie)
2010.05.03 Austria, Vienna XI. district/ Lower Austria, district Schwechat (brownlands near rail hub, 168 m AMSL).Leaves: they're late to grow, and you can still see the fruit of last year (pods, as you can see).Very common, invasive.In the background Yucca filamentosa (?!) - for ID of this one see comments here.German name: Robinie
2008.06.10: Austria, Lower Austria, district Schwechat/WU, 177 m AMSL, planted in an avenue: stem of very old tree.Flowering in may/june.Common, invasive.German names: Gewhnlich-Robinie, Scheinakazie, Falsche Akazie.
2008.06.23: Austria, Vienna XXII. district, 152 m AMSL, heath (Lobau Heisslnde): bark 'ringed'.This is a method to effectively kill them (and the reason for doing so is that they enrichen soil with nitrogen which changes the soil forever - as they grow on nutrient poor soil which is home to many endangered species which dislike rich soil).R. pseudoacacia, when 'ringend', still tries to support its branches and leaves till the whole tree dies off, roots included. (With some other species this however does not work, as is the case for Alianthus altissima, another introduced and invasive species equally endangering heaths.)Trees which are felled though grow new shoots from their roots: so felling is not an option to preserve this heath biotope.Flowering in may/june.Common, invasive.German names: Gewhnlich-Robinie, Scheinakazie, Falsche Akazie.For ringing method cf. AGES
2008-05-23 Lower Austria, district Gnserndorf (Lobau bush heath - Busch-Heisslnde, 150 AMSL).The dead trees are Populus alba; to the right there's also Robinia pseudoacacia to be seen (flowering).This is a typical bush heath habitat of Lobau - dry and nutrient-poor soil on elevated rubble terraces which are usually only flooded rarely (every 10 years or so, or even less frequent; this place however has been flooded in 2002, 2009 and 2010).
2010-05-14 Lower Austria, district Bruck/Leitha (Steingschirr, 185 m AMSL).Background: Robinia pseudoacacia, a non-native and invasive species - here endangering the Stipa habitat (as Robinia enriches soil with nitrogen, which in turn makes it too nutrient-rich for plants like Stipa which do not grow in nutrient-rich habitats).German name: Gross-Federgras