Kohler's Medizinal-Pflanzen in naturgetreuen Abbildungen mit kurz erlauterndem Texte :.Gera-Untermhaus :Fr. Eugen Kohler,[1883-1914].biodiversitylibrary.org/page/303578
2010-11-06 Lower Austria, district Mistelbach (Mittleres Bodendorf/ Weisses Kreuz, 210 m AMSL).In the background vineyards can be seen; the field of rapeseed is the green one in the centre, with some yellow flowers just visible: which means that it never will fruit.Here, Brassica napus napus is used as green manure, and also to fight erosion in the hilly country of Weinviertel; come spring, those plants will be taken under by ploughing.German name: Raps