About flowering biology of alien species: 3. Caragana arborescens Lam. and C. laeta Kom.
Some data on flowering biology of a potentially aggressive alien species - Caragana arborescens - are presented. Micromorphological characters of flowers at different stages of development for typical plants and two cultivars (C. arborescens f. pendula and C. arborescens f. lorbergii) and also for the Central Asian C. laeta are described. The pollen fertility is defined. A number of features in which C. arborescens has a competitive superiority over closely related taxa are revealed. Arguments for C. arborescens f. lorbergii allocation as a particular taxon are adduced.