Ranunculus rionii Lagger
Ranunculus rionii is a annual aquatic plant.
Ranunculus rionii was described by Franz Joseph Lagger in 1848. The name is considered as validly published.
Ranunculus rionii is a species in the genus Ranunculus which contains approximately 432 to 2271 species and belongs to the family of the Ranunculaceae (Buttercup Family). The type species of the genus is Ranunculus auricomus.
The plants reach heights of 60 to 100 centimetres.
Ranunculus rionii is deciduous. The tripinnate leaves are alternate. The linear leaflets are entire and petiolate.
Flowers and Fruits
Ranunculus rionii produces cymes of white five-stellate flowers from June to August.
The plants produce nutlets.
Ranunculus rionii is native to France, Central Europe, eastern Central Europe, the Balkan Peninsula, Eastern Europe, Turkey, the Eastern Mediterranean, the Caucasus, Iran, West-Siberia, Central Asia, the Himalaya, West China, western North America and South Africa, Lesotho and Swaziland.
The plants are aquatic plants and prefer a sunny situation. The substrate should be loamy or loamy clay soil. The plants are suited for and .
Maintenance and Propagation
The sap may irritate the skin
Please read the health issues note!
Pests and Diseases
Honeydew, galls and distorted leaves are a sign for an infestation with aphids. Use an insecticide or control biologically , e.g. with parasitic wasps or predators such as Aphidoletes aphidimyza.
A powdery white coat on the plants indicates an infection with powdery mildew. Remove affected plants and apply a fungicide. To prevent infection improve ventilation, keep the roots moist and do not water the plants from above.
Gnaw marks and slime trails indicate a problem with slugs. Prevent infestation by improving hygiene and by regularly working the soil. In case of an infestation use slug pellets or nematodes to control pest. Handpicking the slug also helps, do this preferably in the evening hours.
- Walter Erhardt, Erich GÃ¶tz, Nils BÃ¶deker, Siegmund Seybold: Der groÃe Zander. Eugen Ulmer KG, Stuttgart 2008, ISBN 978-3-8001-5406-7. (Ger.)
- Christoper Brickell (Editor-in-chief): RHS A-Z Encyclopedia of Garden Plants. Third edition. Dorling Kindersley, London 2003, ISBN 0-7513-3738-2.