Ranunculus rhomboideus Goldie
Ranunculus rhomboideus is a perennial with lemon yellow flowers.
Ranunculus rhomboideus was described by John Goldie. The name is considered as validly published.
Ranunculus rhomboideus 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 perennials reach heights of 5 to 22 centimetres.
Ranunculus rhomboideus is deciduous. The mid-green, simple leaves are basal. They are ovate, crenate and petiolate.
Flowers and Fruits
Ranunculus rhomboideus produces panicles of yellow five-stellate flowers from April to June.
The perennials produce nutlets.
Ranunculus rhomboideus is native to eastern Canada, Manitoba, Montana, North Dakota, South Dakota, Nebraska and the central Northeast of the US.
The perennials prefer a sunny to half-shady situation on moderately moist soil. The substrate should be sandy-loamy or gritty-loamy soil.
Maintenance and Propagation
Propagate by sowing just before seeds ripen. Germination may take some time.
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.