Rudbeckia laciniata

4. Rudbeckia laciniata L. (N-Am.) – A rare, locally naturalised escape from cultivation. The naturalisation history of Rudbeckia laciniata in Belgium is rather well-documented. It was apparently first collected in 1844 along river Kleine Nete between Lier and Emblem. At that time Rudbeckia laciniata was already very common and obviously naturalised since quite some time (since ca. 1700 according to some sources; Verloove 2002). In the valley of river Grote Nete furthermore recorded near Meerhout (at least since ca. 1850). Also observed in several widely scattered locations in Belgium but usually rather ephemeral. A larger, established population was recently detected at the Zuid-Willemsvaart in Bree. Rudbeckia laciniata is naturalised in damp, nitrophilous meadows and ditches. In the surroundings of Lier it often grows along with non-native Veronica longifolia.

Plants in cultivation in Europe (at least in part) obviously differ from native American ones, especially in that the receptacle finaly becomes narrowly conical. In genuine Rudbeckia laciniata the receptacle is hemispheric or ovoid to globose (Urbatsch & Cox 2006). European plants probably represent cultivars or hybrids of unknown parentage or origin and probably not the genuine species.

Rudbeckia laciniata, Laarne, Damvallei, ditch, August 2011, W. Vercruysse Rudbeckia laciniata, Laarne, Damvallei, ditch, August 2011, W. Vercruysse
   

 


Selected literature:

Adolphi K. (1995) Neophytische Kultur- und Anbaupflanzen als Kulturflüchtlinge des Rheinlandes. Nardus 2: 272 p.

Feder J. (2010) Schlitzblättriger Sonnenhut Rudbeckia laciniata L. - längst eingebürgert. Bremer Botanische Briefe 7: 5-7.

Jalas J. (1993) Problems concerning Rudbeckia laciniata (Asteraceae) in Europe. Fragm. Flor. Geobot., Suppl. 2: 289-297.

Urbatsch L.E. & Cox P.B. (2006) Rudbeckia. In: Flora of North America Editorial Committee (eds.), Flora of North America, vol. 21. Oxford University Press, New York-Oxford: 44-60.

Verloove F. (2002) Ingeburgerde plantensoorten in Vlaanderen. Mededeling van het Instituut voor Natuurbehoud n° 20: 227 p.

Verloove F. (2006) Rudbeckia laciniata. In: Van Landuyt W., Hoste I., Vanhecke L., Van den Bremt P., Vercruysse W. & De Beer D., Atlas van de flora van Vlaanderen en het Brussels gewest. Instituut voor Natuur- en Bosonderzoek, Nationale Plantentuin van België en Flo.Wer: 771.

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith