Erysimum helveticum, Taxa Only, Exact Match: 2 Treatments

Erysimum helveticum			Hess, Hans Ernst, Landolt, Elias & Hirzel, Rosmarie, 1976, Flora der Schweiz und angrenzender Gebiete. Band 2. Nymphaceae bis Primulaceae (2 nd edition) (p. 956): Cruciferae, Birkhaeuser Verlag : 245	245
Erysimum helveticum			Jarvis, Charlie, 2007, Chapter 7: Linnaean Plant Names and their Types (part C), Order out of Chaos. Linnaean Plant Types and their Types, London: Linnaean Society of London in association with the Natural History Museum, pp. 370-473 : 408	408