xx Phyteuma ovatum Honck. [ Phyteuma halleri All.]
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xx Phyteuma ovatum Honck. [Campanulaceae]
H.G.L. Reichenbach, Icon. Fl. Germ. Helv., vol. 19(1): (Die Cichoriaceen, Ambrosiaceen, Campanulaceen, Lobeliaceen dazu die Cucurbitaceen der deutschen Flora ): t. 1584, fig. 2 (1860) [H.G. Reichenbach]