Reichenbach, H.G.L., Icones florae Germanicae et Helveticae (Deutschlands Flora), German ed. with partly coloured plates (1837-1912)
Icon. Fl. Germ. Helv.

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vol. 17 (1855)

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[Die Gentianaceen, Apocynaceen, Asclepiadeen, Oleaceen, Styracaeen, Ebenaceen, Aquifoliaceen, Primulaceen, Plumbagineen, Bicornes, Caprifoliaceen, Rubiaceen der deutschen Flora]

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t. 1051 f. 2

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