Old texts: Hayne's Darstellung und Beschreibung, 2te Auflage, vol. 1, 1853: the images.

Old texts: Hayne's Getreue Darstellung, vol. 1, 1805: the images.

Classic texts: Hill 1812: The Images.

Flowering top. Brussels bot.g., Belgium. Greenhouse. 2008-06-05.

Flower clusters. Brussels bot.g., Belgium. Greenhouse. 2008-06-05.

Flowering plant. Brussels bot.g., Belgium. Greenhouse. 2008-06-05.

Flowers. Gothenburg bot.g., Sweden. Planted. 2007-07-12.

Flowering plants. Gothenburg bot.g., Sweden. Planted. 2007-07-12.

Flowering plant. Kyoto bot.g, Japan. Planted. 2001-05-10.

Flowering plants. Kyoto bot.g, Japan. Planted. 2001-05-10.

Closeup of flower. Kyoto bot.g, Japan. Planted. 2001-05-10.

Classic texts: WaldFeld 1947: Die Bilder.