Classic texts: Madaus 1938: the pics.

Classic texts: Madaus 1938: the pics.

Vine. Botanical garden Kumpula, Helsinki, Finland. Planted. 2010-06-14.

Vine. Botanical garden Kumpula, Helsinki, Finland. Planted. 2010-06-14.

Young shoot. Botanical garden Kumpula, Helsinki, Finland. Planted. 2010-06-14.

Classic texts: Woodville 1790-1794: The images.

Classic texts: Woodville 1790-1794: The images.

Classic texts: Woodville 1790-1794: The images.

Classic texts: Woodville 1790-1794: The images.

Old texts: Hayne's Getreue Darstellung, vol. 9, 1825: the images.

Old texts: Hayne's Getreue Darstellung, vol. 9, 1825: the images.

Old texts: Hayne's Getreue Darstellung, vol. 9, 1825: the images.

Old texts: Hayne's Getreue Darstellung, vol. 9, 1825: the images.

Old texts: Hayne's Getreue Darstellung, vol. 9, 1825: the images.

Classic texts: Rafinesque 1828: the pics.

Classic texts: W. Barton, 1818: The pics.

Classic texts: Bigelow 1817-1821: The images.

Climber. Kyoto bot.g, Japan. Planted. 2001-05-10.

Flower. Kyoto bot.g, Japan. Planted. 2001-05-10.

Climber. Kyoto bot.g, Japan. Planted. 2001-05-10.

Flowering stand. London, UK. Planted. 1997-07-01.

Closeup of flowers. London, UK. Planted. 1997-07-01.

Flowers. Marburg bot.g., Germany. Greenhouse. 2006-10-02.

Plant with seedpods. AZ, US. Wild. 1998-05-01.

Red-leafed plant. Chiricahuas, AZ, US. Wild. 1998-04-01.

Flower and leaf. Copenhagen bot.g., Denmark. Planted. 2005-06-05.

Branch in flower. Copenhagen bot.g., Denmark. Planted. 2005-06-05.

Branch in flower. Copenhagen bot.g., Denmark. Planted. 2005-06-05.

Classic texts: Harding 1936: the pics.

Classic texts: King's 1898: The Images.