This section is from the book "Handbook Of Hardy Trees, Shrubs, And Herbaceous Plants", by W. Botting Hemsley. Also available from Amazon: Handbook of hardy trees, shrubs, and herbaceous plants.
Twining shrubs with opposite glabrous leaves and axillary cymose flowers. Corolla rotate, having 5 awned scales in the throat; lobes spreading. Filaments not combined. Pollen-masses granular, applied separately to the stigma. A small genus, occurring in the South of Europe and tropical Asia and Africa. The name is derived from a coiling round, in reference to the habit of some species.
1. P. Grceca. - A deciduous twiner with rather small ovate-lanceolate leaves and purple-brown axillary clusters of flowers, appearing in Summer. A very curious and interesting plant, growing from 15 to 20 feet high. Native of Southern Europe.
Physianthus albicans is a showy white-flowered tender climber from South America, occasionally seen in sheltered localities.