Thank you for the Aristolochia and Viscum cases: what species were they?
"More Letters of Charles Darwin" by Charles Darwin
This occurs in many species of Arum and Aristolochia.
"Darwinism (1889)" by Alfred Russel Wallace
At 7,800 feet, Aristolochia novum genus, Tritium glaucum, Thlaspi, Arabis cordata, Loranthus, Symplocos sessiliflora.
"Journals of Travels in Assam, Burma, Bhootan, Afghanistan and TheNeighbouring Countries" by William Griffith
Aristolochia, or Dutchman's Pipe, is a hardy vine of more than ordinary merit.
"Amateur Gardencraft" by Eben E. Rexford
Serpentaria virginiana, aristolochia serpentaria, guaiacum.
"Zoonomia, Vol. II" by Erasmus Darwin
The tubular flowers of Aristolochia offer a very similar case.
"The Beauties of Nature" by Sir John Lubbock
ARISTOLOCHIA, or DUTCHMAN'S PIPE.
"The Practical Garden-Book" by C. E. Hunn