Note 3 — Chapter VIII · MODIFIED CIRCUMNUTATION: MOVEMENTS EXCITED BY LIGHT.
Reading edition
The peduncles of several other species of Cyclamen twist themselves into a spire, and according to Erasmus Darwin (‘Botanic Garden,’ Canto., iii. p. 126), the pods forcibly penetrate the earth. See also Grenier and Godron, ‘Flore de France,’ tom. ii. p. 459.