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Updated: July 28, 2025
The tendril-bearing Bignonia Tweedyana emits roots, which curve half round and adhere to thin sticks. I have not closely observed many root-climbers, but can give one curious fact.
H. M. July 7, 1st circle was made in 6 18 8, 2nd 6 53 9, 3rd 6 30 As long as a plant remains under the same conditions, the rate is often remarkably uniform, as with the Hop, Mikania, Phaseolus, &c. The Scyphanthus made one revolution in 1 hr. 17 m., and this is the quickest rate observed by me; but we shall hereafter see a tendril-bearing Passiflora revolving more rapidly.
It may be added, as serving to sum up the foregoing views on the origin of tendril-bearing plants, that L. nissolia is probably descended from a plant which was primordially a twiner; this then became a leaf-climber, the leaves being afterwards converted by degrees into tendrils, with the stipules greatly increased in size through the law of compensation.
The internodes, however, of Passiflora gracilis have the power in a perfect manner, and those of the common Vine in an imperfect degree: so that at least a trace of the supposed primordial habit has been retained by some members of all the larger tendril-bearing groups.
But the whole subject of the spiral contraction of tendrils will be discussed after all the tendril-bearing species have been described. Bignonia littoralis. The young internodes revolve in large ellipses. An internode bearing immature tendrils made two revolutions, each in 3 hrs. 50 m.; but when grown older with the tendrils mature, it made two ellipses, each at the rate of 2 hrs. 44 m.
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