Download e-book for kindle: On the Movements and Habits of Climbing Plants by Charles Darwin

By Charles Darwin

ISBN-10: 0511703015

ISBN-13: 9780511703010

ISBN-10: 1108003591

ISBN-13: 9781108003599

At first released via the Linnean Society, this 1865 essay was once Darwin's first foray into the examine of hiking crops. He was once encouraged to provide this paintings via a paper at the tendrilled Cucurbitacean plant by means of American botanist Asa grey, with whom he had an organization highbrow friendship. Darwin examines intimately these crops which climb utilizing a twisting stem, equivalent to the hop; leaf-climbers, akin to the clematis; tendrilled vegetation corresponding to the fervour flower; and hook and root climbers equivalent to ivy. The conclusions reached by way of his examine are offered when it comes to the variations of varied species to their environments, a continuation of the theories that Darwin had propounded in his at the beginning of the Species six years prior. His ardour for the layout of the vegetation and fascination with the range in their powers of flow are transparent during this available instance of the method of evolution.

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Extra resources for On the Movements and Habits of Climbing Plants

Example text

35 m. The two opposite leaves moved quite independently of each other. This movement would aid that of the internodes in bringing the petioles into contact with surrounding objects. I discovered this spontaneous movement too late to be enabled to observe the leaves in all the other species ; but from analogy I can hardly doubt that the leaves of at least G. flammula, and G. vitalba move spontaneously; and, judging from G. Sieboldi, this probably is the case with C. montana and C. calycina. I ascertained that the simple leaves of C.

These facts are highly remarkable; for there can hardly be a doubt that in the dryer provinces of South Africa these plants must have propagated themselves for thousands of generations in an erect condition; and yet during this whole period they have retained the innate power of spontaneously revolving and twining, whenever their shoots become elongated under proper conditions of life. Most of the species of Phaseolus are twiners; but certain varieties of the P . multijlorus produce (Leon, p. 681) two kinds of shoots, some upright and thick, and others thin and twining.

The shoots, when placed near a vertical stick, either twine round it or clasp it with the basal portions of their petioles. The leaves whilst young are nearly of the same general shape, and act in the same manner like a hook, as will be described under C. viticella; but the leaflets are more divided, as in C. calycina, and each segment whilst young terminates in a hardish point, and is much curved downwards and inwards; so that the whole leaf readily catches and becomes entangled with any neighbouring object.

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