. The power of movement in plants. Plants; Botany. Chap VII. BLEEP OF LEAVES. 353 Fig. Mi. Lotus (Tribe 4).—The nyotitropio movements of 10 species in this genus were observed, and found to be the same. The main petiole rises a little at night, and the three leaflets rise till they become vertical, and at the same time approach each other. This was conspicuous with L. JacobcBus, in which the leaflets are almost linear. In most of the species the leaflets rise so much as to press against the stem, and not rarely they become inohned a little inwards with their lower surfaces exposed obliquely to
. The power of movement in plants. Plants; Botany. Chap VII. BLEEP OF LEAVES. 353 Fig. Mi. Lotus (Tribe 4).—The nyotitropio movements of 10 species in this genus were observed, and found to be the same. The main petiole rises a little at night, and the three leaflets rise till they become vertical, and at the same time approach each other. This was conspicuous with L. JacobcBus, in which the leaflets are almost linear. In most of the species the leaflets rise so much as to press against the stem, and not rarely they become inohned a little inwards with their lower surfaces exposed obliquely to the zenith. This was clearly the case with L. major, as its petioles are unusually long, and the leaflets are thus enabled to bend further inwards. The young leaves on the summits of the stems close up at night so much, as often to resemble large buds. The stipule-like leaflets, which are often of large size, rise up like the other leaflets, and press against the stem (Fig. 145). All the leaflets of L. Gehelii, and pro- bably of the other species, are provided at their bases with distinct pulvini, of a yellowish colour, and formed of very small cells. The circumnutation of a terminal leaflet of L. perigrinvs (with the stem secured) was traced during two days, but the movement was so simjile that it is not worth while to give the diagram. The leaflet fell slowly from the early morning till about 1 It then rose gradually at first, but rapidly late in the evening. It occasionally stood still for about 20 m. during the day, and sometimes zigzagged a little. The movement of one of the basal, stipule-like leaflets was likewise traced in the manner and at the same time, and its course was closely similar to that of the terminal leaflet. In Tribe 5 of Bentham and Hooker, the sleep-movements of species in 12 genera have been observed by ourselves and. Trifolmm repens: oircum- nutation and nyctitropic movements of a nearly full - grown terminal leaflet, traced on a ver- tic
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