. The power of movement in plants. Plants; Botany. CHAr. VIL SLEEP OF LEAVES. 369 ciana OilUesii (botti belonging to Tribe 13), the leaves behave in the same manner. Fig. Hmmatoxylon Campechianum : A, branch during daytime ; B, branch with leaves asleep, reduced to two-thirds of natural scale. Cassia (Tribe 14).—The nyctitropic movements of the leaves in many species in this genus are closely alike, and are highly complex. They were first briefly described by LinncBus, and since by Dnchartre. Our observations were made chiefly on 0. flori- hunda * and corymbosa, but several other species
. The power of movement in plants. Plants; Botany. CHAr. VIL SLEEP OF LEAVES. 369 ciana OilUesii (botti belonging to Tribe 13), the leaves behave in the same manner. Fig. Hmmatoxylon Campechianum : A, branch during daytime ; B, branch with leaves asleep, reduced to two-thirds of natural scale. Cassia (Tribe 14).—The nyctitropic movements of the leaves in many species in this genus are closely alike, and are highly complex. They were first briefly described by LinncBus, and since by Dnchartre. Our observations were made chiefly on 0. flori- hunda * and corymbosa, but several other species were casually observed. The horizontally extended leaflets sink down verti- cally at night; but not simply, as in so many other genera, for each leaflet rotates on its awn axis, so that its lower surface faces outwards. The upper surfaces of the opposite leaflets are thus brought into contact with one another beneath the petiole, and are well protected (Fig. 154). The rotation and other move- ments are effected by means of a well-developed pulvinus at the base of each leaflet, as could be plainly seen when a straight narrow black line had been painted along it during the day. The two terminal leaflets in the daytime include rather less than a right angle: but their divergence increases greatly whilst they • I am informed by Mr. Dyer that Mr. Bentliam believes that C. floribundd (a common green- house bush) is a liybrid raised in France, and that it c'imes very near to C, Icevigatn. It is no doubt the same as the form described by lindley ('Bot. Eeg.,' Tab. 1422," ftft C. Nerhertiana,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Darwin, Charles, 1809-1882; Darwin, Francis, Sir, 1848-1925. New York, Appleton
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Keywords: ., bookcentury1800, bookdecade, booksubjectbotany, booksubjectplants
