File:Foundations of botany (1901) (14597492618).jpg

Identifier: foundationsofbot00berg (find matches)
Title: Foundations of botany
Year: 1901 (1900s)
Authors: Bergen, Joseph Y. (Joseph Young), 1851-1917 Bergen, Joseph Y. (Joseph Young), 1851-1917. Bergen's Botany: key and flora, Northern and Central States ed. 1901
Subjects: Plants
Publisher: Boston : Ginn
Contributing Library: The LuEsther T Mertz Library, the New York Botanical Garden
Digitizing Sponsor: The LuEsther T Mertz Library, the New York Botanical Garden

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Text Appearing Before Image:
Fig. 111. —Leaf-Mosaic of aCampanula. 144 FOUNDATIONS OF BOTANY
Text Appearing After Image:
152. Daily Movements of Leaves. — Many compoundleaves have the power of changing the position of theirleaflets to accommodate themselves to varying conditionsof light and temperature. Some plants have the powerof directing the leaves or leaflets edgewise towards thesun during the hottest parts of the day, allowing them to extend their surfacesmore nearly in a hori-zontal direction duringthe cooler hours. The so-called sleep of plants has long been „ „„ 4T ^ *T> , r., known, but this subiect Fig. 112. —a Leaf ol Eed Clover. J At the left, leaf by day ; at the right, the same haS been mOSt Carcf ully lea^ asleep at night. studied rather recently. The wood sorrel, or oxalis, the common bean, clovers,and the locust tree are some of the most familiar ofthe plants whose leaves assume decidedly different posi-tions at night from those which they occupy during theday. Sometimes the leaflets fise at night, and in manyinstances they droop, as in the red clover (Fig. 112) andthe aca

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