. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. f Indian corn and grasses, seem to wilt or to roll up when the weather is hot, and loss of moisture is thereby The flower of the California poppy, or eschscholtzia, which is common in gardens, opens at day and closes at night. Observe, also, the flower of pussley, the garden portulaca or rose-moss, oxalis, and some of the mallows. Other flowers open at night and close at day. This diurnal move-ment of the parts of plantsis known as the sleep ofplants. 509a. It is not a Sleep, h
. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. f Indian corn and grasses, seem to wilt or to roll up when the weather is hot, and loss of moisture is thereby The flower of the California poppy, or eschscholtzia, which is common in gardens, opens at day and closes at night. Observe, also, the flower of pussley, the garden portulaca or rose-moss, oxalis, and some of the mallows. Other flowers open at night and close at day. This diurnal move-ment of the parts of plantsis known as the sleep ofplants. 509a. It is not a Sleep, however, in the sense of being a rest or period of recuperation for the plant. How these movements are produced is not definitely known, but they are associated intimately with the stimuli exerted by light and darkness, heat and cold. The utility of the movement is also in dispute. Darwin found that the position of sleeping leaves Fio. 423. at night is such as to conserve the vital Night position of oxalis heat of the plant, and it is possible that leaflets. some of this leaf-movement has arisen as. 404 ZSSSOJVS WITS PLANTS a direct means of adaptation to oiroumstanoes or as a protectionto the plant; but in the present state of our knowledge, this is largely assumption.
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Keywords: ., bookauthorbai, bookcentury1900, bookdecade1900, booksubjectbotany
