It may be due to insufficient illumination (Etiolation), as seen in geraniums kept in too shaded a situation, and is then accompanied by soft tissues, elongation of internodes, leaves usually reduced in size, &c. The laying of wheat is a particular case.
False etiolation may occur from too low a temperature, often seen in young wheat in cold springs.
Pflanzenkrankheiten, the Gardeners Chronicle, &c. Etiolation, &c.Pfeffer, Physiology of Plants, and other works on physiology.
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