Foliar Anatomy of Calliandra riparia Pittier an Elevation Gradient on the High Basin of the Tocuyo River, Venezuela
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Abstract
The leaf anatomy of Calliandra riparia was studied in an altitudinal gradient in order to establish the possible structural plasticity of this species to cope with environmental changes related with the increase on altitude. Leaves of adult plants growing at 800 and 1030 masl were collected, fixed in FAA (formaldehyde, acetic acid and ethanol) and then processed by classical techniques used in optical microscopy. The anatomy of the lamina, the midrib and the petiole were similar at both considered altitudes; however, differences were observed on quantitative anatomical variables of the leaf blade which seem to be related to the increase in solar radiation at the higher altitude. These differences show that this species develops some anatomical strategies at foliar level for its adaptation along the altitudinal gradient.
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