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Senna includes herbs, shrubs, and trees, since its height vary from 0,5 to 2 meters. The flower has five sepals and five usually yellow petals. There are ten straight stamens. The stamens may be different sizes, and some are staminodes. The fruit is a legume pod containing several seeds. 

It is a pest plant that affect cultivated soils, common in abandoned areas and grassland. It is widely spread in America, EUA, Argentina and Brazil.