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Guaiacum
Guaiacum officinale, Guaiacum officinale
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Tribulus
Tribulus cistoides, Tribulus terrestris, Tribulus terrestris, Tribulus terrestris
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Zygophyllum
Zygophyllum fontanesii
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Description of Zygophyllaceae
http://biodiversity.uno.edu/delta/angio/www/zygophyl.htm
Habit and leaf form; Anatomy; Morphology; Physiology; Biochemistry; Geography.