The leaves and stems of five Tabebuia species were collected by taking permission from the directors of two different botanical gardens: T. argentea Britton and T. guayacan (Seem.) Hemsl. were collected from Al-Zohriya garden, Zamalek, Cairo Governorate, Egypt; and T. pulcherrima, T. pallida L., and T. rosea (Bertol.) DC. were collected from the botanical garden in Aswan (El-Nabatate island), Aswan, Egypt. All plant samples were identified by Prof. Dr. Abdel-Halim Mohammed (Professor of Agriculture, Flora Department, Agricultural Museum, Dokki, Giza, Egypt) and collected according to plant collections guidelines of Alberta Native Plant Council 2006. Voucher specimen kept in the Botanical garden in Aswan, Aswan, Egypt with number (Ta 1–10) were deposited. Plant materials were washed separately with fresh water and dried in the shade with occasional sun for several days. The dried materials were ground into coarse powder by a grinding machine and the materials were stored at room temperature for future use.

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