Abstract
The genera Tetraena Maxim. and Zygophyllum L. (Zygophyllaceae) present different morphological characters, viz. growth habit, leaf features, flower traits and fruit shape, and have a high diversity of species in Africa, Australia and Asia. Six species of Tetraena [T. alba (L.f.) Beier & Thulin, T. coccinea (L) Beier & Thulin, T. decumbens (Delile) Beier & Thulin, T. hamiensis (Schwein f.) Beier & Thulin, T. propinqua (Decne.) Ghaz. & Osborne and T. simplex (L.) Beier & Thulin], and one species of Zygophyllum (Z. fabago L.) have been identified in Saudi Arabia, most of which grow in sandy soils and saline habitats as shrubs and herbs. One new endemic variety (T. alba var. arabica Alzahrani & Albokhari) along with four new combinations [T. alba var. amblyocarpa (Baker) Alzahrani & Albokhari, T. hamiensis var. qatarensis (Hadidi ex Beier & Thulin) Alzahrani & Albokhari, T. hamiensis var. mandavillei (Hadidi ex Beier & Thulin) Alzahrnai & Albokhari, and T. propinqua subsp. migahidii (Hadidi ex Beier & Thulin) Alzahrani & Albokhari] are proposed. Descriptions, illustrations, distribution maps and a key for identification of the taxa are presented. Conservation status has been proposed for the new variety and combinations.Bangladesh J. Plant Taxon. 25(1): 19-43, 2018 (June)
Highlights
The genus Zygophyllum L. distributed in Saudi Arabia received much attention based on morphological and anatomical characters (Hadidi, 1978; Migahid, 1978, 1996; Hosny, 1988; Mandaville, 1990; Chaudhary, 2001; Soliman et al, 2010; Waly et al, 2011)
According to the most recent taxonomic proposal of Tetraena Maxim. and Zygophyllum presented by Beier et al (2003), the most Saudi Arabian taxa of Zygophyllum were transferred to Tetraena
The present revisionary study of Tetraena Maxim. and Zygophyllum L. in Saudi Arabia is based on extensive field survey, literature and analysis of more than 348 specimens, including types and images of types from different herbaria, viz. BM, CAI, CAIM, E, K, KAUH, KSU and RIY
Summary
The genus Zygophyllum L. distributed in Saudi Arabia received much attention based on morphological and anatomical characters (Hadidi, 1978; Migahid, 1978, 1996; Hosny, 1988; Mandaville, 1990; Chaudhary, 2001; Soliman et al, 2010; Waly et al, 2011). Zygophyllum presented by Beier et al (2003), the most Saudi Arabian taxa of Zygophyllum were transferred to Tetraena. Zygophyllum and Tetraena have similar morphological characters, viz. Beier et al (2003) showed that Zygophyllum and Tetraena could be distinguished from each other by the characters of fruit dehiscence and staminal appendages. Ghazanfar and Osborne (2015) transferred this species to Tetraena propinqua
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