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King Abdulaziz University (2006)

Taxonomic Studies Of the Genus Zygophylluml (Zygophyllaceae) In Saudi Arabia

Ashumrani, Rahma Ibrahim

Titre : Taxonomic Studies Of the Genus Zygophylluml (Zygophyllaceae) In Saudi Arabia

دراسة تصنيفية لجنس الزيجوفيللم (العائلة الرطريطية) بالمملكة العربية السعودية

Auteur : Ashumrani, Rahma Ibrahim

Université de soutenance : King Abdulaziz University

Grade : Master 2006

Résumé partiel
Zygophyllum L., the largest genus of Zygophyllaceae comprises about 100 species known from the Meditterranean to Central Asia, more than eleven species growing in Saudi Arabia specially in desert and saline habitats, This study deals with taxonomy of Zygophyllum species growing in Saudi Arabia depending on morphological and anatomical characters of stems, leaves, and petioles to eleven investigated species. By comparing the morphological results of eleven Zygophyllum species under investigation, Z. album ; Z. boulosii ; Z. coccineum ; Z. decumbens ; Z. fabago ; Z. hamiense ; Z. mandavillei ; Z. migahid ; Z. propinquum ; Z. qatarense and Z.simplex, we conclude that we have characters of major importance such as plant habitat, shape of leaves and characters of minor importance such as shape, and size of the fruit. Those characters enabled the construction of an artificial morphological key separating Z. simplex from the other ten species by its herbaceous habitat and simple sessile leaves. The other ten investigated species divided into too categories, one with lower simple and upper compound leaves and include Z. hamiense ; Z. mandavillei ; Z. qatarense the other with upper and lower compound bifoliate leaves include Z. album ; Z. boulosii ; Z. coccineum ; Z. decumbens ; Z. fabago ; Z. migahidii ; Z. propinquum Characters of shape, and size of the fruit and shape of leaflets can be differentiated between the ten species of the two categories. Anatomical features of stem, leaves and petiole of the elven investigated Zygophyllum species show characters of major importance such as stem outline, leaf outline, the arrangement of leaf vascular tissue, in addation to the number of vascular bundles in the inner leaf whorl, and characters of minor importance such as leaf mesophyll, and the branching of the main vascular bundle in the petiole Those characters enabl us to separate Z. simplex from the other ten species by its cup shape transverse section in stem.

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Page publiée le 24 décembre 2014, mise à jour le 4 décembre 2017