Life-forms and chorotypes of succulent plants of al-Dale'a governorate, Yemen

Abstract EN

The present study was carried out during the years 2015- 2019, deals with the floristic composition of the flora, life forms and phytogeographical affinities of Succulent plants of Adhale Governorate, Yemen., The succulent flora of the study area consisted of 104 succulent taxa belonging to 52 genera and 29 families.

Life form of study area, was dominated Chamaephytes with the maximum number of species they were represented by 46species (44.23%), followed by Phanerophytes represented by 29 species (27.88%), Geophytes represented by 13species (12.5%), Hemicryptophytes represented by 9 species (8.65%) Therophytes represented by 6 species (5.7%) and 1 parasite (0.96%).

From the chronological point of view, the largest proportion of the succulent flora belongs to Monoregional constituting 77.8% (81) of species is native to the Sudano-Zambenzian phytochoria.

The second dominant phytochoria was Bi-Regional constitute (11.46 %) "Sudano-Zambenzian + Saharo-Sindian (11 sp.

10.5%) and Sudano-Zambenzian + Mediterranian (1 sp., 0.96%), while Plueriregional comprises (11sp.; 10.57%) "The Tri-Regional element "Sud- Zam+Sah-Sin+Med, 3 sp.

Cosm.

5 sp.; Trop.

2 sp.; Pan.

1 sp.

Results also revealed that 41 taxa (39.4%) are endemic, (among them are 21 taxa (20.19%) which were endemic to Yemen alone, while the remaining (19.23%) are near endemic.