IJBPAS, April, 2018, 7(4): 443-460 ISSN: 2277–4998 INVENTORY OF MOST RARE AND ENDANGEREDPLANT SPECIES IN ALBAHA REGION, SAUDI ARABIA ABDUL WALI A. AL-KHULAIDI1, 2, NAGEEB A. AL-SAGHEER2, 3*, TURKI AL-TURKI4, FATEN FILIMBAN5 1Department of Biology, College of Sciences and Art, Albaha University, Baljurashi, Saudi Arabia 2Agricultural Research and Extension Authority, Yemen 3Department of Biology, College of Sciences and Art, Albaha University, Qilwah, Saudi Arabia 4Biotechnology Center, The Herbarium and Genebank of the King Abdulaziz City for Science and Technology (KACST) 5Plant Sciences Division, Department of Biology, College of Sciences, King Abdul Aziz University, Jeddah, Saudi Arabia *Corresponding Author: E Mail:
[email protected] Received 17th Nov. 2017; Revised 15th Dec. 2017; Accepted 5th January 2018; Available online 1st April 2018 ABSTRACT Rare and endangered plant species have been investigated based on intensive field work covering all ecological zones in Albaha region, Saudi Arabia. Different cross sections were placed randomly along different ecological sites. In each different habitat types plant species were recorded and sampled by using quadrates 25 by 25 m, and then most rare and endangered species were identified according to the percentage of frequency. In this investigation 46 rare and endangered plant species belongs to 33 families and 41 genera in which 10 endemic to Arabian Peninsula were identified and documented. Names of plants, frequency percentage and density per hectare were gathered. The distribution of rare species, patterns of some most rare and endangered plant species were mapped by using ARC-GIS techniques. Keywords: Plant species, rare, endangered, endemic, near endemic, Albaha, Saudi Arabia 1.