Abstract
A total of 127 species belong to 101 genera and 37 families of vascular plants were recognized . Fabaceae (19 spp), Astraceae (18 spp), Poaceae (18 spp), Chenopodaceae (8 pp) and Brassicaceae (7 spp) were the largest families.The annuals ( therophytes ) and the perennial herbs were the most frequent indicating the spring charachteristic physiognomy of the studied area.The plant biodiversity of Chilat in spring based on Shannon Weiner index was 2.07 and Simpson index was 0.194 , but the highest species richness value based on the same indices respectively were 2.15 and 0.16 in station 1. In spring the annual Plantago boisseri has the hightest frequency with a relative abundance 20% and IVI 80.31,while the most dominant perennial species were Pennisetum divisum , Hamada salicornica ,Cornulaca monocantha and Artemsia herba-alba . Based on Sorensona¾½s Coefficient , the similarity between the two stations studied was 0.604 and the Jaccard Coefficient was 0.433. Ziziphus nummularia is very common Big shrub species forming a characteristic community recognized here for the first time.
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