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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/11038

Title: Field trips were conducted from 1990 to 1999to a prominent "raudha" (meadow) in the Central Province of Saudi Arabia in order to study the vegetation and to present an up-to-date knowledge of its flora. The study area (Raudhat Khuraim), a wide and shallow depression, is one of the finest places in the entire arid and extra arid parts of the Arabian Peninsula due to its plant density and speciation. Raudhat Khuraim, a protected area from vehicular traffic, lies at the fringe of a stony and sandy desert in the North East of Riyadh city and acts as a refuge for Saharo-Arabian taxa during adverse climatic conditions. Since the area is in the middle of an arid region, the vegetation is largely seasonal with a high percentage (82%) of annual species that germinate and flower soon after the winter rains. A complete annotated flora of the Raudha is prepared for the first time, including 1 gymnosperm, 131 dicots and 21 monocots. The raudha and its neighboring regions are devoid of any endemic plants. However, at least one species, Delphinium orientale 1.Gay (Ranunculaceae), mainly of North African and Mediterranean origin, has been reported for the Arabian Peninsula on the basis of a single collection from Raudhat Khuraim. Simple keys and brief descriptions of species have been provided for easy determination.
Authors: Al-Yahya, M.A.
Ahmed H. Alfarhan
Keywords: Acute toxicity
oral doses
Issue Date: 2001
Publisher: American Journal of Chinese Medicine, .
Citation: 29(3-4): 525-532
Abstract: The acute toxicity of dried Nerium oleander leaves to Najdi sheep is described in 12 sheep assigned as untreated controls, N. oleander-treated once at 1 and 0.25 g/kg body weight and N. oleander-treated daily at 0.06 g/kg body weight by drench. Single oral doses of 1 or 0.25 g of dried N. oleander leaves/kg body weight caused restlessness, chewing movements of the jaws, dyspnea, ruminal bloat, incoordination of movements, limb paresis, recumbency and death 4-24 hr after dosing. Lesions were widespread congestion or hemorrhage, pulmonary cyanosis and emphysema, hepatorenal fatty change and catarrhal abomasitis and enteritis. The daily oral doses of 0.06 g dried N. oleander leaves/kg body weight caused less severe signs and death occurred between days 3 and 14. In these animals, the main lesions were hepatonephropathy and gelatinization of the renal pelvis and mesentry and were accompanied by significant increases in serum AST and LDH activities, in bilirubin, cholesterol and urea concentrations and significant decreases in total protein and albumin levels, anemia and leucopenia.
URI: http://hdl.handle.net/123456789/11038
Appears in Collections:College of Science

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