Al-Jabal Al-Akhdar (the Green Mountain) of Cyrenaica, Libya is known to have the highest plant species diversity in the country, particularly in the depressions and the valleys of the mountain. Wadi Al-Kouf is the largest valley in the mountain, with a rich flora of aromatic and medicinal plants. The present investigation was conducted to record and list the medicinal plant species growing in the valley during the flowering season of 2019. Results revealed that Wadi Al-Kouf hosts 107 medicinal plant species belonging to 49 families and 93 genera. Dicotyledons were the most represented group of angiospermae with 38 families, 79 genera and 89 species, whereas Monocotyledons were represented by only 8 families, 10 genera and 13 species. Asteraceae, Lamiaceae, Fabaceae and Solanaceae were the families with the highest number of species; 11, 9, 6 and 6 species, respectively. The most dominant life forms found in the valley were Therophytes (25.2%), Phanerophytes (25.2%) and Chamaephytes (24.3%), followed by Hemicryptophytes (15.9%) and Geophytes (9.3%). Nine endemic species were detected and recorded.

Acacia nilotica. L commonly known as babul, kikar or Indian gum Arabic tree, has been recognized worldwide as a multipurpose tree. Set of experiments were conducted  for  evaluation of the allopathic effects of water extracts of  different parts (park, leaves and pods)  of  A. nilotica as well as  soil extracts  under canopy on seed germination and  seedling  development of  receptor specie (Cucumus sativus L.) under different concentration (1%, 5% and 10% ).  Inhibitory effect of the different donor plant parts water extracts was ranked as follows: pod > leaf > bark. Soil extracts at different distances from trunk had stimulatory effect at 2m and 5 m distance while at the edge showed inhibitory effects on seed germination and seedling development of both C. sativus L.

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