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Turkey has one of the richest plant diversities in the Mediterranean region. In the current literature, no broad screening has been conducted on the potential allelopathy of plants from Turkey. This study aimed to evaluate the allelopathic activity of a large number of plants from Turkey for the first time and to determine the species with significant plant growth inhibitory potentials by bioassay. Dried samples of different plant parts were collected from local herbalists. The sandwich method was used to evaluate the potential allelopathy of 126 medicinal plants belonging to 55 families. The results of lettuce radicle and hypocotyl growth for 10 and 50 mg sample treatment conformed to normal distribution. Significant inhibition on lettuce radicle elongation with 10 mg sample was observed in 40 species, out of which 27 species showed over 50% inhibitory activity. The results suggested that these species could contain potential inhibitory compounds against lettuce radicle or hypocotyl growth. The calyxes of Hibiscus sabdariffa (3.2% of control) and the seeds of Prunus dulcis (5.7% of control) showed the most potent growth inhibitory activity on lettuce radicle elongation. The potential plant growth inhibitory effects of these plants, together with the fruits of Rhus coriaria and seeds of Prunus mahaleb, have been reported in this study for the first time. All these plants are medicinal, and the results hereby presented provide essential information about the allelopathic effects of medicinal plants from Turkey.

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Ferula caspica and Ferula szowitsiana grow in the same area of Central Anatolia. According to Flora of Turkey, they can be easily confused for one another during the flowering time. In this study, morphological and anatomical features of these two species were examined in order to reveal their differences. Leaves, flowers and fruits of these two species were examined and necessary measurements were made. The proliferation in the inflorescence of F. caspica, was not observed in the species F. szowitziana.There were distinct morphological differences in the fruits, also, the numbers of the secretory channels were different in the anatomical sections of mericarps. Morphological differences were observed in leaf lobes of these two species. As a result, the data that can be used to distinguish between these species are shown.

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