In the present study, a new species of genus, Tripleurospermum eskilensis (Asteraceae), is described from Central Anatolia, Turkey. The has been collected Eskil region in restricted area (Aksaray Province). It grows salty steppe, and closely related to T. decipiens terms morphological characteristics. also morphologically compared with discoid disciform capitulated This study includes its detai...

Raveniopsis microphyllus K.Wurdack, sp. nov., a new species known only from a single peak in the Pakaraima Mtns. of Guyana, is described and illustrated. This white-flowered shrub adds to the many narrow-endemic Guiana Shield species in the genus, and is unique in bearing small, trifoliate, sclerophyllous leaves. Leaf anatomy and surface micromorphology of the new species were examined to docum...

In this study, the achene mucilage content of six Turkish endemic Tripleurospermum taxa, namely T. baytopianum E. Hossain, conoclinium (Boiss. & Bal.) Hayek, fissurale (Sosn.) hygrophilum (Bornm.) Bornm., rosellum Orph.) Hayek var. album Hossain and ziganaense Inceer Hayirlioglu-Ayaz was determined by micro-staining reactions. Within examined cells on surface are capable forming a musil...

Modes of reproduction vary considerably in the genus Taraxacum. In particular, extent and distribution sexuality are decisive criteria for evaluation variation taxonomic conclusions this complicated genus. Taraxacum sect. Borealia is widespread Arctic Subarctic regions Asiatic part Russia, but sexual has not been known to occur there, unlike T. Arctica with a number sexually reproducing species...

Soil organic matter contains fractions that range from very active to passive, relative to microbiological activity Soil organic matter (SOM) contains fractions that range from very (Schimel et al., 1985), suggesting that classification of active to passive, relative to microbial-driven ecosystem processes and functions. A classification system is needed that can test the hypothesis SOM forms m...