-In the present study, the micromorphological structure of achene, pappus and style using scanning electron microscope (SEM), stomatal characteristics, anatomy of stem and achene together with chromosome number and nuclear DNA content of the Turkish endemic Crepis macropus Boiss. & Heldr. are provided in order to expand knowledge of its taxonomy. The SEM studies in this species show that dense spiny cells are found on the achene surface, the pappus bristle has 3-5 spikes and the style possesses slender papillae. The stem structure is composed of epidermis, collenchyma, parenchymatous cortex and pith. The species has anomocytic stomata in both the upper and the lower surface of the leaves. The pericarp of the achene is mainly composed of several layers of sclerenchymatous cells. In this species, the chromosome number is 2n = 2x = 8, karyotype consists of two submetacentric and six subtelocentric chromosomes and nuclear DNA content (2C-value) is 12.96 pg. These data are presented here for the fi rst time and their taxonomic values are discussed.

Nuclear genome size (C-value) was determined by flow cytometry for 23 populations of 15 Crepis L. (Asteraceae) taxa originating from Turkey. Genome size of seven taxa are reported for the first time as well as two new chromosome counts. The 1C-value of the studied taxa ranges from 1.35 pg to 7.06 pg, which represents more than fivefold variation. There is a positive correlation between genome size and altitude. Genome size is not correlated with the chromosome number and sectional division of the studied taxa. Systematic and ecological significance of genome size are discussed within the framework of the results obtained in this study.

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Achene anatomy and stomatal characteristics of eighteen Crepis taxa from Turkey are here described for the first time. In all taxa examined the pericarp is composed of several layers of sclerenchymatous and parenchymatous cells. As for the achene, differences among taxa mainly concern the pericarp structure and its thickness and width. Stomata are present on both surface of the leaf in all studied taxa and all taxa have anomocytic type stomata. However, the dimensions (length and width) and density of the stomata differ significantly among the studied taxa. In addition, the dimensions of stomata are negatively correlated with stomata density. It is concluded that achene anatomy and stomatal characteristics are useful for delimitation of Crepis taxa and a key to taxa based on these characters is provided. However, based on achene anatomy and stomatal characteristics, we found no argument for an exclusion of the Lagoseris group from Crepis as has previously been proposed.

Crepispalaestina subsp. babcockii Inceer & Aksu Kalmuk subsp. nov. (Asteraceae, Cichorieae) is described and illustrated. It grows in shady places and red pine forest in southwest Anatolia, Turkey. The chromosome number of the new subspecies is 2n = 2x = 8. The diagnostic morphological characters that distinguish C. palaestina subsp. babcockii from morphologically similar taxa C. palaestina subsp. palaestina and C. pulchra are discussed, and a conservation status for the new taxon is suggested.Bangladesh J. Plant Taxon. 25(1): 45-49, 2018 (June)