An Anatomical and Caryological Investigation On Monotypic Pallenis spinosa (L.) Cass. in Turkey

Pallenis spinosa (L.) Cass., which has an annual and herbacous life form, is represented by a single species (monotypic) in Turkey. There are 1-2 rows of epidermis cells in the root cross section of the taxon. Between the epidermis and the central cylinder is the cortex, which consists of parenchymatic cells. Root has a radial vasculer bundle. The cross-section of the stem has a round shape with single row and regular lined of cortex cell over the vascular bundle as a starch sheath. The sclerenchyma cells is cover the top of floem cells in the collateral vascular bundle. The leaves is a bifacial type. There are stomas and eglandular hairs both side of the leaves. Sclerenchyma cells are both side of vascular bundles in the leaves. We determined 2x = 2n = 10 chromosome number and made chromosome measurement and haploid idiogram of species.