Abstract
Anatomical features of four Pilosella Vaill. taxa (P. officinarum Vaill., P. piloselloides (Vill.) Sojak subsp. bauhini (Schult.) S. Bräut. & Greuter, P.× hypeurya (Peter) Sojak, P. densiflora (Tausch) Sojak) collected from Black Sea Region of Turkey were investigated. Anatomical studies include transverse sections of root, stem and leaf with their illustrations. Although the anatomical properties are similar to the typical anatomy of dicotyledons, some differences were observed among them. While root anatomy of P. officinarum, P. piloselloides subsp. bauhini and P. densiflora consist of a single layer exodermis, there is 2-3 layer exodermis in the natural hybrid P. × hypeurya. Additionaly the root pith of this hybrid taxa completely composed of schlerenchyma cells in contrast to other investigated taxa. The stem anatomy of the investigated taxa is similar to each other except the number of the tracheidal elements. The numbers of the stomata per µm2 disticltly differ in P. piloselloides subsp. bauhini from the rest examined taxa.
Highlights
According to the monograph of Zahn (1921-1923), the genus Hieracium L. is divided into four subgenera and two of these, Hieracium L., Pilosella Vaill. are present in Turkey but Sell and West (1974) who prepared the account of Pilosella for the Flora of Turkey recognised these subgenera as a distinct genera
While root anatomy of P. officinarum, P. piloselloides subsp. bauhini and P. densiflora consist of a single layer exodermis, there is 2-3 layer exodermis in the natural hybrid P. × hypeurya
4 Pilosella taxa (P. officinarum, P. piloselloides subsp. bauhini, P. × hypeurya, P. densiflora) collected from different localities in Northeast Anatolia were investigated in term of anatomy
Summary
According to the monograph of Zahn (1921-1923), the genus Hieracium L. is divided into four subgenera and two of these, Hieracium L., Pilosella Vaill. are present in Turkey but Sell and West (1974) who prepared the account of Pilosella for the Flora of Turkey recognised these subgenera as a distinct genera. According to the monograph of Zahn (1921-1923), the genus Hieracium L. is divided into four subgenera and two of these, Hieracium L., Pilosella Vaill. Are present in Turkey but Sell and West (1974) who prepared the account of Pilosella for the Flora of Turkey recognised these subgenera as a distinct genera. Phytochemical (Petrovic et al 1999) and molecular (Shi et al 1996) studies on the genus Hieracium s.l. strongly support the morphologically based classifications, Pilosella is generally treated as a distinct genus, based on a whole range of morphological, biochemical, cytological and genetical characteristics (Braütigam and Greuter 2007). Pilosella is well known for its taxonomic complexity and sufficiently different from the genus. The genus Pilosella was represented with 35 species including 13 hybrids between most species that grow together in Turkey (Coşkunçelebi 2012). It is reported that it is used for the treatments of bronchitis, bronchitic asthma and whooping caugh (Grieve 1995)
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