Comparison Between Two Eryngium From Turkey: E. heldreichii and E. davisii.


XIII. Optima Meeting, Turkey, 1 - 04 July 2012, vol.24, pp.243-247

  • Publication Type: Conference Paper / Full Text
  • Volume: 24
  • Country: Turkey
  • Page Numbers: pp.243-247
  • Istanbul University Affiliated: Yes


Teucrium creticum L. and T. orientale L. var. orientale are two related taxa in Teucrium sect. Teucrium. In this study, the
value of anatomical and micromorphological characters for distinguishing between these two taxa is analysed. Transverse
sections of the stem, as well as both transverse and surface sections of the leaves were examined anatomically. According to
the data obtained, collenchyma and sclerenchyma do grow more in T. creticum than in T. orientale var. orientale. The
leaves of T. creticum are hypostomatic and have a characteristic hypodermis, which is under the upper epidermis, as well
as abundant spherocrystals in the upper epidermis. The leaves of T. orientale var. orientale are amphistomatic, yet no
spherocristals exists in epidermal cells and the hypodermis is absent. The results obtained from studies carried out under
scanning electron microscope (SEM) shows that the nutlet micromorphology varies between the two taxa. In both taxa,
the nutlet surfaces are reticulate and glandular. Eglandular hairs do occur. However, in T. orientale var. orientale,
2060 mm long eglandular hairs with scabrid surface occur only along the margins of the nutlets, whereas the 3=4 dorsal
sides of the nutlets in T. creticum are all covered with 90500 mm long, smooth-surfaced hairs. Additionally, while the
glandular hairs on the nutlets of T. creticum are subsessile, those on the nutlets of T. orientale var. orientale are capitate
and distinctly stalked