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Centaurea L. sect. Ptosimopappa, a local endemic group in the Mediterranean and South East Anatolia, is represented by only two species, namely C. ptosimopappa Hayek and C. ptosimopappoides Wagenitz in Turkey. Both these species show a very restricted distribution as serpentine habitat indicators and are recorded as vulnerable. Present study was carried out to enlighten the morphological, anatomical and ecological features of these two species in detail. The structure of achene, indumentum and pollen grains were investigated by using Scanning Electron Microscope (SEM). The capitulum, involucre and leaf structure of these two species are rather similar, but their achenes and pollen grains differ from each other. In C. ptosimopappa pollen spinules are densely distributed but in C. ptosimopappoides they are sparsely distributed. The achenes are obovate in C. ptosimopappa and rectangular in C. ptosimopappoides. C. ptosimopappa is a scrub species but C. ptosimopappoides is a subscrub species. A negative relation in terms of the proportion of sand to silt content of the soil and positive relation between the percentage of CaCO 3 and pH was observed for C. ptosimopappa (p < 0.05). A negative relation in terms of the proportion of sand to silt content of the soil was observed in C. ptosimopappoides (p < 0.01).

PPlants have been grown for natural dyes to produce a wide range of colors.. N Natural dyes become increasingly important these days as synthetic dyes cause serious damage to the environment and have to be replaced. The published records show that Turkey has about 10,000 taxa of higher plants, 145 of which come from 92 genera and 51 families and can be used as dyeing sources of 17 colors. The most common families used for dyeing are Asteraceae, Rosaceae, Lamiaceae, Polygonaceae and Euphorbiaceae, and the dominating genera are Rumex, Anthemis, Euphorbia, and Salvia. Dye plants are of great medicinal value as well and can be used for producing antihelmintic, antiseptic, appetizer, carminative, diuretic, exudative, laxative, sedative and stomachic preparations.

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