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Hair types in Polish selected taxa of Potentilla subsect. Collinae [Rosaceae]

100%

Kolodziejek J.

Acta Societatis Botanicorum Poloniae

2008

tom 77

nr 3

217-224

Leaf hair types in Polish selected taxa from Potentilla subsect. Collinae Juz., i.e. P. collina Wibel s.str., P. silesiaca Uechtr. P. thyrsiflora Hillsen ex Zimmeter, P. wimanniana Gilnther and Schummel, P. leucopolitana P.J. Milller and P. leucopolitana P.J. Milller x P. incana P. Graebner were studied. A total of five unicellular hair types could be distinguished, based on the structure of the hair: straight, involuted, crispate, curved and stellate. The occurrence of involuted, curved and stellate hairs was observed for the first time for the majority of investigated taxa. There is a variation in density, position, as well as in the number of arms of stellate hairs. Although they are difficult to see without a stereo microscope, these differences seem to be systematically important. The study of hair types on surfaces of leaves supports the opinion that P. collina s.lato is a hybrid between P. argentea L. s.la-to, P. tabernaemontani Ascherson and P. incana P. Gaertner. Hairs form consistent characters which are highly suited for systematic purposes. The key to Polish taxa based on leaf hair types is given as well.

Characteristics of achenes in Potentilla collina group [Rosaceae]

84%

Kolodziejek J., Gabara B.

Acta Societatis Botanicorum Poloniae

2007

tom 76

nr 1

Achenes morphology in taxa from Potentilla collina s.l. i.e., P. collina Wibel s.s., P. leucopolitana P.J. Müller, P. thyrsiflora Hülsen ex Zimmet., P. thyrsiflora var. isosepala Th. W., P. silesiaca Uechtr. And P. wimanniana Günther and Schummel was examined with stereoscope and scanning electron microscopy. Achenes of these taxa varied slightly in shape, size and colour, while marked differences among them appeared in the surface sculpture and in the dimensions of aril, dorsal ridge and ribs. SEM analyses allowed to distinguish two distinct morphological types of achenes. Type I - with ruminate sculpture and aggregates of some material, various in shape and size, at the surface of partly destroyed epidermal cells covering fruit wall in P. leucopolitana, P. wimanniana and P. thyrsiflora. Type II - with ruminate-reticulate sculpture due to well preserved epidermal cells in P. silesiaca and P. thyrsiflora var. isosepala. The obtained results have supported Błocki’s suggestion to treat P. thyrsiflora var. isosepala as a separate species named P. isosepala. However, similarities in the surface sculpture of achenes in some taxa of P. collina group did not facilitate their classification, therefore this feature may be a valuable taxonomical criterium only in combination with others.

Ograniczanie wyników

2 Acta Societatis Botanicorum Poloniae

2 Kolodziejek J.

1 Gabara B.

1 2008

1 2007

Wyniki wyszukiwania

Hair types in Polish selected taxa of Potentilla subsect. Collinae [Rosaceae]

Characteristics of achenes in Potentilla collina group [Rosaceae]