Abstract
Leaf hair types in Polish selected taxa from <em>Potentilla</em> subsect. Collinae Juz., i.e. <em>P. collina</em> Wibel s.str., <em>P. silesiaca</em> Uechtr. <em>P. thyrsiflora</em> Hillsen ex Zimmeter, <em>P. wimanniana</em> Gilnther and Schummel, <em>P. leucopolitana</em> P.J. Milller and <em>P. leucopolitana</em> P.J. Milller x <em>P. incana</em> <em>P. Graebner</em> 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 <em>P. collina</em> s.lato is a hybrid between <em>P. argentea</em> L. s.la-to, <em>P. tabernaemontani</em> Ascherson and <em>P. incana</em> 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.
Highlights
The material was obtained from herbarium sheets originating from herbaria: LE, PRA and BP for abbreviations see Holmgren et al 1990 except P. leucopolitana × P. incana which came from natural habitat in Poland
Collinae can be divided into five groups: straight, involuted, curved, stellate, flexuose and crispate (Table 1)
The macromorphological division of P. collina group proposed by Wolf (1908) based on the type of stylus, type of leaf division and position of the floriferous stems agrees with the type of hairs
Summary
The most of them (14 taxa) grow in Europe, i.e. P_alpicola De la Soie, P. alsatica T. P. argenteiformis Kauffm., P. aspegrenii Kurtto, P. collina Wibel, P. johanniniana Goiran, P. leucopolitana P. J. Müller, P. lindackeri Tausch, P. praecox F. J. Müller ex Zimmeter, P. silesiaca Uechtr., P. thyrsiflora Hülsen ex Zimmeter, P. wimanniana Günther and Schummel and P. wismariensis T. Remaining five taxa are found in Asia Minor, i.e. P_armeniaca Siegfr., P. lazica Boiss. Remaining five taxa are found in Asia Minor, i.e. P. armeniaca Siegfr., P. lazica Boiss. and Bal., P. sommieri Siegfr. and Kell., P. svanetica Siegfr. and Kell. and P. radiata Lehm
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