Abstract
<em>Erysimum pieninicum</em> (Zapał.) Pawł. (<em>Brassicaceae</em>) is an endemic species, growing only in Pieniny Mts. The aim of the presented work was to investigate its pollen morphology as well as its ultrastructural traits of pericarp and seed-coat. Pollen grains of this species were of small size, 3-zonocolpate with reticulate ornamentation. The external siliqua surface was of rugose sculpture, covered by numerous, stellate hairs. The internal surface of the fruit was naked and characterized by striate sculpture. The seed-coat ornamentation of <em>E. pieninicum</em> was of blister type.
Highlights
According to Koch and others (2003) Erysimum is taxonomically one of the most difficult genus of the mustard family (Brassicaceae) and extensive phylogenetic studies on this taxon are necessary
In this study pollen grains of Erysimum pieninicum were of small size; on average length of polar axis (P) was 18.00 μm and equatorial axis (E) 17.25 μm
This study shows that pollen grains of Erysimum pieninicum present the typical structure, characteristic for the other nine European species of the genus, that have been investigated before (Anchev and Deneva 1997; Halbritter 2006)
Summary
According to Koch and others (2003) Erysimum is taxonomically one of the most difficult genus of the mustard family (Brassicaceae) and extensive phylogenetic studies on this taxon are necessary. It comprises many taxa of uncertain status and the total number of described species oscillates between 80 and 180 (Latowski 1975; Koch et al l.c). Vaughan and Whitehouse (l.c.) noticed that testa may be of greatest value in determining taxonomic relationships within the mustard family. Latowski (l.c.) analyzing both morphological and anatomical traits of seeds of all Polish Erysimum species with the use of light microscope, was not able to clearly separate some taxa. Detailed investigations on the anatomy of the chazal endosperm cyst of 11 genera of Brassicaceae (Brown et al l.c.) showed the potential taxonomic value of this feature
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