Ralf Jahn

Ralf Jahn

About

16
Publications
6,533
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269
Citations
Additional affiliations
January 1997 - March 2016
false
Position
  • Researcher
October 1990 - December 1996
University of Regensburg
Position
  • Researcher

Publications

Publications (16)
Book
Full-text available
More than 2.100 endemic, autochthonous, introduced and invasive species, subspecies and varieties are described on 1.255 pages. 2.475 colour photographs enable a reliable identification of all described species. The monographs contain a detailed description, the flowering period, habitat and distribution. 1254 pages. Language: English. Full text i...
Technical Report
Full-text available
Iridaceae 158. Crocus pallasii Goldb. Bu Rhodopi Mts (Eastern): , 250 m, 41°26’32.9”N, 26°08’18.7”E, 01.12.2023, coll. V. Trifonov (SOA 0663392). New for that floristic region.
Article
This study aims to test the extrapolation effects of species distribution models (SDM) using three groups of predictor variables: climate, relief and geology (bedrock type). We highlight potential ecological differences for selected taxa, regarding both generalists and specialists in terms of edaphic conditions. We used distributional data of 12 wo...
Article
Full-text available
Understanding co-occurrence and ecological affinities of plant species is essential in vegetation and landscape ecology. In a case study, we analysed distribution records with high data density of all commonly occurring tree and shrub species of Crete (Greece) with offshore islands. We present the ecological range of widespread and more range-restr...
Article
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View or download at http://www.bioone.org/doi/10.3372/wi.45.45312 Photos: https://www.flickr.com/photos/24682427@N04/albums/72157658025413328
Article
Full-text available
This is the third of a series of miscellaneous contributions, by various authors, where hitherto unpublished data relevant to both the Med-Checklist and the Euro+Med (or Sisyphus) projects are presented. This instalment deals with the families Isoetaceae; Amaranthaceae, Callitrichaceae, Campanulaceae, Caryophyllaceae, Chenopodiaceae, Compositae, Cr...
Article
Full-text available
Gavdopoula is an island of 177.5 ha in the S Aegean, near the southeasternmost point of Europe. Based on field excursions in 1998/99 and 2009/10, we provide an annotated floristic catalogue of 186 vascular plant and 13 bryophyte taxa, with a full record of herbarium specimens and field observations, being the first botanical inventory of the island...
Article
Full-text available
In the course of the compilation of a checklist of the high-rank syntaxa of Europe, it turned out that for several syntaxa no valid and le-gitimate names were available. With this contribution, we aim to solve some of the problems by publishing or validating seven syntaxon names (1 order, 5 alliances, 1 association) and by proposing a nomen novum f...
Article
Full-text available
Cerastium deschatresii and C. scaposum subsp. peninsularum are described as two closely related taxa new to science. C. scaposum (subsp. scaposum) was described from the White Mountains (Lefka Ori) and was long believed to be restricted to the western segment of Crete, but it has been gathered once, in 1942, at the island's opposite end. It is a la...
Article
Full-text available
Tzanoudakis, D.: Flora and phytogeographical significance of the islands Chrisi, Koufonisi and nearby islets (S Aegean, Greece). – Willdenowia 31: 329-356. 2001. – ISSN 0511-9618. An annotated floristic catalogue is provided for the islands Chrisi (Gaidouronisi), Koufonisi and the nearby islets Mikronisi, Strongili, Makrouli and Trachilos, all off...
Article
Full-text available
457 vascular plant species (+ 12 infraspecific taxa) are recorded from Gavdos, the southernmost European island, including 297 (+ 11) new records. Matricaria aurea is a new record for the Greek flora; Astragalus epiglottis, Erodium cicutarium subsp. bipinnatum, Lolium subulatum. Valerianella pumila and Vicia saliva subsp. amphicarpa represent new f...
Book
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