Recently we found the weed species Filago arvensis on a fallowed sandy field in Thyrow, East Germany; the field is part of a long-term trial on cropping systems, with the fallow being one of the three courses of the old "unimproved" three course rotation. No mineral fertilizer has been given to these plots for more than a decade. Because Filago arvensis is Red-Listed in Germany I would like to know more about its current distribution and population trend. Also it would be great to link up with other people working on this species.
Do you know this page:
https://deutschlandflora.de/map.phtml?config=taxnr2449&PHPSESSID=cgs3ru6e4se7b9utjtls46vi53&resetsession=allGroups
I don't know if the data is not to old in some cases but you can usually get a quick overview over the distribution of on species.
Dear Christiana Luise-Roß,
I had a look into a distribution map "North Hesse" from Nitsche et al. 1988, Flora des Kasseler Raumes, Naturschutzring Nordhessen e.V." ISSN 0932-1497, ISBN 3-926915-07-2 things will have changed in the meantime, certainly.
Regards,
Helmut
Dear both, thanks very much for these helpful answers!
- Best wishes, Thomas
The Filago group (Asteraceae, Gnaphalieae) comprises eleven genera, mainly distributed in Eurasia, northern Africa and northern America: Ancistrocarphus, Bombycilaena, Chamaepus, Cymbolaena, Evacidium, Evax, Filago, Logfia, Micropus, Psilocarphus and Stylocline. The main morphological character that defines the group is that the receptacular paleae subtend, and more or less enclose, the female florets. The aims of this work are, with the use of three chloroplast DNA regions (rpl32-trnL intergenic spacer, trnL intron, and trnL-trnF intergenic spacer) and two nuclear DNA regions (ITS, ETS), to test whether the
Filago group is monophyletic; to place its members within Gnaphalieae using a broad sampling of the tribe; and to investigate in detail the phylogenetic relationships among the Old World members of the Filago group and provide some new insight into the generic circumscription and infrageneric classification based on natural entities. Our results do not show statistical support for a monophyletic Filago group. The traditional generic circumscription of most of the genera, as well as the traditional infrageneric classification of the genus Filago, do not correlate with the inferred phylogenetic relationships. A monophyletic circumscription
of Filago and a new subgeneric treatment for this genus are proposed, this involving description of a new subgenus (Filago subg. Crocidion Andrés-Sánchez & Galbany, subg. nov.) and four new combinations (Filago subg. Pseudevax (DC.) Andrés-Sánchez & Galbany, comb. et stat. nov.; Filago discolor (DC.) Andrés-Sánchez & Galbany, comb. nov.; Filago gaditana (Pau) Andrés-Sánchez
& Galbany, comb. et stat. nov. and Filago griffithii (A. Gray) Andrés-Sánchez & Galbany, comb. nov.). The genera Cymbolaena, Evacidium and Evax are synonymised under Filago. Several incongruences found between chloroplast and nuclear DNA sequence analyses, as well as a notable degree of intraspecific sequence variation in all regions sequenced are documented.
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