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The genus Pilosella in the Nordic countries

Tyler, Torbjörn LU (2001) In Svensk Botanisk Tidskrift 95(1). p.39-67
Abstract
An unprejudiced revision of the genus Pilosella (Asteraceae) in the Nordic countries has been attempted. A completely new system for the taxonomy of these mostly facultative apomicts is presented. It is argued that all existing systems are inappropriate in the light of the complicated, and largely unknown, reproductive biology of these taxa. Previous systems have either treated these taxa as obligate apomicts or as ordinary sexual species and in both cases serious conflicts with the nature of the plants have arisen. It is also evident that the existing systems are either too complex or too simplified to be useful in floristic investigations. In the proposed system, the rank of species is employed for groups of forms which are... (More)
An unprejudiced revision of the genus Pilosella (Asteraceae) in the Nordic countries has been attempted. A completely new system for the taxonomy of these mostly facultative apomicts is presented. It is argued that all existing systems are inappropriate in the light of the complicated, and largely unknown, reproductive biology of these taxa. Previous systems have either treated these taxa as obligate apomicts or as ordinary sexual species and in both cases serious conflicts with the nature of the plants have arisen. It is also evident that the existing systems are either too complex or too simplified to be useful in floristic investigations. In the proposed system, the rank of species is employed for groups of forms which are morphologically readily distinguishable in terms of multiple characters and whose intermediates are rare and seemingly unfit in nature. The number and frequency of hybrids is thus reduced to a minimum. The rank of subspecies is employed for groups of forms which are separated by several distinctive morphological characters, but whose intermediates are relatively common in nature. The rank of variety is employed for forms which show only one distinctive morphological character, but have a distinctive ecology and/or distribution. Eight species and a total of 18 infra-specific taxa are recognised and described. Additionally, 14 intraspecific hybrids are briefly described. 13 new combinations are made; Pilosella officinarum ssp. peleteriana (Merat), P. aurantiaca var. blyttiana (Fr.), P. aurantiaca ssp. decolorans (Fr.), P. aurantiaca var. decolorans (Fr.), P. aurantiaca var. pseudoblyttii (Norrl.), P. aurantiaca ssp. dimorpha (Norrl. ex Nageli and Peter), P. cymosa var. pubescens (Lindbl.), P. cymosa ssp. gottlandica (Fr.), P. cymosa var. gottlandica (Fr.), P. cymosa var. parviflora (Fr.), P. cymosa ssp. praealta (Vill. ex Gochnat), P. cymosa var. praealta (Vill. ex Gochnat) and P. cymosa var. bauhinii (Besser). (Less)
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author
organization
alternative title
Förslag till ny taxonomisk indelning av stångfibblorna (Pilosella) i Norden
publishing date
type
Contribution to journal
publication status
published
subject
in
Svensk Botanisk Tidskrift
volume
95
issue
1
pages
39 - 67
publisher
Svenska Botaniska Föreningen
external identifiers
  • scopus:0035077261
ISSN
0039-646X
language
English
LU publication?
yes
id
601bde2b-ee15-40c4-a957-e14e5bc94032 (old id 152977)
date added to LUP
2007-07-02 15:48:40
date last changed
2018-01-14 03:56:33
@article{601bde2b-ee15-40c4-a957-e14e5bc94032,
  abstract     = {An unprejudiced revision of the genus Pilosella (Asteraceae) in the Nordic countries has been attempted. A completely new system for the taxonomy of these mostly facultative apomicts is presented. It is argued that all existing systems are inappropriate in the light of the complicated, and largely unknown, reproductive biology of these taxa. Previous systems have either treated these taxa as obligate apomicts or as ordinary sexual species and in both cases serious conflicts with the nature of the plants have arisen. It is also evident that the existing systems are either too complex or too simplified to be useful in floristic investigations. In the proposed system, the rank of species is employed for groups of forms which are morphologically readily distinguishable in terms of multiple characters and whose intermediates are rare and seemingly unfit in nature. The number and frequency of hybrids is thus reduced to a minimum. The rank of subspecies is employed for groups of forms which are separated by several distinctive morphological characters, but whose intermediates are relatively common in nature. The rank of variety is employed for forms which show only one distinctive morphological character, but have a distinctive ecology and/or distribution. Eight species and a total of 18 infra-specific taxa are recognised and described. Additionally, 14 intraspecific hybrids are briefly described. 13 new combinations are made; Pilosella officinarum ssp. peleteriana (Merat), P. aurantiaca var. blyttiana (Fr.), P. aurantiaca ssp. decolorans (Fr.), P. aurantiaca var. decolorans (Fr.), P. aurantiaca var. pseudoblyttii (Norrl.), P. aurantiaca ssp. dimorpha (Norrl. ex Nageli and Peter), P. cymosa var. pubescens (Lindbl.), P. cymosa ssp. gottlandica (Fr.), P. cymosa var. gottlandica (Fr.), P. cymosa var. parviflora (Fr.), P. cymosa ssp. praealta (Vill. ex Gochnat), P. cymosa var. praealta (Vill. ex Gochnat) and P. cymosa var. bauhinii (Besser).},
  author       = {Tyler, Torbjörn},
  issn         = {0039-646X},
  language     = {eng},
  number       = {1},
  pages        = {39--67},
  publisher    = {Svenska Botaniska Föreningen},
  series       = {Svensk Botanisk Tidskrift},
  title        = {The genus Pilosella in the Nordic countries},
  volume       = {95},
  year         = {2001},
}