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The genus Pilosella in the Nordic countries

Förslag till ny taxonomisk indelning av stångfibblorna (Pilosella) i Norden

In English

Författare

Summary, in English

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).

Publiceringsår

2001

Språk

Engelska

Sidor

39-67

Publikation/Tidskrift/Serie

Svensk Botanisk Tidskrift

Volym

95

Issue

1

Dokumenttyp

Artikel i tidskrift

Förlag

Svenska Botaniska Föreningen

Ämne

  • Ecology

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0039-646X