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A study of Draba cacuminum (Brassicaceae)
Author(s) -
Elven Reidar,
Aarhus Aasne
Publication year - 1984
Publication title -
nordic journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.333
H-Index - 33
eISSN - 1756-1051
pISSN - 0107-055X
DOI - 10.1111/j.1756-1051.1984.tb02042.x
Subject(s) - subspecies , biology , herbarium , brassicaceae , phytogeography , ecology , population , botany , zoology , demography , sociology , taxon
A morphological analysis of the Scandinavian mountain endemic Draba cacuminum Elis. Ekman is presented, based on Scandinavian herbarium collections and a population sample from the Finse area, S Norway. It is compared with supposedly close relatives, especially D. norvegica Gunnerus, and is found to be a distinct species with infraspecies variation at two levels. The populations of southern and northern Scandinavia have been separated as subspecies, ssp. cacuminum and ssp. angusticarpa Elven ssp. nov., respectively, and there is also variation within the southern subspecies. A lectotype has been chosen for D. cacuminum , a revised distribution map is presented, and the ecology and phytogeography of the species is discussed. It seems to be a weak competitor, and its present very discontinuous area is assumed to be a remnant of one continuous or more probably two areas (in S Norway and N Scandinavia) in the late Weichselian.