A taxonomic and phytogeographical review of some arctic and alpine Senecio species

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Abstract
A review is presented of the taxonomy of four arctic and (or) alpine species of Senecio, S. conterminus Greenman, S. hyperborealis Greenman, S. resedifolius Less., and S. cymbalarioides Buek. Of these, the first three have been recently claimed by one authority or another to have disjunct distributions between the Alaska–Yukon area and the Rocky Mountains. Investigations based on morphology (including that of the pollen) and cytology confirm the recognition of the four species and have furnished clear evidence for the recognition of a new species, S. ogotorukensis Packer, a description of which is provided. It is concluded from the author's understanding of the taxonomy of these species that none has a disjunct distribution between the Alaska–Yukon area and the Rocky Mountains.

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