Status, distribution, and nomenclature of Northern Quillwort, Isoetes septentrionalis (Isoetaceae) in Canada

Authors

  • Daniel F. Brunton 216 Lincoln Heights Road, Ottawa, Ontario K1A 8A8
  • John McNeill Royal Botanic Garden, Edinburgh, 20A Inverleith Row, Edinburgh, Scotland EH3 5LR

DOI:

https://doi.org/10.22621/cfn.v129i2.1698

Keywords:

Riverbank Quillwort, Northern Quillwort, Isoetes septentrionalis, Isoetes riparia, Isoetes × dodgei, Isoetes canadensis var. robbinsii, Champlain Sea

Abstract

The lycophyte Northern Quillwort (Isoetes septentrionalis D. F. Brunton, sp. nov.) is the northern component of the Riverbank Quillwort (I. riparia) complex. It is locally abundant in southeastern Ontario and southwestern Quebec and is also widely distributed in the northeastern United States. In Canada, it is largely confined to river and lake shores along post-glacial drainage outlets within the limits of the post-glacial Champlain Sea. It is frequently found in association with other Isoetes, especially Dodge’s Quillwort (I. × dodgei A. A. Eaton), its sterile hybrid with Spiny-spored Quillwort (I. echinospora Durieu). The Canadian population of I. septentrionalis appears to be stable. Although first proposed at species level over a century ago, the nomenclature of this taxon has remained unresolved. It is clarified in the present study, in which I. canadensis var. robbinsii is lectotypified.

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Published

2015-08-05

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