Tuberous Indian-plantain (Arnoglossum plantagineum) COSEWIC assessment status report : chapter 11

Summary of Status Report

When the status of vulnerable was assigned by COSEWIC in 1988 (Keddy 1988), tuberous Indian-plantain, Arnoglossum plantagineum Raf. (then known under the name Indian-plantain, Cacalia plantaginea (Raf.) Shinners), was known from four areas: the shoreline fens of Lake Huron along the west side of the Bruce Peninsula, several riverine meadows of the Maitland and Ausable Rivers close to Lake Huron, and a single isolated record near Lake Simcoe. Little has changed since 1988. Additional fieldwork by several people has located new populations, and counts by the author in 1998 have yielded higher numbers of flowering plants for many sites. Some of the apparent increase in plant numbers may be due to weather conditions in 1998 being more favourable for tuberous Indian-plantain to flower than was the case in 1988. Cottage development and lawn mowing are an ongoing threat along the Lake Huron shoreline.

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