Pinguicula vulgaris L.
Habitat: Wet, circumneutral rocks and ledges in subalpine areas. [Rocky summits and outcrops (non-forested, upland)]
Range: Labrador to Alaska, south to northern New England, New York, Michigan, Minnesota, and Oregon.
Aids to Identification: The violet, spurred, and 5-lobed flower of common butterwort combined with the basal rosette of 3-6 shiny, sticky leaves with rolled-in edges makes this species easily identifiable.
Ecological characteristics: Common butterwort is one of several species of plants in Maine that grow in nutrient poor habitats and rely upon insects as a supplemental nutrient source. Tiny insects are entrapped on the sticky surface of the butterwort leaves where they are then digested.
Phenology: Flowers June - July.
Synonyms: Represented in Maine and New England by ssp. vulgaris. No synonyms noted.
Known Distribution in Maine: This rare plant has been documented from a total of 1 town(s) in the following county(ies): Franklin.
Reason(s) for rarity: At southern limit of range.
Conservation considerations: The single known population is not large, but is in a remote location where it is not particularly vulnerable to human acitivities.