This is a rhizomatous perennial[3] growing 20 centimetres (7.9 in) to well over 1 meter (3.3 ft) tall, its 4-angled stem usually erect.

[4] The oppositely arranged leaves are lance-shaped to oblong, up to 8 centimetres (3.1 in) long, usually clasping the stem.

[3] The flower is 1–3 inches (2.5–7.6 cm) long,[3] its tubular base encapsulated in a ribbed calyx of sepals with pointed lobes.

It is known from Quebec, it has been reported in Vermont, and there are a few occurrences in Maine, where it grows only in freshwater sections of tidal estuaries.

[4] This plant variety faces several threats, but its current status is not known due to a lack of data.