Lobelia dortmanna L.

Glabrous aquatic perennial to 1 m, the hollow upright stem usually partly submersed; lvs in a basal rosette, linear, fleshy, hollow, 2–9 cm, outcurved near the tip; cauline lvs minute, filiform; raceme emersed, few-fld; bracts ovate, 2–3 mm; bracteoles none; sep 2 mm; cor pale blue or white, 1–2 cm, the lower lip bearded at base within; 2n=14. Borders of ponds, usually in sand; Nf. to N.J., w. to Minn.; also on the Pacific coast and in Europe. July–Sept.

Shallow water in stony lakes and tarns with acid water.

Can be grown by cuttings or seedlings. Seeds needs stratification.