Aquatic and Wetland Vascular Plants of the Northern Great Plains
45. Scrophulariaceae, the Figwort Family
6. Lindernia All. -- False pimpernel1. Lindernia dubia (L.) Pennell
Small, usually widely branched annual 0.5-2 dm tall, similar to Gratiola neglecta in overall appearance and sometimes confused with it. Leaves simple, opposite, sessile, ovate to elliptic or obovate, 5-30 mm long, 2-10 mm wide, entire to denticulate, narrowed to rounded or cordate at the base. Flowers borne singly in the axils of the leaves, on slender pedicels 0.5-2.5 cm long; calyx regular, comprised of 5 distinct, linear to linear-lanceolate sepals 3-5 mm long; corolla light blue-violet, tubular-campanulate, 4-10 mm long, bilabiate, the upper lip erect, shallowly 2-lobed, the lower lip somewhat deflexed, shallowly 3-lobed, much wider than the upper lip; stamens 2, with a lower pair of filament-like staminodes also present, these inserted at the middle of the corolla tube. Capsule ovoid to ellipsoid, 3.5-6 mm long, membranous. Aug--Sep. Mud flats and shores of temporary ponds and marshes; rare in se ND to occasional in e and c NE; (NH and Que. to ND, s to FL and TX; also on the Pacific Coast, s to S.Amer.). Including L. anagallidea (Michx.) Pennell.
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