Lindernia dubia false pimpernel Scrophulariaceae LIDU; Bx, sf; Q, cu (Greller 1977); R, bk, mls, t;


Lindernia dubia.Peter M.

Lindernia dubia.Peter M. (Accessed 2/2015).

Lindernia dubia is an annual herb, 5- 20 cm tall, branching, stem often 4-sided. 

Leaves opposite, to 3 cm long, oblong to elliptic, stalkless, tip blunt, base rounded, margin entire to remotely toothed. 

Flowers pale bluish, bilaterally symmetrical, 0.5-1cm long, 2-lipped, upper lip 2-lobed, much narrower than 3-lobed lower lip, sepals narrow, 0.3-0.4 cm, fused at base, late season flowers often closed, self-pollinating, flowers in leaf axils, stalks shorter than leaves, open flowers visited by Halictid bees and other small bees, also by skippers and other small butterflies (Hilty 2006). 

Fruit dry, a narrow, asymmetric capsule 0.4-0.6 cm long, with persistent style, ca 0.2 cm long (Radford et al. 1968), sitting amid old calyx lobes, splitting in two to release seeds; blooms and fruits June-Oct. 

Wetland status: OBL. 

Lindernia dubia.2006 © Peter M.

Lindernia dubia.2006 © Peter M. (Accessed 7/2014).

Frequency in NYC: Infrequent. 

Origin: Native. 

Habitat: Open, disturbed wet roadsides, curbs, marshes or pond shores.