[Taxacom] Help needed with plant ID (Brooklyn, NY)

[Dilrukshan Wijesinghe]

I would appreciate help in identifying a small inconspicuous herbaceous plant occasionally found growing in sidewalk/pavement cracks here in Brooklyn, New York. It appears to have opposite lobed leaves and an irregular white-mauve flower, the latter with a pair of yellow spots on the lower "lip". It is found growing in places preferred by Sagina procumbens (Birdseye Pearlwort) - i.e. pavement cracks with rather rich soil not subject to drying. I have considered all the likely families and genera in this area with irregular flowers but nothing seems to match.

Please see the five most recent photos in my (Elaphrornis) Flickr Photostream:

https://www.flickr.com/photos/23177312 at N06

Thanks in advance for any help.

Priyantha
D. P. Wijesinghe
dpwijesinghe at yahoo.com