Justicia americana water-willow Acanthaceae JUAM; R (DeCandido 2001);

  

Justicia americana. Kay Yatskievych.www.discoverlife.org

Justicia americana. Kay Yatskievych.www.discoverlife.org. (Accessed 4/2014).

Justicia americana is a perennial herb, colonial from rhizomes, stems 50-100 cm tall, mostly unbranched, rooting at lower nodes. 

Leaves opposite, 8-16 cm long, 0.8-2.5 cm wide, linear to lance-shaped, pointed at both ends. 

Flowers pale violet to white with purple markings on lower lip, bilaterally symmetrical, tubular, about 1 cm long, 2- lipped, lips about as long as tube, asymmetric, lower lip 3-lobed; inflorescence of crowded in head-like clusters 1-3 cm long, on stalks 5-15 cm long; blooms June-Aug. 

Fruit a dry capsule, seeds 0.3 cm, rough. 

Wetland status: OBL. 

Frequency in NYC: Very infrequent. 

Origin: Native. 

Habitat: Muddy soil, pH 5.4-7.6, shallow water of rivers and lakes, shade tolerant (USDA, NRCS 2006).