Leonurus cardiaca motherwort Lamiaceae LECA*; Bx, bs, pb, sm, wv (Yost et al. 1991); Q, a; K, p; R, c;

   

Leonurus cardiaca.K. Chayka.minnesotawildflowers.info

Leonurus cardiaca.© 2006 K. Chayka.minnesotawildflowers.info. (Accessed 4/2014).

Leonurus cardiaca is a perennial herb, colonial from rhizomes with fibrous roots, stems to 1.5 m tall, from an overwintering basal rosette (Levine 1995; Yatskievych 2006); stems, stout, erect, branched, ribbed or strongly angled, usually clustered. 

Leaves opposite, stalks to 13 cm long, blade to 15 cm long, 12 cm wide, deeply 3-lobed and toothed, lobe tips pointed, surface hairy, dull dark green, puckered from impressed veins, veins palmate at base, secondary veins netted, lower leaves broadly heart-shaped, progressively smaller and narrowed upward. 

Flowers pale purple with darker spots, tubular, bilaterally symmetrical, densely hairy outside, tube to 0.6 cm long, 0.2 cm wide, petal lobes deeply 2-lipped, upper lip 0.5-0.6 cm long, lower lip small, 3-lobed, to 0.2 cm long, calyx bilaterally symmetrical with 5 sharp lobes, becoming tan, stiff and spine-tipped in fruit (Yatskievych 2006); inflorescences of dense clusters ringing stem at nodes, stems often persisting into winter; blooms June-Aug. 

Fruit dry, 4-nutlets. 

Wetland status: UPL. 

Frequency in NYC: Infrequent. 

Origin: Asia. 

Habitat: Open areas. 

Notes: Used as an herbal medicinal.