Enum. Pl., suppl., 45. 1814.
Perennials; (stoloniferous, with vegetative rosettes, loosely cespitose to somewhat pulvinate); sparsely to moderately pubescent, trichomes stalked, cruciform, stellate, mixed with simple and forked-stalked ones. Stems several to many from base, erect, ascending to decumbent, branched (several), 1.5–3.5 (–5) dm. Basal leaves: petiole 0–1 cm; blade spatulate, oblanceolate, oblong, or obovate, 2–5.5 (–8) cm × 9–18 (–25) mm, margins dentate to denticulate, apex obtuse or acute, surfaces usually pubescent, rarely subglabrate, trichomes stellate with some rays branched. Cauline leaves 4–8; blade oblong or ovate, 1–5 cm × 5–20 mm, base subcordate or auriculate, margins usually dentate, rarely subentire, apex acute or obtuse. Racemes simple, (lax). Fruiting pedicels ascending to divaricate, 7–17 (–20) mm. Flowers: sepals oblong, 4.5–8 × 1–2 mm, lateral pair conspicuously saccate basally; petals white, spatulate to obovate, 10–19 × 4–8 mm, apex obtuse; filaments 4–7 mm; anthers oblong, 0.7–1.2 mm. Fruits ascending to spreading, torulose, (3–) 4–7 cm × 1–2 mm; valves each with midvein absent or obscure, along proximal 1/2; ovules 40–60 per ovary; style 0.5–1 mm. Seeds narrowly winged throughout, ovate, 1–1.4 × 0.9–1.1 mm; wing 0.1–0.2 mm wide. 2n = 16.
Phenology: Flowering Jun–Aug.
Habitat: Rare garden escape
Introduced; B.C., N.B., Ont., Que., Yukon, Mich., N.Y., sw Asia
"elongated" is not a number."thick" is not a number."dm" is not declared as a valid unit of measurement for this property.