Nasturtium bursifolium de Candolle, Syst. Nat. 2: 194. 1821; Arabidopsis bursifolia (de Candolle) Botschantzev; Beringia bursifolia (de Candolle) R. A. Price, Al-Shehbaz & O’Kane

Plants densely hirsute basally, trichomes primarily simple, to 1 mm, these often mixed with smaller, forked, and/or dendritic ones, glabrescent or sparsely pubescent distally. Stems simple or few to several from caudex, (0.5-)1-4.5(-6.5) dm. Basal leaves: petiole 0.3-3 cm, flattened at base, ciliate; blade oblanceolate to obovate, or linear-lanceolate, (0.5-)1.2-6.5(-10) cm × (2-)3-8(-17) mm, base cuneate to attenuate, apex obtuse to subacute, surfaces pubescent, trichomes usually branched. Cauline leaves: blade lanceolate to linear-lanceolate or oblong, (0.5-)1-3(-4.2) cm × (1-)2.5-7(-10) mm, base strongly sagittate. Fruiting pedicels not appressed to rachis, straight, (3-)5-14(-18) mm, glabrous. Flowers: sepals 1.2-2.5 × 0.6-1 mm, sparsely to densely pubescent; petals (2.5-)3-4(-4.5) × (0.8-)1-1.5 mm; filaments 2-2.5 mm; anthers 0.4-0.5 mm. Fruits (1.5-)2-3.3(-4) cm × (0.7-)1-1.5(-2) mm; style slender, 0.2-0.8(-1) mm. Seeds 0.8-1 × 0.4-0.5 mm.

Subspecies 2 (2 in the flora): n, w North America, e Asia (Russian Far East).

Lower Taxa

• Transberingia bursifolia subsp. bursifolia
• Transberingia bursifolia subsp. virgata (Nuttall) Al-Shehbaz & O’Kane