Transberingia bursifolia
Novon 13: 396. 2003.
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.
Distribution
Alta., N.W.T., Nunavut, Sask., Yukon, Alaska, Calif., Colo., Idaho, Mont., Nev., Utah, Wyo., e Asia (Russian Far East)
Discussion
Subspecies 2 (2 in the flora).
R. C. Rollins (1993) treated subspp. bursifolia and virgata as distinct species of Halimolobos, but the alleged differences (stems branched basally versus distally, plants cespitose versus non-cespitose, fruits slightly compressed versus terete) do not hold, and the only reliable difference between the two taxa is in the type of trichomes. Therefore, a subspecific, rather than specific, rank is adopted here.
Selected References
None.
Key
| 1 | Plants glabrous or sparsely pubescent on stems distally and on rachises, trichomes simple, spreading. | Transberingia bursifolia subsp. bursifolia |
| 1 | Plants usually pubescent, rarely glabrescent, on stems distally and on rachises, trichomes branched, subappressed, these sometimes mixed with simple ones. | Transberingia bursifolia subsp. virgata |
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