Synonyms: Other names: white sweetvetch Nomenclature: sulphurescens = yellow like sulphur Nativity / Invasiveness: Montana native plant
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Description
General: plant height: 30-60 cm tall. Growth habit: erect perennial with several stems from a thick crown and taproot. Stems: usually branched above, greenish, sparsely covered with flat, stiff, very short hairs.
Leaves: alternate, dark green, with 9-21 leaflets, 1-4 cm long, elliptic to oblong, entire, prominently veined, rounded, with small, sharp point at tips and sparsely hairy below. Stipules lance-shaped, brownish-membranous, joined or free, 10-15 mm long.
Flowers: yellowish-white, 14-18 mm long, hanging, 20-100 in tall clusters, often 1-sided. Wings with a slender, ear-shaped lobe almost equal to the claw. Calyx 3-4 mm long, the teeth shorter than the tube, the upper 2 teeth broader and shorter than the lower 3.
June-August.
Fruits: flattened pods, hanging, with 2-4 obovate bumps (loments), 6-10 mm wide, lightly and irregularly net-veined except along the narrowly winged edges. Each loment with 2-4 seeds.
Distribution
Open forested areas, plains to subalpine, in w., c. and s. parts of MT. Also from B.C. and Alberta to WY.
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