Hedysarum sulphurescens
sulfur sweetvetch, sulphur hedysarum, sulphur sweet-vetch, white sweetvetch, yellow hedysarum, yellow sweet-vetch
ascending to erect, 1–6(–9) dm.
(3–)7–12 cm;
stipules 8–15 mm;
leaflets (5–)9–17, blades elliptic or lanceolate-oblong, 9–40 × 4.5–15(–21) mm, veins conspicuous, surfaces strigose abaxially, glabrous adaxially.
(6–)10–60-flowered, axis 2.5–22 cm in fruit;
bracts 2–6 mm.
4.5–16 cm.
1–3.5(–4) mm.
usually declined at anthesis;
calyx 3–6 mm;
tube 1.5–4 mm, puberulent;
lobes triangular to subulate, 1–2.5(–3) mm, equal or nearly so;
corolla yellow to pale yellow, 14–20 mm;
wing auricles connate, linear, nearly equal or equal to claw.
segments 1–4, 7–13 × 5.5–9 mm, margins conspicuously winged, prominently reticulate, glabrous.
Hedysarum sulphurescens
Hedysarum sulphurescens is a near ally of H. occidentale, with which it shares a large portion of its range, and from which it differs mainly in flower color. The two taxa are apparently partitioned by subtle habitat differences and seldom occur closely juxtaposed. The morphological differences, though small and of little consequence in other plant groups, seem to support evolutionary processes that keep them separate.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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WA
Flora NW
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