Draba yukonensis
Publ. Bot. (Ottawa) 4: 37, plate 7. 1975.
Perennials; (short-lived); caudex simple or branched (with persistent leaf remains); not scapose. Stems branched, 0.4–2 dm, pubescent throughout, trichomes simple, 0.3–1.2 mm, and 2–6-rayed, 0.05–0.6 mm. Basal leaves rosulate; subsessile; blade oblanceolate to narrowly so, 0.3–1 cm × 0.5–2 mm, margins entire, (ciliate, trichomes simple, to 1.3 mm), surfaces pubescent, abaxially with (rigid), simple and 2-rayed trichomes, 0.4–1.2 mm, sometimes with short-stalked, 3–6-rayed ones, 0.1–0.3 mm, adaxially with simple trichomes. Cauline leaves 1–3; sessile; blade ovate to oblong, margins entire, surfaces pubescent as basal. Racemes 5–20-flowered, ebracteate, considerably elongated in fruit; rachis not flexuous, pubescent as stem. Fruiting pedicels erect to ascending, straight, 0.5–3 mm, pubescent as stem. Flowers: sepals ovate, 1.2–1.6 mm, pubescent, (trichomes simple and 2–4-rayed); petals white, spatulate, 1.5–2 × 0.7–0.8 mm; anthers ovate, ca. 0.2 mm. Fruits ovoid to oblong, plane, not flattened, 2–5 × 1.5–2 mm; valves pubescent, trichomes short-stalked, 4- or 5-rayed, 0.05–0.3 mm; ovules 36–52 per ovary; style 0.1–0.3 mm. Seeds oblong, 0.6–0.8 × 0.3–0.4 mm.
Phenology: Flowering late May–Jun.
Habitat: Open stony ridges on ancient beach in grassy areas and aspen stands
Elevation: ca. 600 m
Discussion
Of conservation concern.
Draba yukonensis is known only from Kluane National Park, southwestern Yukon Territory.
Selected References
None.