Physaria alpestris

Suksdorf

W. Amer. Sci. 15: 58. 1906.

Common names: Washington or alpine twinpod
Endemic
Synonyms: Lesquerella alpestris (Suksdorf) G. A. Mulligan
Treatment appears in FNA Volume 7. Treatment on page 624. Mentioned on page 617, 618.
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Perennials; caudex usually simple, rarely branched, (cespitose); (silvery) pubescent throughout, trichomes several-rayed, rays (1- or) 2-bifurcate, (low-umbonate, tubercles relatively few, small). Stems several from base, decumbent to ascending, (unbranched), 0.5–1.5 dm. Basal leaves: (petiole slender); blade obovate, 3–5 cm (width 10–20 mm, base tapering abruptly to petiole), margins entire, (apex rarely slightly acute). Cauline leaves: blade oblanceolate, 0.5–1.5 cm (width 3–5 mm), margins entire. Racemes subcorymbose. Fruiting pedicels (divaricate, straight), 5–10 mm. Flowers: sepals oblong, 8–10 mm; petals spatulate, 12–14 mm. Fruits didymous, mostly highly inflated (strongly flattened at least in 1/2 toward replum), 14–18 × 14–18 mm, (papery, basal sinus slightly notched, apical open, shallow); valves (retaining seeds after dehiscence), evenly pubescent; replum lanceolate, 7–10 mm, width 1.5–2.5 mm, as wide as or wider than fruit, apex acute to acuminate; ovules 8–10 per ovary; style 5–7 mm. Seeds flattened, (2–3 mm). 2n = 48–52, 52, 64, 67–70.


Phenology: Flowering May–Jun.
Habitat: Alpine scree, rocky ridges, talus slopes, volcanic sands and gravel, serpentine gravel, granitic slopes, mountain shrub, subalpine fir, and whitebark pine communities
Elevation: (700-)1300-2400 m

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Physaria alpestris"
Steve L. O’Kane Jr. +
Suksdorf +
Vesicaria sect. Physaria +
Washington or alpine twinpod +
(700-)1300-2400 m +
Alpine scree, rocky ridges, talus slopes, volcanic sands and gravel, serpentine gravel, granitic slopes, mountain shrub, subalpine fir, and whitebark pine communities +
Flowering May–Jun. +
W. Amer. Sci. +
Lesquerella alpestris +
Physaria alpestris +
Physaria +
species +