Physaria alpestris |
Physaria scrotiformis |
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alpine twin-pod, Washington bladder-pod, Washington twin-pod |
silver twinpod, west silver bladderpod |
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Habit | Perennials; caudex usually simple, rarely branched, (cespitose); (silvery) pubescent throughout, trichomes several-rayed, rays (1- or) 2-bifurcate, (low-umbonate, tubercles relatively few, small). | Perennials; (diminutive); caudex simple or branched, (buried, with thatch of persistent leaf bases distally); (appearing silvery gray-green to silvery purple), densely pubescent, trichomes usually 5 or 6 (rarely 7)-rayed, rays bifurcate or incompletely so, (relatively short, stout, umbonate, moderately tuberculate to nearly smooth, lower layer smoother). |
Stems | several from base, decumbent to ascending, (unbranched), 0.5–1.5 dm. |
1–5 from base, prostrate to slightly decumbent, (arising laterally, also erect or ascending from tuft of basal leaves, unbranched, purple-green), 0.08–0.3 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). |
(petiole slightly winged); blade oblanceolate, elliptic, or rhombic, (mostly flat, sometimes somewhat folded), 0.6–2.7 cm, (base tapering to petiole), margins entire, (apex rounded to rounded-acute). |
Cauline leaves | blade oblanceolate, 0.5–1.5 cm (width 3–5 mm), margins entire. |
(3–7, shortly petiolate or sessile); blade elliptic to oblanceolate, 0.3–0.5 cm, margins entire. |
Racemes | subcorymbose. |
crowded, (ca. 3–7 fruits). |
Flowers | sepals oblong, 8–10 mm; petals spatulate, 12–14 mm. |
sepals (greenish yellow), linear-triangular, 3.7–5 mm, (lateral pair subsaccate); petals oblanceolate to narrowly obovate, 4.5–9 mm. |
Fruiting pedicels | (divaricate, straight), 5–10 mm. |
(ascending, straight), 1.8–3.4 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. |
(shortly stipitate, purple or greenish purple in age), slightly didymous, ovoid to obpyriform, 3–5 mm (wider than long, base rounded-obtuse, apex rounded, flattened, or slightly emarginate); valves (inflated, slightly wider than replum), pubescent, trichomes scattered; replum obovate to orbicular-obdeltate, apex rounded, obtuse, or truncate; septum complete or medially small-perforate; ovules 4–6(–8) per ovary; style 2–3.6 mm. |
Seeds | flattened, (2–3 mm). |
relatively plump, (ovate to suborbicular, usually rounded on one side, ± flat or concave on the other, not mucilaginous when wetted). |
2n | = 48–52, 52, 64, 67–70. |
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Physaria alpestris |
Physaria scrotiformis |
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Phenology | Flowering May–Jun. | Flowering Jun-early Jul. |
Habitat | Alpine scree, rocky ridges, talus slopes, volcanic sands and gravel, serpentine gravel, granitic slopes, mountain shrub, subalpine fir, and whitebark pine communities | Tundra areas with islands of Engelmann spruce on Leadville limestone, amidst limestone cobbles and gravel |
Elevation | (700-)1300-2400 m ((2300-)4300-7900 ft) | 3500-3700 m (11500-12100 ft) |
Distribution |
WA
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CO |
Discussion | Physaria scrotiformis is known only from La Plata County. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 7, p. 624. | FNA vol. 7, p. 662. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Lesquerella alpestris | |
Name authority | Suksdorf: W. Amer. Sci. 15: 58. (1906) | O’Kane: Novon 17: 376, fig. 1. (2007) |
Web links |