Physaria ovalifolia |
Physaria scrotiformis |
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roundleaf bladderpod |
silver twinpod, west silver bladderpod |
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Habit | Perennials; caudex simple or branched, (thickened by persistent leaf bases); densely pubescent (foliage usually scabrous), trichomes (sessile or short-stalked), several-rayed, rays furcate near base, (usually strongly umbonate, roughly tuberculate, less so over umbo). | 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 | few to several from base, erect or outer decumbent, 0.5–2.5 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. |
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Basal leaves | blade suborbicular to elliptic or ovate or deltate, 0.5–2(–6.5) cm, margins entire or shallowly dentate. |
(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). |
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Cauline leaves | (proximal shortly petiolate, distal usually sessile); blade narrowly elliptic or obovate, (0.5–)1–2.5(–4) cm, margins entire. |
(3–7, shortly petiolate or sessile); blade elliptic to oblanceolate, 0.3–0.5 cm, margins entire. |
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Racemes | compact, (± subumbellate to densely corymbiform, elongated or not). |
crowded, (ca. 3–7 fruits). |
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Flowers | sepals ± elliptic, 4.5–7(–8.5) mm, (median pair thickened apically); petals (sometimes white), suborbicular to obovate or obdeltate, 6.5–15 mm, (base narrowing to broad claw, apex sometimes emarginated). |
sepals (greenish yellow), linear-triangular, 3.7–5 mm, (lateral pair subsaccate); petals oblanceolate to narrowly obovate, 4.5–9 mm. |
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Fruiting pedicels | (usually spreading at right angles, sometimes nearly erect, ± straight), 5–15(–20) mm, (stout). |
(ascending, straight), 1.8–3.4 mm. |
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Fruits | (sessile or shortly stipitate, less than 1 mm), subglobose to broadly ellipsoid, inflated or slightly compressed (terete or subterete), (4–)5–8(–9) mm; valves (not retaining seeds after dehiscence), glabrous; replum as wide as or wider than fruit; ovules 8–16 per ovary; style 4–8(–9) 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. |
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Seeds | flattened. |
relatively plump, (ovate to suborbicular, usually rounded on one side, ± flat or concave on the other, not mucilaginous when wetted). |
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Physaria ovalifolia |
Physaria scrotiformis |
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Phenology | Flowering Jun-early Jul. | |||||
Habitat | Tundra areas with islands of Engelmann spruce on Leadville limestone, amidst limestone cobbles and gravel | |||||
Elevation | 3500-3700 m (11500-12100 ft) | |||||
Distribution |
CO; KS; NE; NM; OK; TX
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CO |
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Discussion | Subspecies 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Physaria scrotiformis is known only from La Plata County. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 7, p. 655. | FNA vol. 7, p. 662. | ||||
Parent taxa | Brassicaceae > tribe Physarieae > Physaria | Brassicaceae > tribe Physarieae > Physaria | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Lesquerella ovalifolia, Lesquerella engelmannii subsp. ovalifolia | |||||
Name authority | (Rydberg) O’Kane & Al-Shehbaz: Novon 12: 326. (2002) | O’Kane: Novon 17: 376, fig. 1. (2007) | ||||
Web links |