Physaria bellii |
Brassicaceae tribe Physarieae |
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Bell's or Front Range twinpod, Bell's twinpod, Front Range twinpod |
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Habit | Perennials; caudex simple, (relatively large); densely (silvery) pubescent, trichomes (sessile, appressed), rays furcate, fused at base. | Annuals, biennials, perennials, or subshrubs; eglandular. |
Stems | simple from base, decumbent to nearly prostrate, 0.5–1.3 dm. |
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Basal leaves | (strongly rosulate; shortly petiolate); blade broadly obovate, 1.5–7.5 (width 7.5–26 mm, base gradually tapering to petiole), margins shallowly dentate, (apex obtuse). |
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Cauline leaves | blade oblanceolate to broadly obovate, 1–2.5 cm, margins entire. |
petiolate, sessile, or subsessile; blade base usually not auriculate (except Paysonia), margins entire, dentate, or sinuate. |
Racemes | dense. |
ebracteate, often elongated in fruit. |
Flowers | sepals (pale yellow or yellow-green), narrowly lanceolate to narrowly deltate, 4–8 mm; petals yellow, broadly spatulate to obovate, 9–13 mm, (not clawed). |
actinomorphic; sepals erect, spreading, ascending, or reflexed, lateral pair seldom saccate basally; petals white, yellow, lavender, purple, violet, orange, or brown [pink], claw present, often distinct; filaments unappendaged, not winged; pollen (3 or) 4–11-colpate. |
Fruiting pedicels | (divaricate-ascending to widely spreading, slightly sigmoid to curved), 7–12 mm. |
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Fruits | didymous, slightly flattened (contrary to replum) to uncompressed, 4–9 × 2–8 mm, (strongly coriaceous, apical and basal sinuses narrow, deep); valves (retaining seeds after dehiscence), pubescent, trichomes appressed; replum narrowly oblanceolate to narrowly linear-oblong, as wide as or wider than fruit, apex obtuse; ovules 4 per ovary; style more than 3 mm. |
silicles or siliques, dehiscent, unsegmented, terete, latiseptate, or angustiseptate; ovules 2–100 per ovary; style usually distinct; stigma entire or strongly 2-lobed. |
Seeds | compressed. |
biseriate, uniseriate, or aseriate; cotyledons accumbent or incumbent. |
Trichomes | usually short-stalked, subsessile, or sessile, sometimes long-stalked, stellate, scalelike, subdendritic, or forked, sometimes mixed with simple ones. |
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2n | = 8. |
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Physaria bellii |
Brassicaceae tribe Physarieae |
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Phenology | Flowering Mar–Jun(-Jul). | |
Habitat | Dark shale, road cuts, ridge crests, washes | |
Elevation | 1500-1800 m (4900-5900 ft) | |
Distribution |
CO
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North America; Mexico; South America; Asia (ne Russia) |
Discussion | Of conservation concern. Physaria bellii is often found in shale and limestone soils of the Fountain/Ingleside, Lykins, Niobrara, and Pierre formations. It is in the Center for Plant Conservation’s National Collection of Endangered Plants. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Genera 7, species ca. 130 (7 genera, 105 species in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 7, p. 628. | FNA vol. 7, p. 604. |
Parent taxa | Brassicaceae > tribe Physarieae > Physaria | Brassicaceae |
Sibling taxa | ||
Subordinate taxa | ||
Name authority | G. A. Mulligan: Canad. J. Bot. 44: 1662, fig. 1, plate 1, fig. 3. (1966) | B. L. Robinson: in A. Gray et al., Syn. Fl. N. Amer. 1(1,1): 100. (1895) |
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