Physaria rollinsii |
Brassicaceae tribe Physarieae |
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Rollins' twinpod |
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Habit | Perennials; (compact); caudex usually simple, (cespitose); (silvery) pubescent throughout, trichomes 6–8-rayed, rays furcate near base, fused at base, (umbonate, strongly tuberculate throughout). | Annuals, biennials, perennials, or subshrubs; eglandular. |
Stems | several from base, decumbent, (unbranched, slender), 0.5–1 dm. |
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Basal leaves | (strongly rosulate); blade usually oblanceolate or broader, sometimes triangular, 2–3.5 cm (width 5–10 mm), margins entire or with 1 or 2 broad teeth, (apex acute). |
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Cauline leaves | blade oblanceolate, 1–1.5 cm (width 2–4 mm), margins entire, (apex acute). |
petiolate, sessile, or subsessile; blade base usually not auriculate (except Paysonia), margins entire, dentate, or sinuate. |
Racemes | congested, (elongated moderately in fruit). |
ebracteate, often elongated in fruit. |
Flowers | sepals linear, 5–7 mm; petals spatulate, 8–10 mm, (apex often somewhat truncate). |
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 | (spreading, straight or somewhat sigmoid), 5–8 mm. |
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Fruits | (erect), didymous, suborbicular, inflated, 2–5(–8) × 4–8(–10)mm, (coriaceous, base slightly cordate or nearly obtuse, sinus obsolete or absent, apical sinus broad and deep); valves (retaining seeds after dehiscence), pubescent, trichomes appressed, (silvery on ovaries and immature fruit); replum obovate to oblong, as wide as or wider than fruit, rarely somewhat constricted basally, apex obtuse; ovules 4 per ovary; style 5–7 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 | slightly flattened. |
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 rollinsii |
Brassicaceae tribe Physarieae |
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Phenology | Flowering May–Jun. | |
Habitat | Sagebrush, granitic talus, open knolls, limestone chiprock, steep slopes, clay banks, near granite boulders | |
Elevation | 2300-2500(-3900) m (7500-8200(-12800) ft) | |
Distribution |
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North America; Mexico; South America; Asia (ne Russia) |
Discussion | Genera 7, species ca. 130 (7 genera, 105 species in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 7, p. 661. | 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: 1663, fig. 2, plate 1, fig. 4. (1966) | B. L. Robinson: in A. Gray et al., Syn. Fl. N. Amer. 1(1,1): 100. (1895) |
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