Physaria rollinsii |
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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). |
Stems | several from base, decumbent, (unbranched, slender), 0.5–1 dm. |
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). |
Cauline leaves | blade oblanceolate, 1–1.5 cm (width 2–4 mm), margins entire, (apex acute). |
Racemes | congested, (elongated moderately in fruit). |
Flowers | sepals linear, 5–7 mm; petals spatulate, 8–10 mm, (apex often somewhat truncate). |
Fruiting pedicels | (spreading, straight or somewhat sigmoid), 5–8 mm. |
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. |
Seeds | slightly flattened. |
2n | = 8. |
Physaria rollinsii |
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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 |
CO
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Source | FNA vol. 7, p. 661. |
Parent taxa | Brassicaceae > tribe Physarieae > Physaria |
Sibling taxa | |
Name authority | G. A. Mulligan: Canad. J. Bot. 44: 1663, fig. 2, plate 1, fig. 4. (1966) |
Web links |