Physaria vitulifera |
Physaria newberryi |
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roundtip twinpod |
Newberry twinpod, Newberry's twinpod |
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Habit | Perennials; caudex simple or branched, (cespitose); (silvery) pubescent throughout, trichomes several-rayed, rays furcate or bifurcate, (relatively massive, smooth to few-tubercled). | Perennials; caudex simple or branched, (branches often covered with persistent leaf bases, cespitose); densely (silvery) pubescent, trichomes rays fused at least 1/2 their length. | ||||
Stems | several from base, usually decumbent to ascending, (arising laterally, unbranched, coarse), 1–2 dm. |
several from base, ascending to erect (arising laterally, unbranched), 0.5–1(–2.5) dm. |
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Basal leaves | blade pandurate or obovate, 3–6 cm, margins usually deeply and broadly incised, rarely subentire, (apex obtuse). |
(ascending to erect, petiole slender); blade oblanceolate to obovate, 3–8 cm, (base tapering to petiole), margins incised or dentate with broad teeth, (apex acute to obtuse). |
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Cauline leaves | blade oblanceolate to spatulate, similar to basal, (3–6 mm wide), margins entire, (apex often somewhat acute). |
blade linear-oblanceolate to oblanceolate, 1–2 cm, margins entire. |
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Racemes | congested, (elongated in fruit). |
dense (elongated or not in fruit, 2.5–8.5(–10) cm). |
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Flowers | sepals oblong, 6–8 mm; petals spatulate, to 10 mm. |
sepals (greenish yellow), lanceolate, 6–8.5 mm, (saccate and cucullate); petals spatulate to narrowly oblanceolate, 7–10(–12) mm. |
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Fruiting pedicels | (usually curving upward, sigmoid), 6–10 mm. |
(divaricate, straight), 5–11(–15) mm, (rigid, fruits not pendent on arching pedicels). |
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Fruits | didymous, irregular in shape, somewhat angular, inflated, 5–7 × 6–8 mm, (papery, often rigid, base obtuse or truncate, apical sinus broad, open and deep); valves (retaining seeds after dehiscence), pubescent, trichomes spreading, loose; replum oblong, often constricted, as wide as or wider than fruit, apex obtuse; ovules 4 per ovary; style 5–7 mm. |
didymous, sides curved and angular, highly inflated, 6–16 × 8–12 mm, (papery, apical sinus broad and concave); valves (retaining seeds after dehiscence, distinctly 2-keeled on side away from replum), pubescent, trichomes appressed; replum linear to linear-lanceolate, as wide as or wider than fruit, apex acute; ovules 4–8 per ovary; style 2–9 mm, (usually not exceeding sinus). |
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Seeds | flattened. |
slightly flattened, (ovate). |
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2n | = 8, 16. |
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Physaria vitulifera |
Physaria newberryi |
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Phenology | Flowering Apr–Jun. | |||||
Habitat | Rocky hillsides, dry banks, gravel and sand, granitic slopes, soil scree, red shale | |||||
Elevation | 1600-3000 m (5200-9800 ft) | |||||
Distribution |
CO
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AZ; NM; NV; UT
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Discussion | Subspecies 2 (2 in the flora). Physaria newberryi, with its unusual fruits, can be confused with 15. P. chambersii. In P. chambersii, the sides of the fruit are flat, the style always exceeds the top, or shoulders, of the fruit, and shoulders form an angle that does not curve in toward the style. In P. newberryi, the sides of the fruit are concave, the styles are shorter than shoulders of the silicle (except in subsp. yesicola), and shoulders of the silicle form a curved, inward arching crown on the fruit. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 7, p. 665. | FNA vol. 7, p. 652. | ||||
Parent taxa | Brassicaceae > tribe Physarieae > Physaria | Brassicaceae > tribe Physarieae > Physaria | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | P. didymocarpa var. newberryi | |||||
Name authority | Rydberg: Bull. Torrey Bot. Club 28: 278. (1901) | A. Gray: in J. C. Ives, Rep. Colorado R. 4: 6. (1861) | ||||
Web links |