Physaria vitulifera |
Physaria integrifolia |
|
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roundtip twinpod |
Snake River or creeping twinpod, Snake River 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 usually branched, (rhizomelike, cespitose); densely (silvery) pubescent, trichomes (often stalked, appressed), several-rayed, rays furcate or bifurcate, (umbonate, strongly tuberculate throughout). |
Stems | several from base, usually decumbent to ascending, (arising laterally, unbranched, coarse), 1–2 dm. |
several from base, ± erect, exceeding basal rosette by ± 0.5 dm. |
Basal leaves | blade pandurate or obovate, 3–6 cm, margins usually deeply and broadly incised, rarely subentire, (apex obtuse). |
(forming a strong rosette; long-petiolate); blade oblanceolate to ovate or orbicular, (1.5–)2–4(–8) cm, (base usually abruptly tapering to petiole), margins entire. |
Cauline leaves | blade oblanceolate to spatulate, similar to basal, (3–6 mm wide), margins entire, (apex often somewhat acute). |
blade oblanceolate, 1–2 cm, margin entire, (apex acute). |
Racemes | congested, (elongated in fruit). |
congested, (greatly exceeding leaves). |
Flowers | sepals oblong, 6–8 mm; petals spatulate, to 10 mm. |
sepals often keeled, 6–8 mm; petals spatulate, 8–10 mm. |
Fruiting pedicels | (usually curving upward, sigmoid), 6–10 mm. |
(spreading, straight or slightly curved), 7–11 mm. |
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, highly inflated, 8–22 × 10–25 mm, (papery, basal and apical sinuses deep); valves (retaining seeds after dehiscence), densely pubescent, trichomes appressed; replum linear to oblong, as wide as or wider than fruit; ovules 8 per ovary; style 7–9 mm. |
Seeds | flattened. |
flattened. |
2n | = 8, 16. |
= 16. |
Physaria vitulifera |
Physaria integrifolia |
|
Phenology | Flowering Apr–Jun. | Flowering (May-)Jun–Jul(-Aug). |
Habitat | Rocky hillsides, dry banks, gravel and sand, granitic slopes, soil scree, red shale | Calcareous hills and slopes, shale-limestone cliffs, bare steep slopes, red clay banks, shale |
Elevation | 1600-3000 m (5200-9800 ft) | 1900-2700 m (6200-8900 ft) |
Distribution |
CO
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ID; MT; WY |
Discussion | Physaria integrifolia has traditionally been recognized as a variety of P. didymocarpa, but it is morphologically and ecologically quite distinctive. Variety monticola (no combination has been made at subspecific rank) is not recognized here; it is considered another example, in the genus, of caudices elongating in response to shifting substrates. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 7, p. 665. | FNA vol. 7, p. 644. |
Parent taxa | Brassicaceae > tribe Physarieae > Physaria | Brassicaceae > tribe Physarieae > Physaria |
Sibling taxa | ||
Synonyms | P. didymocarpa var. integrifolia, P. integrifolia var. monticola | |
Name authority | Rydberg: Bull. Torrey Bot. Club 28: 278. (1901) | (Rollins) Lichvar: Madroño 31: 203. (1984) |
Web links |