Physaria rollinsii |
Physaria integrifolia |
|
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Rollins' twinpod |
Snake River or creeping twinpod, Snake River 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). | 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, decumbent, (unbranched, slender), 0.5–1 dm. |
several from base, ± erect, exceeding basal rosette by ± 0.5 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). |
(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, 1–1.5 cm (width 2–4 mm), margins entire, (apex acute). |
blade oblanceolate, 1–2 cm, margin entire, (apex acute). |
Racemes | congested, (elongated moderately in fruit). |
congested, (greatly exceeding leaves). |
Flowers | sepals linear, 5–7 mm; petals spatulate, 8–10 mm, (apex often somewhat truncate). |
sepals often keeled, 6–8 mm; petals spatulate, 8–10 mm. |
Fruiting pedicels | (spreading, straight or somewhat sigmoid), 5–8 mm. |
(spreading, straight or slightly curved), 7–11 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. |
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 | slightly flattened. |
flattened. |
2n | = 8. |
= 16. |
Physaria rollinsii |
Physaria integrifolia |
|
Phenology | Flowering May–Jun. | Flowering (May-)Jun–Jul(-Aug). |
Habitat | Sagebrush, granitic talus, open knolls, limestone chiprock, steep slopes, clay banks, near granite boulders | Calcareous hills and slopes, shale-limestone cliffs, bare steep slopes, red clay banks, shale |
Elevation | 2300-2500(-3900) m (7500-8200(-12800) 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.) |
|
Source | FNA vol. 7, p. 661. | 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 | G. A. Mulligan: Canad. J. Bot. 44: 1663, fig. 2, plate 1, fig. 4. (1966) | (Rollins) Lichvar: Madroño 31: 203. (1984) |
Web links |