Physaria oregona |
Physaria integrifolia |
|
---|---|---|
Oregon twin-pod |
Snake River or creeping twinpod, Snake River twinpod |
|
Habit | Perennials; caudex simple, (cespitose); (silvery) pubescent throughout, trichomes (stalked), few-rayed, rays furcate or imperfectly so, (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, erect or somewhat decumbent, (unbranched), 1–3.5 dm. |
several from base, ± erect, exceeding basal rosette by ± 0.5 dm. |
Basal leaves | (petiole slender, usually incised or with broad teeth along petiole); blade obovate, 4–6 cm, margins entire. |
(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 or broader, 1.5–2.5 cm, margins entire or sparsely dentate, (apex acute). |
blade oblanceolate, 1–2 cm, margin entire, (apex acute). |
Racemes | somewhat loose, (5–15 cm). |
congested, (greatly exceeding leaves). |
Flowers | sepals oblong, 5–7 mm; petals (lemon yellow), spatulate, 9–12 mm. |
sepals often keeled, 6–8 mm; petals spatulate, 8–10 mm. |
Fruiting pedicels | (spreading or ascending, curved, fruits not pendent), 10–20 mm. |
(spreading, straight or slightly curved), 7–11 mm. |
Fruits | didymous, obreniform, moderately inflated, angustispetate, (8–)10–12(–15) × 10–14(–16) mm, (papery, not keeled, basal sinus absent, apical sinus broad and open); valves (retaining seeds after dehiscence, rounded or irregular), loosely pubescent, trichomes spreading; replum broadly lanceolate, as wide as or wider than fruit, apex acute; ovules 8 per ovary; style 1–2 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. |
Physaria oregona |
Physaria integrifolia |
|
Phenology | Flowering Apr–Jun. | Flowering (May-)Jun–Jul(-Aug). |
Habitat | Gravelly banks, stream shores, rocky slopes, dry hillsides, serpentine soils | Calcareous hills and slopes, shale-limestone cliffs, bare steep slopes, red clay banks, shale |
Elevation | 900-1900 m (3000-6200 ft) | 1900-2700 m (6200-8900 ft) |
Distribution |
ID; OR; WA
|
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. 655. | FNA vol. 7, p. 644. |
Parent taxa | Brassicaceae > tribe Physarieae > Physaria | Brassicaceae > tribe Physarieae > Physaria |
Sibling taxa | ||
Synonyms | Coulterina oregona, Lesquerella oregona | P. didymocarpa var. integrifolia, P. integrifolia var. monticola |
Name authority | S. Watson: Proc. Amer. Acad. Arts 17: 363. (1882) | (Rollins) Lichvar: Madroño 31: 203. (1984) |
Web links |