Physaria oregona |
Brassicaceae tribe Physarieae |
|
---|---|---|
Oregon twin-pod |
|
|
Habit | Perennials; caudex simple, (cespitose); (silvery) pubescent throughout, trichomes (stalked), few-rayed, rays furcate or imperfectly so, (tuberculate throughout). | Annuals, biennials, perennials, or subshrubs; eglandular. |
Stems | several from base, erect or somewhat decumbent, (unbranched), 1–3.5 dm. |
|
Basal leaves | (petiole slender, usually incised or with broad teeth along petiole); blade obovate, 4–6 cm, margins entire. |
|
Cauline leaves | blade oblanceolate or broader, 1.5–2.5 cm, margins entire or sparsely dentate, (apex acute). |
petiolate, sessile, or subsessile; blade base usually not auriculate (except Paysonia), margins entire, dentate, or sinuate. |
Racemes | somewhat loose, (5–15 cm). |
ebracteate, often elongated in fruit. |
Flowers | sepals oblong, 5–7 mm; petals (lemon yellow), spatulate, 9–12 mm. |
actinomorphic; sepals erect, spreading, ascending, or reflexed, lateral pair seldom saccate basally; petals white, yellow, lavender, purple, violet, orange, or brown [pink], claw present, often distinct; filaments unappendaged, not winged; pollen (3 or) 4–11-colpate. |
Fruiting pedicels | (spreading or ascending, curved, fruits not pendent), 10–20 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. |
silicles or siliques, dehiscent, unsegmented, terete, latiseptate, or angustiseptate; ovules 2–100 per ovary; style usually distinct; stigma entire or strongly 2-lobed. |
Seeds | flattened. |
biseriate, uniseriate, or aseriate; cotyledons accumbent or incumbent. |
Trichomes | usually short-stalked, subsessile, or sessile, sometimes long-stalked, stellate, scalelike, subdendritic, or forked, sometimes mixed with simple ones. |
|
2n | = 8. |
|
Physaria oregona |
Brassicaceae tribe Physarieae |
|
Phenology | Flowering Apr–Jun. | |
Habitat | Gravelly banks, stream shores, rocky slopes, dry hillsides, serpentine soils | |
Elevation | 900-1900 m (3000-6200 ft) | |
Distribution |
ID; OR; WA
|
North America; Mexico; South America; Asia (ne Russia) |
Discussion | Genera 7, species ca. 130 (7 genera, 105 species in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 7, p. 655. | FNA vol. 7, p. 604. |
Parent taxa | Brassicaceae > tribe Physarieae > Physaria | Brassicaceae |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | Coulterina oregona, Lesquerella oregona | |
Name authority | S. Watson: Proc. Amer. Acad. Arts 17: 363. (1882) | B. L. Robinson: in A. Gray et al., Syn. Fl. N. Amer. 1(1,1): 100. (1895) |
Web links |