Flora of North America species comparison

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Physaria oregona

Oregon twin-pod
Habit Perennials; caudex simple, (cespitose); (silvery) pubescent throughout, trichomes (stalked), few-rayed, rays furcate or imperfectly so, (tuberculate throughout).
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).
Racemes

somewhat loose, (5–15 cm).
Flowers

sepals oblong, 5–7 mm;

petals (lemon yellow), spatulate, 9–12 mm.
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.
Seeds

flattened.
2n

= 8.

Physaria oregona
Phenology Flowering Apr–Jun.
Habitat Gravelly banks, stream shores, rocky slopes, dry hillsides, serpentine soils
Elevation 900-1900 m (3000-6200 ft)
Distribution
from FNA
ID; OR; WA
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 7, p. 655.
Parent taxa Brassicaceae > tribe Physarieae > Physaria
Sibling taxa
P. acutifolia, P. alpestris, P. alpina, P. angustifolia, P. arctica, P. arenosa, P. argyraea, P. arizonica, P. aurea, P. bellii, P. brassicoides, P. calcicola, P. calderi, P. carinata, P. chambersii, P. cinerea, P. condensata, P. congesta, P. cordiformis, P. curvipes, P. densiflora, P. didymocarpa, P. dornii, P. douglasii, P. eburniflora, P. engelmannii, P. eriocarpa, P. fendleri, P. filiformis, P. floribunda, P. fremontii, P. garrettii, P. geyeri, P. globosa, P. gooddingii, P. gordonii, P. gracilis, P. grahamii, P. hemiphysaria, P. hitchcockii, P. humilis, P. integrifolia, P. intermedia, P. kingii, P. klausii, P. lata, P. lepidota, P. lesicii, P. lindheimeri, P. ludoviciana, P. macrocarpa, P. mcvaughiana, P. montana, P. multiceps, P. navajoensis, P. nelsonii, P. newberryi, P. obcordata, P. obdeltata, P. occidentalis, P. ovalifolia, P. pachyphylla, P. pallida, P. parviflora, P. parvula, P. pendula, P. pinetorum, P. prostrata, P. pruinosa, P. pulvinata, P. purpurea, P. pycnantha, P. rectipes, P. recurvata, P. reediana, P. rollinsii, P. saximontana, P. scrotiformis, P. sessilis, P. spatulata, P. subumbellata, P. tenella, P. thamnophila, P. tumulosa, P. valida, P. vicina, P. vitulifera
Synonyms Coulterina oregona, Lesquerella oregona
Name authority S. Watson: Proc. Amer. Acad. Arts 17: 363. (1882)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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