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alpine twin-pod, Washington bladder-pod, Washington twin-pod

Habit Perennials; caudex usually simple, rarely branched, (cespitose); (silvery) pubescent throughout, trichomes several-rayed, rays (1- or) 2-bifurcate, (low-umbonate, tubercles relatively few, small).
Stems

several from base, decumbent to ascending, (unbranched), 0.5–1.5 dm.

Basal leaves

(petiole slender);

blade obovate, 3–5 cm (width 10–20 mm, base tapering abruptly to petiole), margins entire, (apex rarely slightly acute).

Cauline leaves

blade oblanceolate, 0.5–1.5 cm (width 3–5 mm), margins entire.

Racemes

subcorymbose.

Flowers

sepals oblong, 8–10 mm;

petals spatulate, 12–14 mm.

Fruiting pedicels

(divaricate, straight), 5–10 mm.

Fruits

didymous, mostly highly inflated (strongly flattened at least in 1/2 toward replum), 14–18 × 14–18 mm, (papery, basal sinus slightly notched, apical open, shallow);

valves (retaining seeds after dehiscence), evenly pubescent;

replum lanceolate, 7–10 mm, width 1.5–2.5 mm, as wide as or wider than fruit, apex acute to acuminate;

ovules 8–10 per ovary;

style 5–7 mm.

Seeds

flattened, (2–3 mm).

2n

= 48–52, 52, 64, 67–70.

Physaria alpestris

Phenology Flowering May–Jun.
Habitat Alpine scree, rocky ridges, talus slopes, volcanic sands and gravel, serpentine gravel, granitic slopes, mountain shrub, subalpine fir, and whitebark pine communities
Elevation (700-)1300-2400 m [(2300-)4300-7900 ft]
Distribution
from FNA
WA
[WildflowerSearch map]
[BONAP county map]
Parent taxa Brassicaceae > tribe Physarieae > Physaria
Sibling taxa
P. acutifolia, 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. oregona, 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 Lesquerella alpestris
Name authority Suksdorf: W. Amer. Sci. 15: 58. (1906)
Source Flora of North America vol. 7, p. 624.
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