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FNA | Family List | FNA Vol. 7 | Brassicaceae | Physaria

78. Physaria saximontana Rollins, Contr. Gray Herb. 214: 13. 1984.

Rocky Mountain or Fremont County twinpod

Perennials; caudex usually simple; (silvery) pubescent throughout, trichome rays furcate. Stems several from base, prostrate to decumbent, 0.3-1 dm. Basal leaves (rosulate; petiole winged); blade orbicular to broadly obovate, 1.5-3 cm, margins entire or with broad, obscure toothlike angles each side at apex, (apex obtuse, surfaces densely pubescent, trichomes appressed). Cauline leaves: blade broadly spatulate to linear-oblanceolate, 1-1.5 cm, margins entire. Racemes condensed, (subumbellate to slightly more elongated, few-flowered). Fruiting pedicels (divaricate-ascending, straight to slightly curved), 6-10 mm. Flowers: sepals (yellowish, often with some purple), narrowly lanceolate, 5-6 mm; petals spatulate, 7.3-9.2 mm, (not clawed). Fruits didymous, irregular, suborbicular, deeply bilobed, inflated in age, 10-12 × 12-15 mm, (papery, basal sinus absent or obsolete, apical sinus deep); valves (retaining seeds after dehiscence), densely pubescent, trichomes spreading, (ovaries and immature fruit downy; replum narrowly ovate to broadly oblong, not narrowed at middle, as wide as or wider than fruit, apex acute to obtuse; ovules 4 per ovary; style 3-7 mm. Seeds flattened.

Subspecies 2 (2 in the flora): wc United States.

1 Basal leaf blades: margins entire, apices rounded to angled; styles 3-5 mm.   78a Physaria saximontana subsp. saximontana
+ Basal leaf blades: margins dentate (teeth broad), apices angled; styles 4-7 mm.   78b Physaria saximontana subsp. dentata

Lower Taxa


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