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Fremont County twinpod

Fremont County twinpod, Rocky Mountain or Fremont County twinpod

Habit Perennials; caudex usually simple; (silvery) pubescent throughout, trichome rays furcate.
Stems

several from base, prostrate to decumbent, 0.3–1 dm.

Basal leaves

blade margins dentate, (teeth broad), apex angled.

(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).

Flowers

sepals (yellowish, often with some purple), narrowly lanceolate, 5–6 mm;

petals spatulate, 7.3–9.2 mm, (not clawed).

Styles

4–7 mm.

Fruiting pedicels

(divaricate-ascending, straight to slightly curved), 6–10 mm.

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.

Ovules

4–8 per ovary.

Seeds

flattened.

Physaria saximontana subsp. dentata

Physaria saximontana

Phenology Flowering Jun–Jul.
Habitat Open gravelly slopes, scree, mountain fellfields on limestone
Elevation 1500-2700 m (4900-8900 ft)
Distribution
from FNA
MT
[BONAP county map]
from FNA
MT; WY
[BONAP county map]
Discussion

Subspecies 2 (2 in the flora).

Physaria saximontana (especially subsp. dentata) is morphologically similar to 22. P. didymocarpa.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
1. Basal leaf blades: margins entire, apices rounded to angled; styles 3-5 mm.
subsp. saximontana
1. Basal leaf blades: margins dentate (teeth broad), apices angled; styles 4-7 mm.
subsp. dentata
Source FNA vol. 7, p. 662. FNA vol. 7, p. 661.
Parent taxa Brassicaceae > tribe Physarieae > Physaria > Physaria saximontana Brassicaceae > tribe Physarieae > Physaria
Sibling taxa
P. saximontana subsp. saximontana
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. 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. scrotiformis, P. sessilis, P. spatulata, P. subumbellata, P. tenella, P. thamnophila, P. tumulosa, P. valida, P. vicina, P. vitulifera
Subordinate taxa
P. saximontana subsp. dentata, P. saximontana subsp. saximontana
Synonyms P. saximontana var. dentata
Name authority (Rollins) O’Kane: Novon 17: 381. (2007) Rollins: Contr. Gray Herb. 214: 13. (1984)
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