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Physaria humilis
(Rollins) O'Kane & Al-Shehbaz
Family:
Brassicaceae
St. Marys Peak Bladderpod
[
Lesquerella humilis
Rollins]
FNA
Resources
Steve L. O´Kane Jr. in Flora of North America (vol. 7)
Perennials;
caudex simple, (thickened with persistent leaf bases); densely (silvery) pubescent, trichomes 5- or 6-rayed, rays furcate or 3-branched.
Stems
simple or few to several from base, prostrate, (from below a terminal rosette of leaves, unbranched), 0.2-0.5 dm.
Basal leaves:
blade elliptic to broadly ovate or obovate, (1-)1.5-2.5(-3) cm, margins entire, (apex obtuse).
Cauline leaves:
blade spatulate, 3-7 mm, (base cuneate), margins entire.
Racemes
not loose, (scarcely elongated in fruit, 3-5-flowered).
Fruiting pedicels
(straight or slightly curved).
Flowers:
sepals (yellow-green), narrowly elliptic to narrowly long-triangular, 3.7-5 mm; petals oblanceolate to nearly obovate, 7-8.5 mm, (abruptly tapering to narrow claw).
Fruits
wider than long, apex truncate to shallowly notched, compressed (angustiseptate), 3-4 mm; valves densely pubescent, trichomes ascending to erect, sparsely pubescent inside; ovules 4 per ovary; style 2-3 mm.
Seeds
plump, (slightly compressed).
Flowering Jun-early Aug. Steep slopes, dry summits, rocky fellfields, dry ledges; of conservation concern; 2700-2900 m; Mont.
Physaria humilis
is found in metamorphosed rock and detritus on the peaks of the Bitterroot Mountains.
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This project was made possible in part by the Institute of Museum and Library Services [MG-70-19-0057-19].
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