Duration: Perennial. Nativity: Native. Lifeform: Forb/Herb. General: Annual, perennial, or biennial, hirsute throughout, increasing basally, stems erect, branching throughout. Leaves: Pinnatifid, lyrate, or lobed, segments broad, coarsely toothed, occasionally glabrous but generally hirsute, cauline leaves somewhat smaller than the basal leaves, sessile or borne on short petioles. Flowers: White to purple, borne in terminal clusters, petals spatulate with pinnatifid margins, sepals with white margins, strongly gibbous at the base, anthers oblong. Fruits: Thin and linear, to 6 cm, ovules many (to 110) per ovary. Ecology: Found in shady areas, on rocky soils, in foothills, canyons, stream beds, and scrub woodlands; 2,500-6,500 ft (762-1981 m); flowers January-May. Distribution: se AZ, sw NM; south to n MEX. Notes: Distinguished by being an erect annual, 20-80 cm, persisting as a distinct hairy basal rosette with pinnately-lobed leaves, the lobes with broad teeth; stem leaves the same and becoming reduced upward and long, linear fruits. Especially distinct from other mustards are the lobed white petals.

Santa Catalina Mountains
Sabino Canyon Recreation Area.
Location: Edge of Creek Trail 200 ft upstream from dam.
4/20/17

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