Chlorocrambe hastata (S. Watson) Rydberg, Bull. Torrey Bot. Club 34: 436. 1907; Caulanthus hastatus S. Watson, Botany (Fortieth Parallel), 28, plate 3. 1871; Streptanthus hastatus (S. Watson) M. Peck, Man. Pl. Oregon 353. 1941. TYPE: United States, Utah, “on shaded slopes in the Wahsatch,” 7000 ft, Aug 1869, S. Watson 114 (lectotype designated by Welsh (Utah Fl., ed. 3, 266. 2003), US!; isolectotypes, GH!, NY!).
Herbs, perennial, glabrous; caudex few branched or unbranched, woody, without leaf remains of previous years. Stems 5–15 dm, erect, stout, 1 or few from caudex, simple or few branched above. Cauline leaves usually hastate, lowermost lyrate or sinuately lobed; petiole of lowermost leaves 6–15 cm, becoming much shorter upward; leaf blade deltoid to lanceolate, 5–20 x 3–7 cm, margin entire or subapically denticulate, apex acute; uppermost leaves narrowly lanceolate, entire, short petiolate. Racemes lax, soon much elongating; fruiting pedicels divaricate or slightly reflexed, often curved upward, 5–12 mm, stout and thicker than gynophore. Sepals yellowish green, narrowly lanceolate, 4–6 x 1–1.5 mm; petals white, 5–7 mm; blade linear, 2.5–4 x 0.5–1 mm; claw 2–3.5 x 1–1.7 mm, margin dentate to sublaciniate; filaments 5–9 mm; anthers linear, 2.5–3.5 mm. Fruit linear, 4–13 cm x 1.5–2.5 mm, subtorulose, slightly flattened or subterete, divaricate; gynophore (1–)2–8(–10) mm; style obsolete or rarely to 0.5 mm. Seeds brown, oblong, 3–5 x 1.7–2.2 mm; wing distal, to 0.7 mm wide.
Flowering: Jun–Aug.
Habitat: shady damp areas, stony and brushy hillsides, mountain slopes and canyons, alder thickets.
Elevation: 1500–2800 m.
Distribution: United States (W Idaho, NE Oregon, Utah).