Plant: Perennial herb; stems to 80 cm tall, usually producing branches along their entire length Leaves: to 15 cm long, to 3 cm wide, sessile, narrowly elliptic to lanceolate, occasionally oblanceolate; margins toothed to lobed, sometimes pinnatifid, sometimes approaching entire in very narrow leaves; upper leaves commonly with broad, clasping bases and sometimes with clasping basal lobes INFLORESCENCE: cymose Flowers: pedicellate, subtended by 0-2 linear-lanceolate entire or few-toothed to lobed bracts, these sometimes fused to ovary; petals yellow, rarely nearly white, 9-23 mm long, 3-10 mm wide, with trichomes at apex only; staminodia 5, occasionally more or fewer, slightly smaller than petals; outer several whorls of stamens with broadened filaments; style (7-)10-14 mm long; stigmatic papillae forming a slight tuft Fruit: capsules cylindric, sometimes broadly so, mostly 10-20 mm long, sometimes shorter when depauperate. SEEDS horizontal, winged, oval to obovate, flattened; testa cells with sinuate adjoining walls, the surface walls with a finely cobble-stone dome Misc: on sand and gravel bars, roadcuts and banks; 50-2300 m (100-7500 ft); mostly Mar-Oct, potentially flowering year-round at lower elevations Notes: staminodia = 5. References: Kearney & Peebles; Arizona Flora. Christy, Charlotte M., Journal of AZ-NV academy of Science.