Stems erect, usually branched, 10–80 cm. Leaves mainly cauline, 2–12 cm long. Flowers: calyx 2–5 mm long; sepals equal; corolla yellow, tube 3–5 mm long, lobes ca.1 mm long; fornices absent; stamens inserted at the top of the tube. Nutlets ovoid, 2–3 mm long, green to black
(Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).