Phytoneuron 2012-39: 35. 2012.
Annuals, taprooted. Stems erect, simple, sometimes branched from basal nodes, 3–32 cm, minutely puberulent. Leaves cauline, basal not persistent; petiole 0 mm; blade palmately 3-veined (in broader ones), linear to elliptic, 5–22(–30) × 1–5 mm, base narrowed, margins entire, sometimes toothed, apex acute to obtuse, surfaces minutely puberulent. Flowers herkogamous, sometimes plesiogamous, 1–106, from distal or medial to distal nodes. Fruiting pedicels 2–18 mm. Fruiting calyces becoming red-angled or red, campanulate to nearly cylindric, 4–9 mm, margins distinctly toothed or lobed, glabrous or minutely puberulent, ribs thickened, lobes pronounced, erect, margins ciliate. Corollas yellow and abaxial limb and throat red dotted or pink to purple and throat yellow, bilaterally symmetric, weakly bilabiate; tube-throat cylindric, 4–10 mm, exserted beyond calyx margin; limb expanded 3–5 mm, lobes entire or weakly notched, abaxial limb glabrous. Styles glabrous. Anthers included, glabrous. Capsules included, 3–8 mm.
Phenology: Flowering Apr–Jun.
Habitat: Open slopes and washes.
Elevation: 300–3000 m.
Ariz., Calif., Colo., Nev., N.Mex., Tex., Utah, Wyo., Mexico (Baja California, Sonora).