Phytoneuron 2012-39: 44. 2012.
Perennials, rhizomatous, rooting at nodes, rhizomes filiform. Stems erect, sometimes decumbent-ascending proximally, simple or few-branched, 20–50 cm, glabrous or sparsely stipitate-glandular in inflorescence. Leaves basal and cauline, even-sized or largest near mid-stem; petiole 0 mm or proximalmost 2–10 mm; blade palmately 3–5-veined, orbicular or suborbicular to broadly elliptic, broadly ovate, or depressed-ovate, 20–40 (–75) × 12–35 (–40) mm, base usually truncate to broadly cuneate, margins entire or subentire to mucronulate, shallowly dentate, or denticulate, apex rounded, surfaces glabrous or glabrate to sparsely stipitate-glandular and sparsely pilose, hairs thin-walled, abaxial often glaucous. Flowers herkogamous, 6–16, from proximal to distal nodes, in a loose raceme, distal bracts becoming much reduced. Fruiting pedicels (25–) 40–75 mm, stipitate-glandular to short-villous, hairs gland-tipped. Fruiting calyces broadly ovate-cylindric, inflated, sagittally compressed, (10–) 11–17 (–20) mm, stipitate-glandular or minutely hirtellous or a mixture, hairs sometimes also longer, thin-walled, eglandular or glandular, throat not closing, adaxial lobe slightly longer, triangular-blunt. Corollas yellow, abaxial limb prominently darker yellow, sparsely purple-spotted, bilaterally symmetric, weakly bilabiate; tube-throat narrowly funnelform to broadly cylindric, 10–15 mm, exserted 5–8 mm beyond calyx margin; limb expanded 12–20 mm. Styles hirtellous. Anthers included, glabrous. Capsules included, 5–7 mm. 2n = 28, 30.
Phenology: Flowering (Feb–)May–Aug(–Oct).
Habitat: Drainage ditches, springs, seeps, wet meadows, margins of ponds and small streams, marshy areas.
Elevation: 1400–2500 m.
Calif., Colo., Nev., Utah.
Erythranthe utahensis is characterized by its erect stems, prolifically produced filiform rhizomes, basal leaves short-petiolate to subsessile and cauline sessile, blades suborbicular to broadly ovate or depressed ovate with thin-walled villous-glandular hairs on both surfaces, margins subentire, proximal pedicels elongating to 75 mm, and calyces open at maturity.