Annuals, fibrous-rooted or filiform-taprooted. Stems erect to ascending, straight or geniculate at nodes, usually simple, (3–) 5–15 (–24) cm, stipitate-glandular, hairs 0.2–0.5 mm, gland-tipped. Leaves cauline, basal not persistent; petiole (5–) 8–25 mm; blade palmately 3-veined, deltate or ovate to ovatelanceolate, 4–12 (–17) × 3–10 (–14) mm, base rounded to cuneate-truncate, margins usually denticulate, apex acute to obtuse, surfaces stipitate-glandular, hairs 0.2–0.5 mm, gland-tipped. Flowers herkogamous, 1–10, from proximal to distal nodes. Fruiting pedicels 10–25 (–38) mm, stipitate-glandular, hairs 0.2–0.5 mm, gland-tipped. Fruiting calyces tubular, weakly or not inflated, 5–6 (–7) mm, margins distinctly toothed or lobed, sparsely stipitate-glandular to sparsely hirtellous, lobes pronounced, erect. Corollas yellow, abaxial limb usually with a few red or brownish dots, radially or bilaterally symmetric, regular or weakly bilabiate; tube-throat funnelform, 7–8 mm, exserted beyond calyx margin; lobes oblong, apex rounded to truncate. Styles glabrous. Anthers included, glabrous. Capsules included, 4–6 mm. 2n = 32.

Phenology: Flowering Apr–May(–Aug).
Habitat: Ephemeral seeps, springs, rocky stream banks, moist basalt, fine gravel on bedrock, muddy hillside seeps, crevices.
Elevation: 200–1900(–2900) m.

Distribution

• Generated Map
• Legacy Map

Alta., B.C., Idaho, Mont., Oreg., Wash., Wyo.

Discussion

Erythranthe patula is distinctive with its long-petiolate leaves with ovate blades and its small, weakly bilabiate to nearly radially symmetric corollas. Vestiture may include only minute, stipitate-glandular hairs or it may be an intergrading mix of stipitate-glandular hairs and minute (0.1–0.2 mm), sharp-pointed, eglandular hairs. Plants may have stipitate-glandular pedicels and calyces but hirtellous, eglandular stems, or they may have stipitate-glandular stems and pedicels but hirtellous calyces.

Selected References

None.

Lower Taxa

None.