Aliso 30: 54, figs. 12–16. 2012.
Annuals, taprooted. Stems erect, simple or branched from basal nodes, 2–10(–15) cm, sparsely glandular-pubescent, internodes elongate, distinct. Leaves cauline, basal not persistent; petiole 0–1 mm; blade palmately 3-veined (in broader ones), lanceolate to ovate, 3–25 × 2–8(–10) mm, base attenuate, margins entire, sometimes toothed, apex acute to obtuse, surfaces sparsely glandular-pubescent. Flowers herkogamous, sometimes plesiogamous, 1–16, from distal or medial to distal nodes. Fruiting pedicels (3–)5–20 mm. Fruiting calyces campanulate to widely cylindric, 5–7 mm, margins distinctly toothed or lobed, sparsely glandular-pubescent, ribs strongly angled, lobes pronounced, erect. Corollas yellow or white and throat yellow, throat and limb red-spotted, bilaterally symmetric, weakly bilabiate; tube-throat cylindric, 6–13 mm, exserted beyond calyx margin; limb expanded 3–7(–9) mm, lobes notched, abaxial limb sparsely bearded or glabrous. Styles glabrous. Anthers included, glabrous. Capsules included, 4–6 mm.
Phenology: Flowering Apr–Jun.
Habitat: Creosote bush and Joshua tree woodlands, usually on carbonate substrate, primarily on talus slopes.
Elevation: 900–2200 m.
Erythranthe calcicola was previously included in the broader concept of E. montioides; the former can be distinguished by its glandular herbage, broader lanceolate to ovate leaves, strongly angled calyces, and smaller flowers. The species is restricted to the northern Mojave Desert and southwestern Great Basin and occurs primarily on talus slopes on substrates derived from carbonate rock.