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Key to Erythranthe

1 Stems and pedicels glandular-villous with gland-tipped hairs (at least some of them > 1 mm long); [section Mimulosma]
..2 Perennial with stoloniferous rhizomes, rooting at lower nodes; stems 20-30 (-40) cm tall; corolla 11-16 mm long
..2 Annual with fibrous roots; stems < 20 cm tall; corolla (4-) 5-10 mm long
1 Stems and pedicels glabrous to hirtellous, gland-tipped hairs absent (or if present < 1.0 mm long); [section Simiola].
....3 Fruiting calyces closed at the throat, lower lobes turned upward against the upper lobe
....3 Fruiting calyces open at the throat, lateral calyx lobes mostly shallowly deltate to merely apiculate or absent, sometimes obscure or obsolete, not turned upward to close the throat.
......4 Flowers herkogamous, corolla limb expanded 10–15 mm (pressed)
......4 Flowers plesiogamous, corolla limbs expanded 5–8 mm or 1–1.5 mm (pressed).
........5 Fruiting calyces minutely hirtellous; stems often prostrate to decumbent but becoming fully erect at least in the inflorescence, commonly distinctly fistulose
........5 Fruiting calyces glabrous to sparsely villous-glandular; stems prostrate to erect, not fistulose