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Key to Erythranthe

Phrymaceae

Erythranthe

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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)
 Erythranthe michiganensis
      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