Leafy Bluebell, Leafy Lungwort, Oblongleaf Bluebells, Prairie Mertensia, Sagebrush Bluebells: Mertensia oblongifolia (Synonyms: Mertensia bakeri, Mertensia bakeri var. osterhoutii, Mertensia cusickii, Mertensia fusiformis, Mertensia lanceolata var. fendleri, Mertensia lanceolata var. nivalis, Mertensia lanceolata var. pubens, Mertensia lanceolata var. viridis, Mertensia oblongifolia var. amoena, Mertensia oblongifolia var. nevadensis, Mertensia oblongifolia var. oblongifolia, Mertensia oreophila, Mertensia paniculata var. nivalis, Mertensia perplexa, Mertensia toiyabensis, Mertensis x umbratilis, Mertensia viridis, Mertensia viridis var. caelestina, Mertensia viridis var. cana, Mertensia viridis var. cynoglossoides, Mertensia viridis var. parvifolia) - Plants small, rarely growing over 40 cm high. Stem leaves usually 2.5-7 tims longer than wide, lacking lateral veins. Corollat tube 1.3-2 tims longer than the limb. Plants of open, grassy areas.
Northern Bluebells, Tall Bluebells, Pan Bluebells, Tall Lungwort, Tall Mountain Mertensia: Mertensia paniculata var. borealis (Synonym: Mertensia paniculata) - Plants tall and well developed, measuring from 40-150 cm high. Stem leaves with evident lateral veins and rounded at the base with petioles. Corolla limb 1.2-16 times as long as the tube. Plants typically of moist, streamside or lakeside meadows or moist forest edges.