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Key to Palustricodon
Campanulaceae
Palustricodon
https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=40909
1 Corollas 4-8 (-8.5) mm long, 2-2.7× as long as the calyx, usually white; calyx 1.3–3.8 mm long during flowering, the lobes (0.7-) 1-1.3 (-2) mm long; leaf blades crenate, elliptic to lanceolate or narrow-lanceolate; stems usually branching at wide angles (mostly 60–90 degrees); capsules 1.5-2 mm long; seeds dark brown, the surface minutely roughened and sublustrous
1 Corollas 8-14 mm long, 2.3-4.6× as long as the calyx, usually blue or blue-tinged; calyx 3-6.7 mm long during flowering, the lobes 1.5-3 (-4) mm long; leaf blades usually minutely dentate (varying to entire), lanceolate to linear; stems usually branching at narrow angles (mostly 40–60 degrees); capsules 2-3 mm long; seeds light brown, the surface smooth and lustrous