Lobelia

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  1a. Flowers 20–45 mm long; corolla fenestrate
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    L. cardinalis

    2a. Corolla red (rarely pink or white); flowers 30–45 mm long; filament tube 24–33 mm long
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    L. siphilitica

    2b. Corolla blue (rarely white); flowers 20–30 mm long; filament tube 12–15 mm long
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  1b. Flowers 7–18 mm long; corolla lacking open slits
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    L. dortmanna

    3a. Leaves all basal, with 2 hollow tubes extending the entire length; all the anthers pubescent at the apex; plants aquatic
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    3b. Leaves borne on a stem, flat, lacking interior hollow tubes; only the 2 smaller anthers pubescent at the apex; plants terrestrial
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      L. kalmii

      4a. Stem leaf blades linear to narrow-lanceolate, (0.5–) 1–4 (–5) mm wide; lower lip of the corolla glabrous on the adaxial (i.e., inside) surface
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      4b. Stem leaf blades lanceolate or oblanceolate to ovate or obovate, the principal blades 10–35 (–50) mm wide; lower lip of the corolla pubescent on the adaxial surface near the base
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        L. inflata

        5a. Corolla 6–8 mm long; hypanthium nearly as long as the distinct portion of the calyx, evidently inflated in fruit [Fig. 539]; middle stem leaf blades ± ovate-oblong; stems long-pubescent, at least below; plants annual
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        L. spicata

        5b. Corolla 7–11 mm long; hypanthium shorter than the distinct portion of the calyx, scarcely inflated in fruit [Fig. 540]; middle stem leaf blades ± oblanceolate; stems short-pubescent; plants biennial or perennial

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 Show photos of:   Each photo represents one species in this genus.