Roundleaf lobelia (Lobelia rotundifolia)

Same genus

• Great blue lobelia (Lobelia siphilitica)
• Indian-tobacco (Lobelia inflata)
• Southern lobelia (Lobelia amoena)
• Apache lobelia (Lobelia anatina)
• Pale lobelia (Lobelia appendiculata)
• Berlandier's lobelia (Lobelia berlandieri)
• Boykin's lobelia (Lobelia boykinii)
• Shortleaf lobelia (Lobelia brevifolia)

The whole genus Lobelia