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Key to Canna

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1 Flowers not tubular at the base (or with a short tube to 2 cm long); petals erect
1 Flowers tubular at the base (the tube 1-4.5 cm long); petals reflexed (or ascending to erect in C. glauca).
..2 Flowers red, orange, or mixed red-and-yellow; capsule 1.5-2 cm wide; leaves green
..2 Flowers yellow; capsule 2-4.5 cm wide; leaves glaucous.
....3 Inflorescence with < 5 flowers; seeds 6-6.5 mm long
....3 Inflorescences with > 10 flowers; seeds 7-10 mm long
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