Chelone

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  C. glabra

  1a. Corolla white, sometimes partly green-yellow or tinged with pink (especially near the apex), the palate pubescent with white hairs; staminode green; leaf blades usually tapering to an ill-defined petiole or subsessile
• See list of 2 species in 1b
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  1b. Corolla purple or red-purple throughout, the palate pubescent with yellow (rarely white) hairs; staminode white; leaf blades borne on distinct, slender petioles 5–30 (–40) mm long
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    C. lyonii

    2a. Leaf blades ovate, 3–10 cm wide, broadly rounded to truncate at the base; petioles 15–30 (–40) mm long; upper lip of corolla sharply ridged; lower lip of corolla pubescent with yellow hairs and thinly striped with bright purple
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    C. obliqua

    2b. Leaf blades lanceolate to narrow-elliptic, 1.4–4 cm wide, cuneate at the base; petioles 5–15 mm long; upper lip of corolla scarcely ridged; lower lip of corolla pubescent with pale yellow hairs and with or without thin, purple stripes

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