Gentiana

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  1a. Leaf blades and lobes of the calyx prominently ciliolate (note: the cilia visible at low magnification); lobes of the corolla about as long as or shorter than the appendages in the sinuses of the corolla
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    G. clausa

    2a. Appendages in the sinuses of the corolla 2- or 3-cleft, about as long as the corolla lobes [Fig. 666]; lobes of the corolla broad-rounded at the apex and about as wide as the plaits [Fig. 666]; calyx lobes usually broad-lanceolate to obovate
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    G. andrewsii

    2b. Appendages in the sinuses of the corolla fimbriate, longer than the corolla lobes [Fig. 665]; lobes of the corolla truncate and often apiculate, narrower than the plaits [Fig. 665]; calyx lobes usually lanceolate to elliptic
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  1b. Leaf blades and lobes of the calyx lacking cilia or with scattered, minute cilia; lobes of the corolla 1.5–5 times as long as the appendages in the sinuses of the corolla
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    G. linearis

    3a. Involucral leaf blades ascending, linear to linear-lanceolate, 3–15 mm wide; lobes of the corolla 1.5–3 times as long as the appendages in the sinuses of the corolla; leaf blades narrow-lanceolate, dark green, not clasping at the base
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    G. rubricaulis

    3b. Involucral leaf blades spreading, narrow-ovate to ovate, 15–30 mm wide; lobes of the corolla 3–5 times as long as the appendages in the sinuses of the corolla; leaf blades broad-lanceolate, light green, somewhat clasping at the base

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