Kalmia

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  K. procumbens

  1a. Corolla 3–5 mm long, campanulate, lacking sacs, connate ca. ½ its length; leaf blades 0.3–0.8 cm long; androecium with 5 stamens; capsules 2- or 3-locular; dwarf, 
mat-forming shrubs
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  1b. Corolla 7.5–25 mm long, rotate, 10-saccate, the anthers fitting in the corolla sacs and later springing forward, connate most of its length [Fig. 614]; leaf blades 1.5–12 cm long; androecium with 10 stamens; capsules 5-locular; upright shrubs, sometimes colonial and forming thickets, but not mat-forming
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    K. angustifolia

    2a. Leaves whorled, 3 at each node [Fig. 614]; inflorescence lateral [Fig. 614]; corolla 6–12 mm wide; capsules 3–5 mm wide
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    2b. Leaves opposite or alternate; inflorescence terminal; corolla 10–25 mm wide; capsules 6–8 mm wide
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      K. latifolia

      3a. Leaves mostly alternate, the blades 5–10 cm long, lanceolate to elliptic, borne on petioles 1–2 cm long, glabrous; corolla 20–25 mm wide
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      K. polifolia

      3b. Leaves opposite, the blades 1–4 cm long, linear to lanceolate, subsessile, pubescent on the abaxial surface; corolla 10–16 mm wide

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