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Key to Apocynum

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1 Corolla 5-10 mm long, pink or white with pink veins, the lobes spreading or recurved.
  2 Leaves drooping (or spreading); corolla ca. 3× as long as the calyx lobes; seeds 1.5-2 mm long
  2 Leaves spreading (or ascending); corolla ca. 2× as long as the calyx lobes; seeds 3-4 mm long
1 Corolla 3-6 mm long, white, greenish, or yellowish, the lobes erect or slightly outcurved.
    3 Leaves of the main stem with petioles 5-10 mm long; leaf base cuneate to rounded; [widespread in our area]
    3 Leaves of the main stem sessile or on petioles to 3 mm long; leaf base rounded or cordate; [of VA, WV, and MO northward]