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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Key to Apocynum

1 Corolla 5-10 mm long, pink or white with pink veins, the lobes spreading or recurved.
..2 Leaves drooping; corolla ca. 3× as long as the calyx lobes
..2 Leaves spreading; corolla ca. 2× as long as the calyx lobes
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]