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Keyed in multiple places:

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 Monotropa

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1 Flowers few to many per stalk, racemose; stem pubescent, at least in the inflorescence; plant yellow, orange, or red when fresh, aging or drying dark brown
1 Flower solitary and terminal on the stalk; stem glabrous; plant white, pink, yellow, orange, or salmon when fresh, aging or drying black.
..2 Flowers and stems orangish-yellow; nectaries upturned towards the flower opening; interior surface of flower segments densely pubescent (the margins of the segments strongly ciliate); stamen filaments strongly decreasing in diameter upwards
..2 Flowers and stems white or pale pink; nectaries downturned away from the flower opening; interior surface of flower segments glabrous (the margins of the segments sparingly ciliate); stamen filaments nearly isodiametric from base to summit

Key to Ericaceae, Key A: Achlorophyllous plants

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1 Flower solitary; stem glabrous; plant white (rarely pink) when fresh, aging or drying black
1 Flowers few to many, racemose; stem glabrous (Monotropsis) or pubescent, at least in the inflorescence (Hypopitys); plant yellow, orange, or red when fresh, aging or drying dark brown.
..2 Plant yellow, orange, or red when fresh, aging or drying dark brown; stem pubescent, at least in the inflorescence; petals separate to base
..2 Plant lavender when fresh; stem glabrous; petals fused into an urceolate corolla