Vegetative key to the families

Vegetative Key Vegetative key to the families

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LATEX (milky white or yellow) present in stem and leaves

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Either; plants climbing or trailing; or, shrubs or trees

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Climbers or trailers

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Leaves opposite

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Either; two small glands present on the upper part of the petiole near the blade; or, leaf blades narrow or rounded at the base Apocynaceae

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Glands absent from the petiole but sometimes present on the midrib just above the petiole. Leaf blades truncate or cordate at the base (if rounded then glands present on the midrib (previously Asclepiadaceae) Apocynaceae