Apocynaceae

Styles connate above; plants with white yellow or orange latex ( latex exudes in a globule on top of the broken stem or stalk; ordinary sap does not form a globule) (includes Asclepiadaceae) Apocynaceae

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Pollen consolidated into sac like pollinia, two pollina per anther; corona present

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Corolla and corona not blue

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Erect shrubs or herbs

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Corolla not reflexed at anthesis; up to 6 mm diam. Follicle smooth ovoid to elongated. Leaves with glands at base of midvein Marsdenia

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Corolla reflexed at anthesis; more than 8 mm diam. Follicle smooth and elongated or ovoid and with spines. Leaves without glands at base of midvein