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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Climbers

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Corolla tube less than 10 mm long

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Corolla dark purple. Corona depressed Tylophora

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Corolla whitish or yellowish. Corona compressed or erect