Botanical name: Calotropis procera    Family: Apocynaceae (Oleander family)
Synonyms: Asclepias procera, Calotropis wallichii, Madorius procerus

Rubber bush is a spreading shrub or a small tree to 4 m, oozing copious milky sap when cut or broken. Leaves are opposite, grey-green, broadly elliptic but varying between ovate and obovate, large up to 15 cm long and 10 cm broad, with a pointed tip, two rounded basal lobes and no leaf stalk. Flowers are waxy white, petals 5, purple-tipped inside and with a central purplish crown, carried in stalked clusters at the ends of the branches. Fruit is grey-green, inflated, 8-12 cm long, containing numerous seeds with tufts of long silky hairs at one end.
Medicinal uses: The bark and leaves are used for the treatment of leprosy and asthma, respectively.

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The flower labeled Rubber Bush is ...