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'''Calotropis procera Ait''' is a large shrub growing to 4 m (13 ft) 4m tall. It has clusters of waxy flowers that are either white or lavender in color. The This plant has oval, light green leaves and milky stem. The latex of Calotropis gigantea contains cardiac glycosides, fatty acids, and calcium oxalate. Arka consists of dried roots of Calotropis procera (Ait.) R. Br. (Fam.Asclepiadaceae) found wild more or less throughout Indiais belongs to Aslepiacea family. 

{{Uses|Rheumatism}}, {{Uses|Painful joints}}, {{Uses|Skin blemishes}}, {{Uses|Leucoderma}}, {{Uses|vitiligoVitiligo}}, {{Uses|Piles}}, {{Uses|Pain in ears}}<ref name="Uses"/>

The milky sap contains a complex mix of chemicals, some of which are steroidal heart poisons known as "cardiac aglycones". These belong to the same chemical family as similar chemicals found in foxgloves (Digitalis purpurea). The steroidal component includes an hydroxyl group in the C3β position, a second attached to the C14 carbon, a C/D-cis ring junction and an α,β-unsaturated-γ-lactone in the C17 position. In the plants, the steroidal component is commonly attached via a glycosidic link to a 2-desoxy or a 2,6-didesoxy sugar molecule.<ref name="Chemical Composition"/>

{{Common names|sa=Bhaanu, Ravi, Tapana, Arka|en=Aakado|gu=Aakado|hi=Aak, Akavana, Madar|kn=Ekka, Ekkadagida, Ekkegida|ks=Vasa|ml=Erikku|mr=Rui|pa=Ak|ta=Erukku, Vellerukku|te=Jilledu}}<ref name="Common names"/>

{{Leaf|Simple|Opposite|Elliptic-ovate to obovate, greyish-green in colour and have entire margins, relatively thick (5-30 cm long and 4-15 cm wide) with a cordate leaf base. Secondary veins 5-7 pairs. }}<ref name="Leaf"/>

{{Flower|borne Borne in clusters|15-25 mm across|white White or pinkishPurplish|fiveFive| Flowering occurs mostly during winter.}}

{{Fruit|largeLarge|6-12 cm long and 3-7 cm wide||These fruit have thick and spongy skins which split open at maturity|numerous brown, flattened Flattened seeds|}}

Succeeds in the drier tropics. Most commonly found in areas of the tropics with a specific dry season, at elevations up to 1,000 metres.<ref name="How to plant/cultivate"/>

<ref name="Leaf">[https://keyserver.lucidcentral.org/weeds/data/media/Html/calotropis_procera.htm Queenland govt]Kappatagudda - A Repertoire of Medicinal Plants of Gadag pdf, Page no - 91</ref>