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'''Karavira''' consists of dried leaves of Nerium indicum Mill. Syn. Nerium odorum Soland (Fam.Apocynaceae), It is a large evergreen woody shrub with milky Juice, . It is foundthroughout the year in upper Gangetic plains, Himalayas, from Nepal to Kashmir upto 2000 m. Central and Southern India, also cultivated near temples and gardens.<ref name="AYURVEDIC PHARMACOPOEIA OF INDIA"/> 

{{Uses|Fever}}, {{Uses|Wound healing}}, {{Uses|Skin diseases}}, {{Uses|Itching}}, {{Uses|Inflammation}}.<ref name="Uses"/>

{{Common names|sa=Hayamaaraka, Harapriya|en=Indian Oleander|gu=Kanera, Karena, Karen|hi=Kaner|kn=Kanagalu, Kanagile|ks=Gandeela, Gandula|ml=Kanave eram, Arali, Kattalari|mr=Kanher|pa=Kaner|ta=Arali, Alari, Aatrulari|te=Ganneru}}<ref name="Common names"/>

Cardiac glucoside A water extraction of crushed leaves of Nerium oleander yielded 2.3% of a crude polysaccharide. The main fraction (oleandrin67%)represents a pectic polysaccharide mainly composed of galacturonic acid besides rhamnose, arabinose and galactose.<ref name="Chemical Composition"/>

{{Flower|Bisexual|Terminal and axillary panicles|greenish Greenish yellow|5|Flowers white, pink or dark red, single or double in cultivated, form, fragrant 3-4 cm across, peduncle and pedicel hairy, bracts small, 5-7.5 mm long. Calyx c. 6.25 mm long, divided into 5 linear, acute lobes, hairy with gland at the base inside. Corolla tube 1.8 cm long, hairy within, throat narrow, ending in five twisted petals, tips rounded, corona of 5 scales near the throat of the corolla, cleft into 4-7 linear segments. Stamen included, filament short, Anthers connivent and adherent to stigma, connectives hairy, produced upward into long thread-like hairy appendages. Ovary with two distinct carpels, style filiform, thickened upward; stigma two lobed. }}

{{Fruit|Follicle|12-20 cm x 7:5 mm long.||Seeds brown with bristles}}