Rhododendron arboreum Sm

Family ► Ericaceae.

Habitat ► The temperate Himalayas from Kashmir to Bhutan, the Nilgiris, Khasi Hills and Travancore.

English ► Tree-Rhododendron, Rose-Tree.

Action ► Leaf—anticephalalgic (applied to the forehead). Leaf and stem-bark—spasmolytic. Flowers— used in diarrhoea and dysentery.

The green leaves contain a gluco-side, ericolin. The extracts of leaves,

Rhododendron campanulatum D. Don. 547

stems and bark cause hypotension in cats and inhibit intestinal movements in rabbits. The acetone and chloroform extracts and a resinous fraction from the alcoholic extract of leaves depress respiration. The petroleum ether extract decreases the rate of heartbeat and contraction in isolated heart of frog.

An alcoholic (50%) extract of the flowers lowered blood pressure in dogs and albino rats.

Cyanidin-3-galactoside and cyani-din-3-arbinoside are present in the pigments of flowers. The leaves of var. nilgiricum and var. cinnamonum contain ursolic acid, friedelin, epifrie-delanol, quercetin. A triterpenoid, campanulin, has been isolated from the leaves of var. nilagaricum.

resulted in 20-40% reduction in blood pressure. It also closely resembles protoveratrine in its stimulating effect on the barostatic-pressor-reflex-mechanism, respiratory effects and emetic action. It produces reflex va-sodepressor responses in intact animals; in debuffered dogs, it produced vasopressor responses. It also produced, both direct and indirect, positive ionotropic effects, the latter being more pronounced.

The leaves contain ursolic acid, alpha-amyrin, epi-friedelinol, cam-panulin and hyperoside. Chloroform extract of the leaves and shoots showed a depressant action. The honey from flowers is poisonous; contains an-dromedotoxin.

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    What is extract of Rhododendron arboreum?
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