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,
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.
Was this article helpful?
Learn what you can do with herbs! How to Plant, Grow, and Cook with Natural Herbs. Have you always wanted an herb garden but didn't know how to get started? Do you want to know more about growing your own herbs in the privacy of your home and using them in a variety of cooking?