Rhododendron barbatum Health Dictionary

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Rhododendron Barbatum: From 1 Different Sources

Wall. ex G. Don.

Family: Ericaceae.

Habitat: The Himalayas from Kumaon to Bhutan, extending to Assam.

English: Giantblood Rhododendron.

Folk: Chimal (Nepal), Kurbak, Guraans.

Action: Respiratory depressant, emetic, toxic.

The leaves and flowers gave an- dromedotoxin which resembles tertiary amine veratrum alkaloids, particularly protoveratrine, in pharmacological action. Intravenous administration of andromedotoxin to dogs 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.
Health Source: Indian Medicinal Plants
Author: Health Dictionary

Rhododendron Anthopogon

D. Don.

Habitat: The alpine Himalayas from Himachal Pradesh to Bhutan, from 3,000 to 5,000 m.

Folk: Taalisri (Punjab), Taalish (Tibet), Tazaktsum, Taalis-faz (Kashmir).

Action: Leaves—stimulant. The plant yields an incense. The leaves of R. anthopogon get mixed up with those of Abies webbiana (used for respiratory diseases).

The leaves contain quercetin, myri- cetin, taxifolin, kaempferol derivatives, ursolic acid and its acetate, epi- friedinol, beta-sitosterol, betulinic acid and rutin.

The leaves of R. lepidotum Wall. ex G. Don, known as Taalisfur in Punjab; and R. setosum D. Don, known as Tsalluo in Bhutan, possess properties similar to those of R. anthopogon.... rhododendron anthopogon

Rhododendron Arboreum

Sm.

Synonym: R. puniceum Roxb.

Family: Ericaceae.

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

English: Tree-Rhododendron, Rose-Tree.

Folk: Burans (Kumaon), Kurbak, Pullaas.

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.... rhododendron arboreum

Rhododendron Campanulatum

D. Don.

Synonym: R. aeruginosum Hk. f.

Family: Ericaceae.

Habitat: Throughout the Himalayas at altitudes of 2,400-5,200 m.

Folk: Chimal (Kumaon, Nepal), Gagger vurmi, Nichnai (Kashmir). Cherailu, Taalis-far.

Action: Leaves—used in chronic rheumatism and sciatica. As a snuff, in colds and hemicrania.

The leaves gave a toxic substance which resembles andromedotoxin; besides ericolin, ursolic acid, alpha-amy- rin, friedelin, epi-friedelinol, campan- ulin, quercitin. The pigments of flowers contain myricetin and quercetin.

Petroleum ether and chloroform extracts of leaves, stems and flowers lower blood pressure in cats and inhibit intestinal movements in rabbits.... rhododendron campanulatum

Rhododendron Cinnabarinum

Hook. f.

Family: Ericaceae.

Habitat: Eastern Himalayas, extending into the Balipura tract and Aka hills of Assam at altitudes of 2,100-4,000 m.

Folk: Balu, Sanu, Chimal (Nepal).

Action: Plant—vasodepressor.

The plant contains a toxic principle, andromedotoxin. The leaves are reported to contain friedelin, epi- friedelinol, alpha-amyrin, campanulin, ursolic acid, triterpenes and quercetin.

The flowers are reported to be poisonous.

R.falconeri Hook. f., known as Ko- rlinga in Nepal, Kegu and Kalma in Bhutan, is found in the Himalayas from Nepal to Bhutan, Aka Hills, Naga Hills and Manipur at altitudes of 2,1004,300 m.

The leaves and stem contain an- dromedotoxin; leaves also contain ur- solic acid, alpha-amyrin, friedelin, campanulin and quercetin. The flowers contain 3-rhamnoside and 3-galacto- side of quercetin. The bark gave taraxe- rol, betulinic acid and quercetin.

Petroleum ether extract of the leaves and stems lowers blood pressure in cats and inhibits intestinal movements in rabbits.... rhododendron cinnabarinum

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