Rheum nobile
Species of flowering plant / From Wikipedia, the free encyclopedia
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Rheum nobile, the Sikkim rhubarb[1] or noble rhubarb or पदमचाल, is a giant herbaceous plant native to the Himalaya, from northeastern Afghanistan, east through northern Pakistan and India (in Sikkim), Nepal, Bhutan, and Tibet to Myanmar, occurring in the alpine zone at 4000–4800 m altitude.[2]
Noble rhubarb | |
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Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Eudicots |
Order: | Caryophyllales |
Family: | Polygonaceae |
Genus: | Rheum |
Species: | R. nobile |
Binomial name | |
Rheum nobile | |
It is an extraordinary species of rhubarb (genus Rheum). At 1–2 m tall, the monocarpic inflorescences of R. nobile tower above the other shrubs and low herbs in its habitat, and it is visible across valleys a mile away.[3]
R. nobile is often called a glasshouse plant because of its outer curtain of translucent bracts which pass visible light, creating a greenhouse effect, while blocking ultraviolet radiation. These are likely defenses against the increased UV-B exposure and extreme cold in its high altitude range.[4]