propagating rare plants and valuable medicinal herbs has been created at Musadhar near the entrance of the site. Rare and valuable medicinal plants are the subject of special programs. These include Aconitum heterophyllum, A. falconeri, Arnebia benthamii, Dactylorhiza hatagirea, Gymnadenia orchides, Megacarpaea polyandra, Picrorhiza kurrooa, Podophyllum hexandrum and Taxus wallichiana. Research plots have been set up to determine the best way to control the spread of the tall Himalayan knotweed Polygonum polystachium without damaging other plants or the surface of the soil. A first annual survey was conducted in 2004 and will be repeated annually. See also Silent Valley National Park Yumthang Valley of Flowers in Sikkim Lakshman Ganga River Pushpawati River K. R. Keshava Murthy, 2011. Floral Gallery of Himalayan Valley of Flowers and Adjacent Areas, published by the author, Gurudwara Shri Hemkund Sahib K R Keshava Murthy, 2020. Second edition- (Revised and enlarged) Floral Gallery of Himalayan Valley of Flowers and Adjacent Areas, published by Walkin the woods. Dehradun. References External links Official UNESCO website entry United Nations Environment Programme Valleys of Uttarakhand National parks in Uttarakhand Himalayas Geography of Chamoli district World Heritage Sites in India 1939 establishments in British India Protected areas established in 1939 1980 establishments in Uttar Pradesh Protected areas established in 1980 Hiking trails in Uttarakhand