Wild C. dubia (whole part) was collected from Thruenchela (Altitude: 4651 m; Latitude: 27°56'
00.1''; Longitude: 89° 26' 11.6''; global positioning system (GPS) point number: 167; Site number:
P167; Slope: 30°; Aspect: North-West), under the Lingzhi region in Bhutan in August 2009. The
herbarium voucher specimen with accession number 78 was authenticated by Samten, a
pharmacognosist at the Pharmaceutical and Research Unit (PRU) and was deposited at the herbarium
unit of PRU, Thimphu, Bhutan