Variation of morphological traits, shoot yield, essential oil yield and growing degree-days in the populations of psedu chamomile (Tripleurospermum sevasnense (Manden.) Pobed.)

This research was aimed to investigate morphological and phenological traits of 12 populations of pseudo chamomile (Tripleurospermum sevasnense (Manden.) Pobed.). The study was carried out in a randomized complete block design (RCBD) with three replications in the Alborz research station, Karaj, Iran, during 2011-2013. The study traits included longitudinal and transverse diameter of canopy cover, canopy cover area, plant height, number of flowers, shoot fresh and dry weight, growing degree-days (GDD), essential oil percentage and essential oil yield. Growing degree-days was calculated for flowering and harvesting time. Analysis variance of data showed that there were significant differences among populations (P