Phytogeographical distribution of roadside flora along the plain to mountainous natural areas (Northern Khorasan Province, Iran)

Exploring the phytogeographical distribution of roadside flora in natural areas provides several original insights into plant dispersal. The roadside flora of the Irano–Turanian rangelands was studied in the northeast of Iran, along about 600 km of asphalt road. Sampling was performed in homogenous physiognomic-physiographic units along the altitudinal gradient from the plain to the mountainous areas. In a stratified random design, 38 sites on...