Fig. 2

The growth form (upper panels) and habitat (lower panels) of four O. rufipogon and O. nivara populations used for in situ observations. (a, b) Two O. rufipogon populations, with SL02-R growing around a river of 3 ~ 5 m wide and 1 ~ 3 m deep (a) and SL14-R in an abundant marshy land, along with other hydrophytic weeds and fairly dense (b). (c, d) Two O. nivara populations, with SL07-N growing nearby a road and separated by paddy fields (c) and SL16-N distributes near to lake area and mix grows with other shrubs and weeds (d).