Ecological wood anatomy of Rhizophora stylosa Ecological Anatomical Characteristics of Secondary Xylem in Kandelia obovata Sheue et al. Ecological Wood Anatomy of Avicennia marina Effects of different physicochemical factors on growth of tissue culture seedlings and accumulation of total flavonoids in Saussurea involucrata Ecological Wood Anatomy of Avicennia marina Effects of different physicochemical factors on growth of tissue culture seedlings and accumulation of total flavonoids in Saussurea involucrata