Leaf morphology and photosynthetic characteristics of wild Ussurian pear in China. Effects of different phosphorus levels on root physiological and leaf photosynthetic characteristics of flue-cured tobacco Identification characters of leaf venation of Bidens pilosawith its confused herb Bidens pilosavar. radiata Identification characters of LMVP of Bidens pilosa with its confused herb Bidens pilosa var. radiata Acclimation in Leaf Morphological and Eco-physiological Characteristics of Different Canopy-dwelling Epiphytes in a Lower Subtropical Evergreen Broad-leaved Forest