new pteris fern, {Neottopteris nidus}(L) J Sm

sweet viburnum, {Viburnum odoratissimum} Ker Gawl

syngenesious stamen, synantherous stamen

anther culture

anther cell

connective

endothecium

Changjiang Huaihe shear line

Changjiang Huaihe cyclone

pneumoconiosis

electrodes for removing dust

masticatory cycle,chewing cycle