The characteristics of long cells, papillae with different sizes, stomata on leafback in 33 accessions of weedy rice (Oryza sativa f. spontanea) and 6 accessions of cultivated rice (Oryza sativa L.) were observed with a light microscopy (LM). The principal component analysis (PCA) and cluster analysis were conducted using the above data. Three principal components were obtained, in which the number and diameter of the large, medium and small papillae on the long cells, stomatal density contributed most variance. The morphological features of the leaf epidermis varied significantly among the accessions. The results may be valuable for the taxonomic identification and studies on origins of weedy rice.
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