Objective:To study on composition

micromorphology and toxicity of special calcium oxalate raphides in Arisaema erubescens.Method:X-ray diffraction and infrared spectrometry were used to identify composition of raphides.Micromorphology of raphides in A.erubescens was observed by scanning electron microscopy

and compared with that in other plants.Rabbit eye irritation experiment was used to test relationship between toxicity and concentration of raphides.Result:Composition of raphides in A.erubescens was determined to be calcium oxalate

microstructure of raphides’ surface was not smooth

there were a number of protrusions（barbs）

and center of this needle body had a groove

its toxicity and concentration had a significant positive correlation relationship.Conclusion:Raphides in A.erubescens was main component to produce irritating toxicity

and irritating toxicity of raphides was related with its micromorphology.