Morphology and Distribution of Calcium Oxalate Crystals in Pinellia pedatisecta Schott (Araceae) Comparisons of crystal form of raphides to toxicity raphidesin four poisonous herbs of Araceae family Anatomical structure and histochemical localization about rhizomes of five species of Polygonatum Study of Stinging Crystals in Tian Nanxing Inflammation-induced effect of toxic raphides from Pinellia ternata Inflammation-induced effect of toxic raphides from Pinellia ternata