Study on Identification Characteristics of Dichrocephala auriculata(Thunb.) Druce / 广州中医药大学学报

ABSTRACT

Objective To identify the pharmacognosy features of Dichrocephala auriculata(Thunb.)Druce,and to summarize its identification characteristics,so as to lay a foundation for further study and development of the drug. Methods By original plant identification and microscopic identification methods,we observed the features of the whole plant of Dichrocephala auriculata(Thunb.)Druce. Results The morphological characteristics of the original plant showed as followsthe whole aerial part was covered with tomentum;roots belonged to taproot root system;the alternate leaves were long oval-shaped, pinnatipartite, or divided;flowers were small, presented as capitulum, arranging in umbrella-shape, with several outer layers of white flowers and several inner layers of yellow green flowers. Microstructure characteristics showed as followsroot vascular bundle was broad,and pericycle fiber bundles were found outside;stem vascular bundle had 8-25 cyclocytics,pericycle fibers were found outside, and the medulla was broad with myelinated fibers around;the upper and below epidermis of leaves had stomata and non-tentacle, and the main vein vascular of the leaf was collateral with vascula bundles upside and downside;the nonglandular hairs,starch grains,fibers,pollen grains,and tubes were shown in the powder of whole plant. Conclusion The above results are stable and reliable, and can be applied for pharmacognosy identification of Dichrocephala auriculata(Thunb.)Druce.