Identification & Quality Standard
Dryopteridis Crassirhizomatis Rhizoma
Botanical Origin
The dried rhizome and remnants of leaf stems of Dtyopteris crassirhiaoma Nakai.(Dryopteridaceae)
Production Regions
Primarily produced in Inner Mongolia, northeastern China, Hebei, and Gansu.
Quality Requirements
Superior medicinal material is large, firm, with brownish-green fractured surface of remnants of leaf stems.
Macroscopic Features
Long inverted oval shape, slightly curved, apex is blunt round or flat, lower portion relatively pointed, some are longitudinally cut into 2 halves, 7~20cm long, 4~8cm diameter. Externally yellowish-brown to blackish-brown, densely arranged remnants of leaf stems and scale leaves, and curved rootlets. Remnants of leaf stem is flat round, 3~5cm long, 0.5~1.0cm diameter; externally has longitudinal ridges, hard and brittle texture, fractured surface is relatively flat, brown, with 5~13 yellowish-white vascular bundles arranged in rings; every remnant of leaf stem has 3 rootlets on the outside, scales are strip-like lanceolate, whole, and often fall off. Hard texture, fractured surface is relatively flat, dark green to brown, with 5~13 yellowish-white vascular bundles arranged in rings, outside has relatively more leaf trace bundles. Distinctive odor, tasteless and slightly astringent, then gradually bitter and acrid.
