Akebia Stem-Akebiae Caulis-Akebia quinata or Akebia trifoliata

Akebia Stem

Akebiae Caulis

Akebia Stem is the climbing stem of Akebia quinata Decaisne or Akebia trifoliata Koidzumi (Lardizabalaceae), usually cut transversely.

Description:

Circular or ellipsoidal sections 0.2 . 0.3 cm in thickness, and 1 . 3 cm in diameter; phloem on both fractured surfaces is dark grayish brown; zylem reveals light brown vessel portions and grayish white medullary rays lined alternately and radially; pith light grayish yellow, and distinct; flank grayish brown, and with circular or transversely elongated elliptical lenticels.
Almost odorless; slightly acrid taste.
Under a microscope, a transverse section reveals ring layers mainly consisting of fiber bundles with crystal cells and stone cell groups and surrounding the outside of the phloem in arc shape. Medullary rays of the phleom consisting of sclerenchymatous cells containing solitary crystals; portion near cambium is distinct; cells around the pith remarkably thick-walled; xylem medullary rays and parenchymatous cells around the pith contain solitary crystals of calcium oxalate and starch grains less than 8 mm in diameter.

Identification:

To 0.5 g of pulverized Akebia Stem add 10 mL of water, boil, allow to cool, and shake vigorously: lasting fine foams are produced.

Total ash:

Not more than 10.0z.

Containers and storage:

Containers.Well-closed containers.

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