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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