Arrowhead mushroom
1、 Pharmacopoeia standard of arrowhead mushroom       This product is the dry pseudobulb of orchid plant gremastra appendiculata (D.Don) Makino, Pleione bulbocodioides (franch.) Rolfe or Yunnan Pleione yunnanensis Rolfe. . Excavate in summer and autumn, remove the aboveground parts and sediment, and put them in boiling water pots separately until they are thoroughly steamed and dried.
      [character] the mushroom is irregular oblate or conical, with gradual protuberance at the top and fibrous root marks at the base. It is 1.8 ～ 3cm long and 1 ～ 2cm in diameter in the expanded part. The surface is yellowish brown or brown, with longitudinal wrinkles or grooves. There are 2 ～ 3 micro protuberant links in the middle, and there are filamentous fibers left after the scaly leaves are dry and rotten on the nodes. It is hard and hard to break. The section is gray white or yellowish white and slightly horny. .
      The ice hockey is cone-shaped, bottleneck shaped or irregular mass, with a diameter of 1-2cm and a height of 1.5-2.5cm. The tip is tapered, the tip is in a disc shape at the broken end, the base is expanded and flat, the center is concave, and there are 1-2 links, mostly on one side. The surface of those with skin removed is yellowish white, and those with skin are light brown, smooth, and have irregular wrinkles. The section is light yellow, and the cuticle is translucent.
      [identification] cross section of this product: the outermost layer of Sagittaria pilosula is a layer of flat epidermal cells, which has 2-3 rows of cells, the wall is slightly thick, light yellow, and then inward is a large round like parenchyma cells, containing mucus and starch granules. The parenchymal cells near the epidermis contained calcium oxalate needle crystal bundles, 70-150 μ m in length. The vascular bundles are scattered and tough outside.
      The epidermal cells of ice hockey cones extend tangentially, starch granules exist in smaller parenchyma cells, and vascular bundle sheath fibers are half moon shaped, occasionally two half moon shaped.
      Decoction pieces
      [processing] remove impurities, soak in water for about 1 hour, moisten thoroughly, slice, dry or wash dry, and mash when used.
      . Return to the liver and spleen meridians.
      [functions and indications] clearing heat and detoxifying, resolving phlegm and resolving phlegm. It is used for carbuncle and scrofula, scrofula and sputum, snake and insect bites, and scrofula.
      [usage and dosage] 3 ～ 9g. Suitable for external use.
      [storage] put it in a dry place.


2、
Rhododendron rhizomes contain mucus and glucomannan (mannose: glucose (2:1)).

3、 Pharmacological effects of arrowhead mushroom
Azalea Ⅱ (15ug/kg) IV could reduce the blood pressure of rats from 14.2kpa (10 ＞ mmHg) to 9.07kpa (168mmhg), and the hypotensive effect lasted for > 30min.