Common Bletilla Tuber
Common Bletilla Tuber is the dried tuber of Bletilla striata (Thunb.) Reichb. f. (Fam. Orchidaceae). The drug is collected in summer and autumn, removed from fibrous root, washed, boiled or steamed until absent from white spot on the cut surface, dried briefly in the sun, peeled to remove the outer tissue, and then dried in the sun.
Description Irregularly oblate, mostly with 2-3 claw-like branches, 1.5-5 cm long, 0.5-1.5 cm thick. Externally greyish-white or yellowish-white, possessing several concentric rings and brown dotted rootlet scars, with raised stem scars above and with a trace of another tuber jointed below. Texture hard and uneasily broken, fracture whitish and horny. Odourless; taste, bitter and viscous on chewing.
Identification Powder: Yellowish-white. The anticlinal walls of epidermal cells sinuous, slightly thickened, lignified, with distinct pit canals. Raphides of calcium oxalate occurring in large subrounded mucilage cells or scattered throughout the powder, needle crystals 18-88 mm long. Fibres in bundles, 11-30 mm in diameter, walls lignified, with V-shaped or ellipitcal pits. Scalariform, bordered pitted and spiral vessels 10-32 mm in diameter. Masses of gelatinzed starch granules colourless.
Processing Wash clean, soften thoroughly, cut into thin slices, and dried in the sun.
Action To arrest bleeding, and to promote the subsidence or swelling and the growth of new tissue.
Indications Hemoptysis in pulmonary tuberculosis, hematemesis in peptic ulcer, traumatic bleeding; boils and sores; rhagadia.
Usage and dosage 6-15 g, or 3-6 g to be ground into powder for oral administration; appropriate quantity for external use.
Precaution Incompatible with Radix Aconiti and allied drugs.
Storage Preserve in a ventilated and dry place.