Marsh Cudweed scientifically known as Gnaphalium uliginosum is a woolly annual plant belonging to Asteraceae ⁄ Compositae (Aster family) which also include ragweed, chrysanthemums, marigolds, daisies, and many others. It is widely used in the treatment of hypertension, insomnia, thrombophlebitis, phlebothrombosis and ulcers.
Marsh cudweed mostly used in herbal blends by herbalists. The herb contains essential oil with tannins, resins, flavonoids, alkaloids, phytosterols, carotene and vitamins C, A, B. 
Decoction and infusion of G. uliginosum are known to possess anti-inflammatory, astringent, and antiseptic properties.