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Tussilago farfara
Coltsfoot is a perennial herbaceous plant that spreads by seeds and rhizomes. Tussilago is often found in colonies of dozens of plants. The flowers, which superficially resemble dandelions, appear in early spring before dandelions appear. The leaves, which resemble a colt's foot in cross section, do not appear usually until after the seeds are set. Thus, the flowers appear on stems with no apparent leaves, and the later appearing leaves then wither and die during the season without seeming to set flowers. The plant is typically between 10 - 30 cm in height.
Coltsfoot is used as a food plant by the larvae of some Lepidoptera species including The Gothic and Small Angle Shades. The Coltsfoot is also worked by the honey bee (Apis mellifera mellifera). Coltsfoot has also become a popular confectionery product made by using Coltsfoot essence to create a hardened rock that is used to soothe sore throats and chesty coughs; the recipe has been developed exclusively by Stockley's Sweets of Oswaldtwistle, UK and has become a favourite medicinal sweet around the globe known simply as Coltsfoot rock.
nothing is just weed, you have got there a very important and old medical plant! :) since 6000 years they are used in the chinese medicine, as an important herb against asthma, coughing, bronchitis (tea of leaves and smoke)
I heard that since middle age the flowers is used as a tea, to modulate the immune system