What kind of flower is this (→o←)? Detail point

The house rolls silk, the scientific name is flowers growing on the roof, also called spider's nest, hen and chicken.

Longevity flowers on the roof are mostly used for ornamental, edible and medicinal purposes. It is attached to the ground with roots and leaves containing sedative mucus, and can treat small area burns and insect bites.

Leaves can be mixed with salad, added to bath water to nourish the skin, and tea can be used to treat throat ulcers, oral diseases and bronchitis. In addition to its lovely appearance, the longevity flower on the roof is also considered to have the function of preventing witchcraft and lightning strike in Europe. Charlemagne once ordered residents to plant them on the roofs.