Common yarrow
A perennial meadow plant with finely divided foliage and flat-topped flower clusters.
Arnica montana
Русское название: Арника горная
A yellow-flowered plant associated with European mountain meadows, vulnerable to collection pressure in some regions. Internal use of arnica products can be dangerous. Local protected status should be respected.

Do not use photographs or online summaries to identify wild plants for eating or medicinal use. Some poisonous plants resemble edible species and even handling certain species can cause harm. If poisoning is suspected, contact your local poison service or urgent medical care. Do not wait for symptoms.
Poison Control: poisonous plants (US) ↗European mountain grasslands
Open mountain grassland and acidic soils
Images and brief descriptions are for learning, not for reliably identifying a specimen. Take particular care with poisonous plants and mushrooms.
Identification is never guaranteed by a photo. Scientific names are used to reduce confusion between local names.