Rosyanka rotundifolia

Name: Rosyanka round-leaved

Round-leaved sundew (Drosera rotundifolia L.)

Rosyanka rotundifolia is a perennial plant from the Rosyankovye family (Droseraceae). Other names: dewdrop, dewdrop, sun dew.


A small perennial herbaceous plant with a basal rosette of open rounded green leaves, on long petioles, with one or less often several flower stems 10-15 cm tall, bearing a one-sided raceme of small white flowers. The leaves are covered with bright red hairs with capitate thickenings at the top, which secrete transparent droplets of sticky mucus. Blooms in June-August. Rosyanka is a peculiar plant with leaves adapted for catching insects. Touching a drop of mucus, the insect sticks to it, is captured by sensitive hairs and then digested by pepsi-like substances contained in the mucus. It lives in peat bogs, mainly sphagnum, on sphagnum moss cushions, in transitional bogs, wet peaty places, on the walls of ditches.

Harvesting, description of raw materials:

In medicine, sundew grass is used – Herba Droserae, which is harvested during flowering. Rosettes of dried leaves of previous years are torn off from the whole plant and dried in the shade. The raw material consists of the aerial part of the plant with a rosette of basal leaves. When dried, the leaves take on a reddish-brown color, there is no smell, the taste is astringent, sour-bitter. In the glandular heads, cells with red juice are visible. Blackened or dark brown grass is not allowed for use.

Contains active substances:

Sundew grass contains naphthoquinones plumbagin and drozeron, vitamin C, tannins, organic acids and anthocyanin pigment. Plumbagin at a dilution of 1:50,000 inhibits the growth of some pathogenic fungi and bacteria, with a particularly strong effect on whooping cough pathogens.

Medicinal use:

The herb has an antispasmodic effect and is used as an infusion for whooping cough, chronic bronchitis, laryngitis and other diseases. In folk medicine, they drink a decoction of the herb for nervous diseases, headaches, diphtheria, plague; alcohol tincture is drunk for malaria.

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