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Genus of flowering plants in the borage family Boraginaceae

Pulmonaria (lungwort) is a genus of flowering plants in the family Boraginaceae, native to Europe and western Asia, with one species (P. mollissima) east to central Asia. According to various estimates there may be between 10 and 18 species found in the wild.

Lungworts are evergreen or herbaceous perennials that form clumps or rosettes. They are covered in hairs of varied length and stiffness, and sometimes also bear glands. The underground parts consist of a slowly creeping rhizome with adventitious roots. Flowering stems are unbranched, rough, covered with bristly hairs, usually not exceeding , with a few exceptions (P. mollis, P. vallarsae). The stems are usually upright, or slightly spreading. The plants reach in height, spreading up to wide. The leaves are arranged in rosettes. The blades are usually large, from narrowly lanceolate to oval, with the base ranging from heart shaped to very gradually narrowing, and can have a sharply pointed or blunt tip. The leaf margin is always entire, but in some species and forms can be rather wavy. Basal leaves are carried on stalks that can be short or longer than the leaf blade in various species. Stem leaves are smaller and often narrower, and are unstalked or clasping the stem. All leaves are covered with hairs that are usually bristly, or occasionally soft. The leaves are often prominently spotted in black and blue, or sometimes in pale green, or unspotted. The spots are due to the presence of foliage air pockets. These pockets, which cool the lower leaf surface, mask the presence of chlorophyll. The inflorescence is a terminal scorpioid cyme as a cymose corymb, with bracts, on short pedicels (stalks), reaching just above the foliage. The flowers are heterostylous, with two distinct forms of flower within each species; those with short stamens and long styles ("pin" flowers) and those with long stamens and short styles ("thrum" flowers), with the former usually being larger and more showy. The calyx is hairy, 5 lobed, tubular or funnel shaped, enlarging as the fruit ripens. The corolla is funnel shaped and consists of a long, cylindrical tube and a limb with five shallow lobes. Within the corolla throat, five tufts of hairs alternate with the stamens to form a ring. The colour of the corolla varies from purple, violet or blue to shades of pink and red, or sometimes white. The colour of the flower in bud is often pink to violet when they first emerge, which then changes to blue as the flower matures. The stamens and style are included within the corolla and not protruding. The nutlets are smooth, egg shaped, brownish, up to long and wide, each containing a single seed. Up to four nutlets per flower are produced, ripening mostly in summer.

Pulmonaria is a genus in the Boraginoideae subfamily of Boraginaceae, consisting of approximately 18 species, although species delineation (speciation) has proved problematic. Within the Boraginoideae, Pulmonaria is placed in the tribe Boragineae, where it is closely related to Borago.

The scientific name Pulmonaria is derived from Latin pulmo (lung). In the times of sympathetic magic, the spotted oval leaves of P. officinalis were thought to symbolize diseased, ulcerated lungs, and so were used to treat pulmonary infections. The common name in many languages also refers to lungs, as in English "lungwort", German Lungenkraut, French herbe aux poumons, Serbian plućnjak In some East European languages, the common name is derived from a word for honey, e. g. Russian medunitza, Polish miodunka, Serbian meduniče, Bulgarian "медуница".

The species of the genus are distributed across Eurasia.

Pulmonaria is an early spring flowering deciduous perennial, retaining its leaves till late winter, just before the new growth emerges.

Pulmonaria species are used as food plants by the larvae of some Lepidoptera species. These include the case bearer Coleophora pulmonariella, which feeds exclusively on P. saccharata, and the moth Ethmia pusiella, which has been recorded on P. officinalis.