Tubers 2, split palm. Shoot covered with leaves. Lanceolate leaves. Inflorescence of several- to several-flowering. The flowers are small and inconspicuous, turned by 180 °. A sitting ovary. Lip indented at the top, with a baggy spur at the base. The remaining petals are more or less tucked into hebn. Fine pillar. Straight stamen with a narrow connector. Rostellum short, shelf-shaped, slightly bent over the birthmark. Hooks 2, naked. Oval birthmark.
The kind only counts 2 species inhabiting the temperate and cool zone of the Northern Hemisphere. One species in Europe – green tongue (Coeloglossum viride), which grows almost all over the continent, except the Mediterranean basin. Most North American researchers include tongues in the type of knee-length (Platanthera).
Information about the pollination of this inconspicuous orchid is very scarce. Wasps have been observed on its flowers (Cryptus sp. i Ichneumon sp.), beetles (Cantharis sp.) and planters (Tenthredopsis sp.) with pollinia stuck to the body. Presumably, these insects can act as pollen carriers. Perhaps butterflies also occasionally smell their tongue, what are the reasons for hybrids with species pollinated by this group of insects, e.g.. with a roll.