Hybrids of the two butterfly-orchids are rare, as are those between Lesser Butterfly-orchid and other species.

Lesser Butterfly-orchid and Fragrant Orchid also occur here, and at only one other Avon site each.

Heath Spotted-orchid, Lesser Butterfly-orchid and Adder's-tongue have been recorded.

The Lesser Butterfly-orchid occupies a wide range of habitats, being far more tolerant of acid conditions than the Greater Butterfly-orchid.

Rare and endangered plants that grow here include: star sedge (Carex echinata) and Lesser Butterfly-orchid (Platanthera bifolia).

On the Streckelsberg: Common Twayblade, Lesser Butterfly-orchid, Bird's-nest Orchid and Red helleborine.

Meadows are home to orchids, for example, Orchis coriophora (Bug orchid), Military orchid, Green-winged orchid, Epipactis helleborine, Lesser butterfly-orchid, and others.

Platanthera bifolia, commonly known as the Lesser Butterfly-orchid, is a species of orchid in the genus Platanthera, having certain relations with the genus Orchis, where it was previously included and also with the genus Habenaria.

Pwll-y-wrach wood is designated a Site of Special Scientific Interest (SSI) because of its special habitat values and the existence of some quite rare plants, including the small leaved Lime tree and the Lesser butterfly-orchid.

Platanthera bifolia Rich.

Rare and endangered plants that grow here include: star sedge (Carex echinata) and Lesser Butterfly-orchid (Platanthera bifolia).

There occurs: daphne mezereum, red elderberry, hazel, platanthera bifolia, sweet woodruff, herb paris, cranberry, wood sorrel, chickweed wintergreen, Common Cow-wheat and lily of the valley.