Platanthera

Platanthera is a genus of orchids commonly known as rein orchids. The genus is found throughout much of the world, including North America, Europe, and Asia. Platanthera orchids are characterized by their fleshy, tuberous roots and their distinctive, often fragrant, flowers. The flowers typically have a spurred lip and are adapted for pollination by moths.

The genus Platanthera is divided into several subgenera and many species. Some well-known species include Platanthera grandiflora, the large purple fringed orchid, and Platanthera blephariglottis, the white fringed orchid, both native to eastern North America. Other species, such as Platanthera bifolia, the lesser butterfly orchid, are found across Europe and Asia.

These orchids often inhabit a range of environments, from moist woodlands and meadows to bogs and fens. Their ecological niche can be quite specific, and many species are considered sensitive to habitat disturbance. The conservation status of many Platanthera species varies, with some facing threats from habitat loss and over-collection.

Reproduction in Platanthera orchids relies heavily on insect pollination, primarily by moths attracted to their scent, which is often stronger at night. The seeds are minute and require a symbiotic relationship with specific mycorrhizal fungi for germination and initial growth, a common characteristic of orchids. The genus name Platanthera derives from Greek words meaning "broad anther," referring to the appearance of the anther cap.