Neottia cordata

The Neottia cordata, commonly known as the Lesser Twayblade or Heartleaf Twayblade, is a very small and inconspicuous terrestrial and herbaceous orchid, which is why it often goes unnoticed by the human eye. It belongs to the Orchidaceae family and was recently reclassified from the genus Listera to Neottia due to genetic studies. It is notable for its ability to grow hidden among moss, under heather, and in shady areas, contributing great ecological complexity despite its tiny size.

Morphological description: It is a tiny plant, typically standing between 5 and 20 cm tall (exceptionally up to 33 cm). Its stem, green to reddish-purple, is fleshy and glabrous (hairless) below the leaves, but has fine glandular hairs on the upper part. The most distinctive feature of this orchid is its two shiny dark green heart-shaped leaves (hence the Latin epithet cordata), arranged almost opposite each other in the middle of the stem. It produces a raceme-shaped inflorescence containing between 3 and 25 tiny flowers (2 to 3 mm wide each). The petals have yellowish-green, bronze, or reddish-purple tones. The lower petal or labellum is longer (3 to 6 mm) and is deeply divided into two narrow lobes, giving the flower a curious, small humanoid appearance.

Pollination and life cycle: To attract insects, the flowers secrete a small amount of nectar and emit a strong, repulsive odor, described as similar to 'decaying mollusks'. This scent particularly attracts small flies, beetles, wasps, and fungus gnats (such as Sciara thomae). The orchid has hairs that, when an insect approaches, 'shoot' a sticky substance to attach pollen sacs to the animal. Although it can self-pollinate, its sexual organs mature at different times to favor cross-pollination. It is a perennial plant that can live for several years. Like most orchids, it produces tiny seeds and relies heavily on an endomycorrhizal relationship with fungi (from the genera Rhizoctonia or the order Sebacinales). In addition to sexual reproduction, it can also reproduce vegetatively through rhizome shoots.

Habitat and distribution: This orchid primarily inhabits shady, cold, and humid forest areas with acidic soils, such as coniferous forests, swamps, bogs, and wet heaths. It thrives particularly well on Sphagnum moss cushions. It has a circumboreal and circumpolar distribution, extending across the northern Northern Hemisphere, including Scandinavia, Northern Asia, Canada, Alaska, and Greenland, and in higher, more mountainous latitudes further south (up to altitudes of 2,000 - 2,400 meters), such as the Alps, the Apennines, and the Rocky Mountains. In Catalonia, it has been documented on several occasions growing in the high mountains, mainly in the Ripollès region. Globally, the species is considered to be of Least Concern (LC). However, regionally, it is protected and listed as a Vulnerable (VU) species in countries like Sweden or endangered in certain North American states.