PlantaeDB Logo
Login Sign-up

Genus Plocoglottis in Family Orchidaceae

In botanical taxonomy, a genus (plural genera) is a rank used to group closely related species within a family. In the hierarchy, genus sits below family and above species.

Genera are defined by shared morphological, anatomical, and genetic characteristics (for example, features of flowers, fruits, seeds, or leaves) that indicate a close evolutionary relationship among the species they contain.

Each genus can include one or more species. Examples include Rosa (roses) and Solanum (nightshades, including tomato and eggplant).

Do you wish to read more about plant taxonomy? Click here!

Genus Description

Suggest a correction!

Plocoglottis is an orchid genus (Orchidaceae, subfamily Epidendroideae) comprising roughly 30 accepted species (POWO, 2024; WFO, 2024). It ranges from the eastern Himalayas across Southeast Asia to New Guinea, primarily in lowland to mid‑elevation humid forests. The type species is Plocoglottis javanica (Blume) Blume.

The plants are terrestrial or lithophytic, with pseudobulbs bearing one or two leathery leaves that often have a membranous stipular sheath. Short racemes arise from the pseudobulb base and carry few, relatively small flowers. Flowers have a dorsal sepal, two lateral sepals and two lateral petals; the lip is three‑lobed, usually with a raised central callus and sometimes a pubescent surface. The slender, curved column bears a terminal anther; the ovary is inferior with three parietal placentas and the fruit is a capsule of minute dust‑like seeds.

Species richness peaks in the Malesian archipelago, especially on Borneo and the Philippines, where several taxa are endemic to montane cloud forests (van den Bergh et al., 2019). Mainland Southeast Asian populations occupy dipterocarp forests up to roughly 1500 m elevation (WFO, 2024). This distribution pattern mirrors other Coelogyninae genera (Chase et al., 2015), suggesting a diversification centre in the Sundaland–Wallacea transition zone.

Pollination is only fragmentarily documented; field observations suggest small flies or bees may act as vectors (Jones & Clements, 2002). Flowering occurs synchronously in the wet season, and seeds are wind‑dispersed.

Phylogenetic analyses place Plocoglottis within tribe Coelogyninae, but its exact sister relationships are unresolved (Chase et al., 2015; van den Bergh et al., 2019). No subgeneric sections are universally accepted; some authors informally group species by lip morphology (Jones & Clements, 2002). Global databases retain Plocoglottis as distinct, while some regional treatments have synonymised certain Philippine taxa under Eria; the synonymy remains contested.

The genus has limited economic importance. A few species with attractive flowers are occasionally cultivated by orchid enthusiasts, but large‑scale horticulture is lacking. No species are used for timber or noted as invasive weeds.

Habitat loss and forest fragmentation are the main threats, and many endemic taxa lack formal conservation assessments. Targeted field surveys and inclusion of Plocoglottis in regional Red‑List evaluations will be essential to safeguard its diversity.

Pick a Species to see its components: