Orchidaceae — Earth’s Most Beautiful Orchids

Brassia arcuigera -- the arching brassia

Brassia arcuigera — the arching brassia

Brassia arcuigera, the arching brassia, is a species of orchid. It is native to Honduras, Costa Rica, Panama, Colombia, Venezuela, Ecuador, and Peru.

Brassia is a genus of orchids classified in the subtribe Oncidiinae. It is native to Mexico, Central America, the West Indies, and northern South America, with one species (B. caudata) extending into Florida.

Brassia species and its popular hybrids are common in cultivation, and are notable for the characteristic long and spreading tepals, which lend them the common name spider orchid.

This epiphytic genus occurs in wet forests from sea level to altitudes under 1500 m, with the Peruvian Andes as its center of diversity. Occurrence is mostly restricted to a certain area, but Brassia caudata can be found over the whole geographic area.

They have large elliptic-oblong pseudobulbs with one or two leaves at the apex, lateral, unbranched many-flowered inflorescences with small floral bracts.

The lip is not attached to the column. The pollinarium shows a narrow stipe. There are two distichous, foliaceous sheaths around the base, from which the inflorescence emerges.

Brassia has a very specific method for pollination; it uses entomophily – pollination by insects – and in this case specifically by female spider-hunter wasps of the genera Pepsis and Campsomeris.

Mistaken by the mimicry of Brassia, the wasp stings the lip, while trying to grasp its prey without any success. By these movements the wasp comes into contact with the pollinarium, that then sticks to its head. By flying to another Brassia flower, this flower gets pollinated.

The Orchidaceae are a diverse and widespread family of flowering plants, with blooms that are often colourful and fragrant, commonly known as the orchid family.

Along with the Asteraceae, they are one of the two largest families of flowering plants. The Orchidaceae have about 28,000 currently accepted species, distributed in about 763 genera.

The determination of which family is larger is still under debate, because verified data on the members of such enormous families are continually in flux. Regardless, the number of orchid species is nearly equal to the number of bony fishes, more than twice the number of bird species, and about four times the number of mammal species.

The family encompasses about 6–11% of all seed plants.

The largest genera are Bulbophyllum (2,000 species), Epidendrum (1,500 species), Dendrobium (1,400 species) and Pleurothallis (1,000 species). It also includes Vanilla (the genus of the vanilla plant), the type genus Orchis, and many commonly cultivated plants such as Phalaenopsis and Cattleya.

Moreover, since the introduction of tropical species into cultivation in the 19th century, horticulturists have produced more than 100,000 hybrids and cultivars.