Aa | |
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Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Monocots |
Order: | Asparagales |
Family: | Orchidaceae |
Subfamily: | Orchidoideae |
Tribe: | Cranichideae |
Subtribe: | Cranichidinae |
Genus: | Aa Rchb.f., 1854 |
Species | |
See text |
Aa is a genus of plants of the family Orchidaceae.
Species in this genus can be found growing terrestrially in cold habitats near the snowline in the Andes and also in Costa Rica; they are usually found close to small streams. The elongated inflorescence grows from a basal rosette of leaves, terminating in a small white non-resupinate flower. This lip is fringed and hood-shaped. The flower gives off a pungent smell that attracts flies. This genus has often been included in the orchid genus Altensteinia .
The first scientific description of a species of this genus was made in 1815 by Karl Sigismund Kunth, naming it first Ophrys paleaceaKunth (1806)., and later Altensteinia paleacea. In 1854 Heinrich Gustav Reichenbach separated Aa from Altensteinia, to include two species Aa argyrolepis and Aa paleacea. The genus name apparently was rendered by the author to always appear first in alphabetical listings. Another – disputed – explanation, is that Heinrich Gustav Reichenbach named this genus after Pieter van der Aa; the printer of the Dutch botanist Paul Herman's "Paradisus Batavus". [1] A few years later, Reichenbach reviewed the name of the genus and named it again Altensteinia. Finally in 1912 Rudolf Schlechter switched the name again to Aa, as more species were being discovered making the new name more significant.
The following species of Aa are accepted [2]
Stanhopea is a genus of the orchid family (Orchidaceae) from Central and South America. The abbreviation used in horticultural trade is Stan. The genus is named for the 4th Earl of Stanhope (1781-1855), president of the Medico-Botanical Society of London (1829-1837). It comprises 55 species and 5 natural hybrids. These epiphytic, but occasionally terrestrial orchids can be found in damp forests from Mexico to Trinidad to NW Argentina. Their ovate pseudobulbs carry from the top one long, plicate, elliptic leaf.
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 extending into Florida.
Scaphosepalum is a genus of plants belonging to the family Orchidaceae. The species in this genus are mostly found in Central and South America, with one species extending into southern Mexico. By their genus name, many species in this genus produce unusual and distinctive flowers; some possessing cushion-like characteristics reminiscent of an African buffalo's horns, others possessing characteristics of snake fangs.
Schomburgkia was a genus of plants belonging to the family Orchidaceae. This genus was named for Richard Schomburgk, a German botanist who explored British Guiana during the 19th century. Former species of this genus were either epiphytic or lithophytic in their growth habit. According to the Royal Horticultural Society Schom. was the official abbreviation for this genus.
Barbosella is a genus of mostly creeping orchids. The genus has about 20 species, widespread across the West Indies and Latin America from Mexico and the Lesser Antilles to Argentina. Named after João Barbosa Rodrigues, an investigator of Brazilian orchids. They have solitary flowers with a unique lip base that works like a ball and socket.
Ponthieva is a genus in the orchid family (Orchidaceae), commonly known as the shadow witch. They are named after Henry de Ponthieu, an English merchant of Huguenot ancestry who sent West Indian plant collections to Sir Joseph Banks in 1778.
Altensteinia is a genus of orchids. It is found in the Andean region of South America. At present, eight species are accepted.
Cyrtochilum is a genus of flowering plant in the family Orchidaceae, native to the Caribbean and to South America from Costa Rica to Peru. The genus was established by Carl Sigismund Kunth in 1978.
Rodriguezia, abbreviated Rdza. in the horticultural trade, is a genus of orchids. It consists of 49 known species, native to tropical America from southern Mexico and the Windward Islands south to Argentina, with many of the species endemic to Brazil.
Brachystele is a genus of flowering plants from the orchid family, Orchidaceae. It consists of 20 species native primarily to South America but with a few species in Mexico, Central America, and Trinidad & Tobago.
Crossoglossa is a genus of flowering plants from the orchid family, Orchidaceae. It contains 26 currently recognized species native to Central America and South America, from Nicaragua to Bolivia.
Eltroplectris, the long-claw orchid, is a genus of flowering plants from the orchid family, Orchidaceae. It is native to South America, the West Indies, and Florida.
Myrosmodes is a genus of flowering plants from the family Orchidaceae, native to South America.
Psilochilus is a genus of flowering plants from the orchid family, Orchidaceae. It is native to South America, Central America, Mexico and the West Indies.
Pterichis is a genus of flowering plants from the orchid family, Orchidaceae. It is native to South America, Central America and Jamaica.
Pteroglossa is a genus of flowering plants from the orchid family, Orchidaceae. It is native to South America, Central America, and Mexico.
Sarcoglottis is a genus of flowering plants from the orchid family, Orchidaceae. It is widespread across much of Latin America from Mexico to Argentina, with one species extending northward into Trinidad and the Windward Islands.
Sauroglossum is a genus of flowering plants from the orchid family, Orchidaceae. The genus is endemic to South America. As of June 2014, the following species are recognized:
Aa argyrolepis is an orchid in the genus Aa. It grows at altitudes of 2,500 to 4,200 meters in Bolivia, Ecuador, Colombia and Peru.