Aa (plant)

Aa (plant)

Taxobox
name = "Aa"
regnum = Plantae
divisio = Magnoliophyta
classis = Liliopsida
ordo = Asparagales
familia = Orchidaceae
subfamilia = Orchidoideae
tribus = Cranichideae
subtribus = Prescottiinae
genus = "Aa"
genus_authority = Rchb.f., 1854
subdivision_ranks = Species
subdivision = See text

"Aa" Rchb.f. 1854, is a genus of plants belonging to 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 upside down flower with the lip at the top. This lip is fringed and hood-shaped. The flower gives off a pungent smell that attracts flies. This genus has often been confused with 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 palacea" Kunth (1806)., and later "Altensteinia palacea". In 1854 Heinrich Gustav Reichenbach renamed the genus "Alsteinia" into "Aa", including two species "Aa argyrolepis" and "Aa palacea". 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" [ cite web |url=http://falco.elte.hu/eoc/ParadisusBatavus.htm |title= Paradisus batavus |archiveurl=http://web.archive.org/web/20020219095614/http://falco.elte.hu/eoc/ParadisusBatavus.htm |archivedate=2002-02-19 ] . 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.

Species

*"Aa achalensis" Schltr. 1920 (Argentina)
*"Aa argyrolepis" Rchb.f. 1854 (Colombia to Ecuador)
*"Aa calceata" (Rchb.f.) Schltr. 1912 (Peru to Bolivia)
*"Aa colombiana" Schltr. 1920 (Colombia to Ecuador)
*"Aa denticulata" Schltr. 1920 (Colombia to Ecuador)
*"Aa erosa" (Rchb.f.) Schltr. 1912 (Peru)
*"Aa fiebrigii" (Schltr.) Schltr. 1912 (Bolivia)
*"Aa gymnandra" (Rchb.f.) Schltr. 1912 (Bolivia)
*"Aa hartwegii" Garay 1978 (Ecuador; Colombia; Venezuela)
*"Aa hieronymi" (Cogn.) Schltr. 1912 (Argentina)
*"Aa inaequalis" (Rchb.f.) Schltr. 1912 (Peru to Bolivia)
*"Aa leucantha" (Rchb.f.) Schltr. 1920 (Colombia to Ecuador)
*"Aa lorentzii" Schltr. 1920 (Argentina)
*"Aa macra" Schltr. 1921 (Ecuador)
*"Aa maderoi" Schltr. 1920 (Venezuela; Colombia; Ecuador)
*"Aa mandonii" (Rchb.f.) Schltr. 1912 (Peru to Bolivia)
*"Aa matthewsii" (Rchb.f.) Schltr. 1912 (Peru)
*"Aa microtidis" Schltr. 1922 (Bolivia)
*"Aa nervosa" (Kraenzl.) Schltr. 1912 (Chile)
*"Aa palacea" (Kunth) Rchb.f. 1854 (Costa Rica to Bolivia)
*"Aa riobambae" Schltr. 1921 (Ecuador)
*"Aa rosei" Ames 1922 (Peru)
*"Aa schickendanzii" Schltr. 1920 (Argentina)
*"Aa sphaeroglossa" Schltr. 1922 (Bolivia)
*"Aa trilobulata" Schltr. 1922 (Bolivia)
*"Aa weddeliana" (Rchb.f.) Schltr. 1912 (Peru to NW Argentina)

References

* [http://apps.kew.org/wcsp/qsearch.do World checklist of monocotyledons]
*W.E. Higgins (2006): "Selby Vignette: The Aa's of Orchids". [http://www.selby.org/index.php?src=gendocs&link=vig_aa&category=Research]
*H.G. Reichenbach. 1854. Xenia Orchidaceae. 1:18.
*R. Schlechter (1912): "Repertorium specierum novarum regni vegetabilis". Bd. XI S. 147ff. [http://www.botanicus.org/page/237313]

External links

* [http://www.chilebosque.cl/herb/anervo.html Pictures of Chilean "Aa nervosa" orchid]


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