Aa ( lat. Aa ) - a genus of plants of the Orchidaceae family (subfamily Orchidoideae , tribe Cranichideae ). The genus includes 25  species native to the Andes ( Argentina , Colombia , Ecuador , Peru , Bolivia , Venezuela , Chile , Costa Rica , Panama ) on the border of a snow line near mountain streams .
|International scientific name|
Aa Rchb.f. (1854)
- 1 Name
- 2 Biological Description
- 3 Types
- 4 notes
The first scientific description of species of the genus was made in 1815 by Karl Sigismund Kunt , who renamed the genus Alsteinia to Aa , including two species, Aa argyrolepis and Aa paleacea .
The genus is named, according to one version, in honor of Peter van der Aa (1659-1733), the Dutch publisher of books and maps, in gratitude for the fact that in 1698 he printed the book Paradisus Batavus of the Dutch botanist Paul Herman , who died in 1695 . According to another version, the genus is named so in order to always be the first in alphabetical order.
The name of this genus is one of the two, along with Io ( Io B. Nord. , 2003 ), the shortest valid names for the genera of vascular plants according to the Germplasm Resources Information Network ( GRIN )  .
Representatives of the genus are herbaceous plants with elongated inflorescences growing from the main outlet , ending with a small white overturned flower with a lip at the top. This lip has the shape of a hood . The flowers emit a pungent odor that attracts flies .
According to the database of The Plant List , the genus includes 25 species  :
- Aa achalensis Schltr. (1920) (Argentina)
- Aa argyrolepis Rchb.f. (1854) (Colombia and Ecuador)
- Aa aurantiaca D. Trujillo
- Aa calceata ( Rchb.f. ) Schltr. (1912) (Peru, Bolivia)
- Aa colombiana Schltr. (1920) (Colombia and Ecuador)
- Aa denticulata Schltr. (1920) (Colombia and Ecuador)
- Aa erosa ( Rchb.f. ) Schltr. (1912) (Peru)
- Aa fiebrigii ( Schltr. ) Schltr. (1912) (Bolivia)
- Aa hartwegii Garay (1978) (Colombia, Ecuador, Venezuela)
- Aa hieronymi ( Cogn. ) Schltr. (1912) (Argentina)
- Aa leucantha ( Rchb.f. ) Schltr. (1920) (Colombia, Ecuador)
- Aa lorentzii Schltr. (1920) (Argentina)
- Aa macra Schltr. (1921) (Ecuador)
- Aa maderoi Schltr. (1920) (Colombia, Ecuador, Venezuela)
- Aa mandonii ( Rchb.f. ) Schltr. (1912) (Peru, Bolivia)
- Aa matthewsii ( Rchb.f. ) Schltr. (1912) (Peru)
- Aa microtidis Schltr. (1922) (Bolivia)
- Aa nervosa ( Kraenzl. ) Schltr. (1912) (Chile)
- Aa paleacea ( Kunth ) Rchb.f. (1854) (Costa Rica, Bolivia)
- Aa riobambae Schltr. (1921) (Ecuador)
- Aa rosei Ames (1922) - Aa Rose (Peru)
- Aa schickendanzii Schltr. (1920) (Argentina)
- Aa sphaeroglossa Schltr. (1922) (Bolivia)
- Aa trilobulata Schltr. (1922) (Bolivia)
- Aa weddeliana ( Rchb.f. ) Schltr. (1912) (Peru and northeast of Argentina)
- For the conventionality of indicating the class of monocotyledons as a superior taxon for the plant group described in this article, see the APG Systems section of the Monocotyledonous article .
- Aa (English) . The Plant List . Version 1.1. (2013). Date of treatment January 2, 2017.
- Genusno (Gender Numbers) (English) (dbf). Germplasm Resources Information Network ( GRIN ). Date of treatment May 18, 2012. Archived March 21, 2013.