Aa (plant)

Aa is a genus of plants of the family Orchidaceae.

Aa
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

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 paleacea Kunth (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.

Species

The following species of Aa are accepted[2]

Synonyms:
  • Aa hartwegii Garay 1978 (Ecuador; Colombia; Venezuela); syn., → Aa maderoi Schltr.,[8]
  • Aa gymnandra (Rchb.f.) Schltr. 1912 a synonym of Myrosmodes gymnandra (Rchb.f.) C.A.Vargas[9]
  • Aa inaequalis (Rchb.f.) Schltr. 1912 (Peru to Bolivia); a synonym of Myrosmodes inaequalis (Rchb.f.) C.A.Vargas[10]
  • Aa nervosa (Kraenzl.) Schltr. 1912 (Chile); accepted name Myrosmodes nervosa (Kraenzl.) Novoa, C.A.Vargas & Cisternas[11]

References
  1. "Paradisus batavus". Archived from the original on 2002-02-19.
  2. "World checklist of selected plant families".
  3. The Plant List: Aa
  4. Tropicos: Aa aurantiaca
  5. Tropicos: Aa figueroi
  6. Tropicos: Aa lehmanii
  7. Tropicos: Aa Lozanoi
  8. World Checklist of Selected Plant Families (WCSP)
  9. The Plant List: Aa gymnandra
  10. The Plant List: Aa inaequalis
  11. WCSP Aa nervosa (Kraenzl.) Schltr.
  • W.E. Higgins (2006): Selby Vignette: The Aa's of Orchids.
  • H.G. Reichenbach. 1854. Xenia Orchidaceae. 1:18.
  • R. Schlechter (1912): Repertorium specierum novarum regni vegetabilis. Bd. XI S. 147ff.
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