Aosa
| Aosa | ||||||||||||
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Aosa rupestris |
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| Scientific name | ||||||||||||
| Aosa | ||||||||||||
| Little |
Aosa is a plant kind from the family of loasaceae (Loasaceae). It contains seven species that are native to South America.
description
These are shrubs or annuals or perennial herbaceous plants that are covered with nettle hairs. The lower leaves are opposite, the upper often spirally arranged. The leaf blades are oblong, ovate or approximately circular and simple or lobed with a notched or serrated edge.
The inflorescences are complicated, terminal and thyrsenic with dichasic or rarely monochasic paracladia . Pre-leaves are missing.
The petals are green to cream in color. The outer staminodes are fused and form a green and brown or red and yellow scale leaf ( nectar scale ), on the outer side of which there are three thread-like extensions, the tip either ends in three small lobes or is whole-edged and bent back.
The approximately round to club-shaped ovary is below or largely above, occasionally curved and opens with five flaps at the top of the fruit. The number of chromosomes is 2n = 24.
distribution
Six species are found in eastern Brazil , one in Hispaniola , one in Costa Rica .
Systematics
Aosa was first described in 1997 and 2006 as part of extensive systematic work on the family by Maximilian Weigend .
The genus is classified in the subfamily Loasoideae , Tribe Loaseae . The genus includes about eight species:
- Aosa gilgiana (Urb.) Weigend : It occurs in eastern Brazil.
- Aosa grandis (Standl.) RH Acuña & Weigend : It was first described from Costa Rica.
- Aosa parviflora (Schrad. Ex DC.) Weigend : It occurs in eastern Brazil.
- Aosa plumieri (Urb.) Weigend : It occurs in Hispaniola.
- Aosa rostrata (Urb.) Weigend : It occurs in eastern Brazil.
- Aosa rupestris (Gardner) Weigend : It occurs in eastern Brazil.
- Aosa sigmoidea Weigend : It wasfirst describedin 1999 from the Brazilian state of Minas Gerais .
- Aosa uleana (Urb. & Gilg) Weigend : It occurs in eastern Brazil.
proof
- Maximilian Weigend: Loasaceae. In: Klaus Kubitzki (Ed.): The Families and Genera of Vascular Plants . Volume 6: Flowering Plants, Dicotyledons: Celastrales, Oxalidales, Rosales, Cornales, Ericales . Springer, Berlin / Heidelberg / New York 2004, ISBN 3-540-06512-1 , pp. 248 (English, limited preview in Google Book search).
- Maximilian Weigend: Familial and generic classification. Online , accessed August 1, 2008
