Loasa

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Loasa
Loasa vulcanica

Loasa vulcanica

Systematics
Nuclear eudicotyledons
Asterids
Order : Dogwood-like (Cornales)
Family : Nettle family (Loasaceae)
Subfamily : Loasoideae
Genre : Loasa
Scientific name
Loasa
Adans.

Loasa is a genus of plants withinthe nettle family (Loasaceae). The approximately 36 species are almost all found in Chile and Argentina .

description

Illustration of Loasa vulcanica
Flowering in detail of Loasa acerifolia
Flowering in detail of Loasa floribunda
Bloom in detail from Loasa insons , the stinging hairs are also clearly visible
Flowering in detail of Loasa tricolor subsp. placei

Vegetative characteristics

In Loasa TYPES comes to annual or perennial herbaceous plants rare small shrubs . They grow upright, rosette-shaped or climbing. The above-ground parts of the plant are covered with nettle hair. The primary root is thin or forms a thickened taproot or a tuber.

The leaves are either arranged opposite each other or alternate only in the lower half and in the upper half. The leaf blades are usually egg-shaped and pinnate, occasionally bipinnate. Occasionally the leaf blades are broadly ovate to approximately circular and approximately lobed to the shape of a hand.

Generative characteristics

The flowers are seldom solitary, mostly in terminal inflorescences that are dichasia or thyrsenic in shape . Under the mostly pendulous, in rosette-shaped growing species also upright, there are two frondose bracts .

The hermaphrodite flowers are radially symmetrical and usually five-fold with a double flower envelope . The sepals are durable. The mostly white, yellow or red petals are usually nailed. The outer staminodes are fused and form a scale sheet ("nectar scale"), on the outer side of which there are three long flag-shaped white, red or yellow appendages.

The cylindrical to approximately round capsule fruits open with three to five flaps at the top of the fruit. The seeds are egg-shaped, rarely large and round.

The number of chromosomes is 2n = 12, 24, 26 and 36, respectively.

distribution

The Loasa species are almost exclusively native to Chile and Argentina, with the exception of one species that is also found on the Peruvian coast.

Systematics

The genus Loasa was established by Michel Adanson in Familles des Plantes , 2, page 501 in 1763 . Type species is Loasa acanthifolia Desr.

The genus Loasa belongs to the tribe Loaseae in the subfamily Loasoideae within the family Loasaceae . The genus Loasa is closely related to the genera Caiophora , Scyphanthus and Blumenbachia . The genus Loasa was subdivided into several sections and series by Ignatz Urban and Ernest Friedrich Gilg in 1900, this subdivision is no longer used as it is. The genus is believed to be paraphyletic . Since 1997, many species have been outsourced to the Nasa genus .

The genus Loasa comprises about 36 species, including:

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

Individual evidence

  1. ^ Loasa at Tropicos.org. Missouri Botanical Garden, St. Louis, accessed on September 23, 2017.
  2. ^ A b c Loasa in the Germplasm Resources Information Network (GRIN), USDA , ARS , National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved September 23, 2017.

Web links

Commons : Loasa  - collection of pictures, videos and audio files