Nasa (genus)

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NASA
Nasa triphylla

Nasa triphylla

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

Nasa is a genus of plants withinthe nettle family (Loasaceae). With around 100 species spread from Central to South America, it is the most species-rich genus of the Loasaceae family.

description

Illustration from Curtis's botanical magazine , panel 3057 from Nasa urens

Vegetative characteristics

At Nasa TYPES is shrubs , half-shrubs or annual to perennial herbaceous plants reach stature heights from 5 to 400 centimeters. The primary root gradually recedes as it grows ; in fully grown plants, only adventitious roots can be found that grow from the trunk that lies on the ground. The above-ground parts of the plant are covered with nettle hair.

The leaves are arranged opposite or alternate. The leaf blades are ovate or circular and lobed, palmate or pinnate to multiply pinnate, sometimes umbrella-shaped.

Generative characteristics

The terminal inflorescences are thyrsenic with dichasic or monochasic . Under each flower there is a recalculating bract .

The hermaphrodite flowers are radially symmetrical with a double flower envelope . The petals are white, yellow, orange or red and often two-colored. The outer staminodes are fused and form a scale leaf ( nectar scale ), on the back of which there are up to three calli , which, however, can also be winged at the tip and provided with nectar bags on the outer side. The inner staminodes are L-shaped, at their base there are occasional outgrowths. The placentas are simple.

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

Chromosome sets and ingredients

The number of chromosomes is 2n = 28 or 56.

The seeds of the NASA species have high levels of pharmaceutically interesting fatty acids ( gamma-linolenic acid and stearidonic acid ).

Occurrence

The genus Nasa has its center of diversity in Colombia, Peru and Ecuador. A few species are also found in Chile, Bolivia and Venezuela as far as Central America and southern Mexico. The majority of Nasa species thrive in cloud forests, some species are weeds on cultivated land, but a few also in semi-deserts, coastal forests, rain forests and other zones.

Systematics

Nasa triphylla
Nasa urens

In 1997, after extensive systematic work on the Loasaceae family in Maximilian Weigend's doctoral thesis, it was determined that a new genus is required for a large number of species that were previously classified under Loasa ; it was published by NASA , albeit invalid, in Nasa and the Conquest of South America , page 214. The genus Nasa was only published in 2006 in Taxon , Volume 55, Issue 2, page 465. Type species is Nasa rubrastra (Weigend) Weigend (Syn .: Loasa rubrastra Weigend ).

The genus Nasa belongs to the tribe Loaseae in the subfamily Loasoideae within the family Loasaceae .

The genus Nasa contains around 100 species:

proof

literature

  • 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 at the FU Berlin. , last accessed on September 25, 2017

Individual evidence

Most of the information in this article has been taken from the sources given under references; the following sources are also cited:

  1. ↑ K. Aitzetmüller et al .: Seed Oil Fatty Acids of Loasaceae. In: J. Amer. Oil Chem. Soc. Volume 81, 2004, pp. 259-263.
  2. ↑ International Code Of Botanical Nomenclature (Vienna Code), Art. 30.5, Ex. 10, Online
  3. ^ Nasa at Tropicos.org. Missouri Botanical Garden, St. Louis, Retrieved September 25, 2017.
  4. ^ Nasa in the Germplasm Resources Information Network (GRIN), USDA , ARS , National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved September 25, 2017.
  5. ↑ Maximilian Weigend: Familial and generic classification , online at the FU Berlin. , last accessed on September 25, 2017

Web links

Commons : Nasa  - collection of images, videos and audio files