Chocolate cosmos

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Chocolate cosmos
Chocolate cosmos

Chocolate cosmos

Systematics
Order : Astern-like (Asterales)
Family : Daisy family (Asteraceae)
Subfamily : Asteroideae
Tribe : Coreopsideae
Genre : Kosmeen ( Cosmos )
Type : Chocolate cosmos
Scientific name
Cosmos atrosanguineus
( Hook. ) Voss

The cosmos atrosanguineus ( Cosmos atrosanguineus ) is a plant from the family of the daisy family (Asteraceae).

description

The chocolate cosmos is a perennial herbaceous plant that reaches heights of 40 to 60 centimeters. The flowering period extends from July to September. There are ray and tubular flowers in the cup-shaped inflorescences .

The plants come from a single clone worldwide that is reproduced through vegetative propagation . Since they are self-sterile, the plants cannot produce fertile seeds; they reproduce through fleshy tubers or are propagated in tissue culture . To ensure the conservation of the species, Kew Gardens stores the plant's formation tissues in liquid nitrogen .

Use and naming

Its scent, which is reminiscent of dark chocolate , unfolds in the late afternoon in warm summer weather. It is sometimes referred to as a chocolate flower, but differs from the real chocolate flower ( Berlandiera lyrata ) mainly in its flower color, which varies from a dark purple brown to dark red. Further German trivial names for Cosmos atrosanguineus are Black Cosmee , Fragrance Chocolate Flower or, like all species of the genus, Cosmos and small jewelry baskets .

history

The home of the cosmos is Mexico , but the exact place of origin is not known. Scientists believe that this species of plant originates from Zimapán , Hidalgo .

Hybrid Strawberry Chocolate variety in a Japanese garden

The cosmos was initially assigned to the two teeth ( Bidens ) and was first described in 1861 by Karl Eduard Ortgies as Bidens atrosanguineus (Hook.) Ortgies ex rule . William Jackson Hooker placed them in the new genus Cosmos in 1894 as Cosmos diversifolius var. Atrosanguineus Hook. ( Basionym ).

In 1835 William Thompson (1823–1903), founder of the Thompson & Morgan seed company, received seeds from Mexico and began to propagate them in his nursery in Ipswich , Great Britain. He left some seeds to Joseph Hooker at Kew Gardens . In the wild, the plant has been considered extinct since 1902, it is only cultivated as an ornamental plant. All plants come from offshoots from Kew Gardens. In 2010, fertile specimens of this plant were discovered in New Zealand, making it possible to breed crosses and new varieties.

maintenance

The chocolate cosmos needs sunny locations. The tuber is sensitive to frost, it must be removed from the ground in autumn and stored in a cool place. In the following spring it can be planted again. The propagation takes place via root cuts.

Individual evidence

  1. ↑ Wilkinson, T .; Wetten, A .; Prychid, C .; Fay, MF 2003 Suitability of cryopreservation for the long-term storage of rare and endangered plant species: a case history for Cosmos atrosanguineus. Annals of Botany 91/1, 65-74
  2. ↑ http://www.ipni.org/ipni/idPlantNameSearch.do?id=66736-2
  3. ↑ http://pacificbulbsociety.org/pbswiki/index.php/Cosmos
  4. ↑ http://www.lens.org/lens/patent/US_PP21879_P3

literature

Web links

Commons : Chocolate Cosmos  - Album with pictures, videos and audio files