Drosera sessilifolia

from Wikipedia, the free encyclopedia
Drosera sessilifolia
Plant in culture

Plant in culture

Systematics
Eudicotyledons
Nuclear eudicotyledons
Order : Clove-like (Caryophyllales)
Family : Sundew family (Droseraceae)
Genre : Sundew ( Drosera )
Type : Drosera sessilifolia
Scientific name
Drosera sessilifolia
A.St.-Hil.

Drosera sessilifolia is a carnivorous plant belonging to the genus sundew ( Drosera ). The plant grows widespread in South America.

description

Drosera sessilifolia , flower

Drosera sessilifolia is an annual, herbaceous plant with a short stem that grows as a down-to-earth to semi-upright rosette and reaches a diameter of 13 to 29 millimeters.

The yellowish and, with age, wine-red, sessile leaves are obovate, tapering at the base, blunt at the extreme end, 9 to 22 millimeters long and 3.5 to 10 millimeters wide. The rectangular stipules are membranous, end in seven fringes and are around 5 millimeters long and 1 millimeter wide.

The wine-red inflorescence is 10 to 22.5 centimeters long and hairless, it has up to 14 flowers . The bracts are linear, about 3.5 millimeters long and obsolete. The oblong-round sepals are 4 to 6 millimeters long and covered with glandular hairs, the petals are purple to pink. The five scars are divided into six cylindrical sections. The seeds are elliptical, the surface reticulate. The chromosome number is 2n = 20, reports of 2n = 80 as a number are presumably incorrect.

The number of chromosomes is 2n = 80.

ecology

Like many other sundew species, Drosera sessilifolia only blooms for a few hours in the early morning. It is extremely dependent on continuous full sun exposure, according to reports, a single cloud briefly covering the sun can cause the flowers to close.

distribution

Is home Drosera sessilifolia from northern Venezuela through Guyana to northwestern Brazil and is considered the after Drosera communis most widely Sonnentauart South America. Other possible countries in which they occur are countries neighboring Brazil such as Bolivia, Colombia, Peru and Suriname. Regardless of its wide distribution, the species is extremely rare, as it only thrives in small-scale locations with very special conditions.

Systematics and botanical history

The species was first described by Auguste de Saint-Hilaire in 1824 , the holotype comes from a collection from a Sertão near the Rio São Francisco in Minas Gerais . George Bentham described a Drosera dentata from Guyana in 1842 , which Ludwig Diels synonymized with Drosera sessilifolia in 1906 .

Together with the morphologically extremely similar and closely related Drosera burmanni , it forms the subgenus Thelocalyx of the sundew.

proof

  1. ↑ a b c d Fernando Rivadavia: Drosera sessilifolia St. Hil. Flower Saga. In: The New Zealand Carnivorous Plant Society Journal. Vol. 19, No. 3, 2000, ISSN  1175-6144 , pp. 3-6.
  2. ↑ a b Fernando Rivadavia: Drosera sessilifolia. In: Carnivorous Plant Newsletter. Vol. 25, No. 1, 1996, pp. 26-29 .
  3. ↑ a b c Mireya D. Correa A., Tânia Regina dos Santos Silva: Drosera (Droseraceae) (= Flora Neotropica. 96). New York Botanical Garden, New York NY 2005, ISBN 0-89327-463-1 , pp. 55-56.
  4. ↑ Fernando Rivadavia: New chromosome numbers for Drosera L. (Droseraceae). In: Carnivorous Plant Newsletter. Vol. 34, No. 3, 2005, ISSN  0190-9215 , pp. 85-91 .
  5. ↑ Drosera sessilifolia at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
  6. ↑ a b Ludwig Diels : Droseraceae (= The Plant Kingdom . 26 = 4, 112, ZDB -ID 846151-x ). Engelmann, Leipzig 1906, p. 74.

Web links

Commons : Drosera sessilifolia  - album with pictures, videos and audio files