Drosera roseana
| Drosera roseana | ||||||||||||
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Drosera roseana , flower |
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| Scientific name | ||||||||||||
| Drosera roseana | ||||||||||||
| NGMarchant & Lowrie |
Drosera roseana is a carnivorous plant from the genus sundew ( Drosera ).
description
Drosera roseana is a perennial herbaceous plant . This species is a rosette-forming dwarf sundew and reaches a diameter of about 3 cm to just under 5 cm. New leaves rely on a bed of old leaf parts that grows relatively quickly, which means that the plant can reach a height of up to 3 cm after a while. Like all dwarf sundew species, Drosera roseana has a long, thin taproot, buttop roots are occasionally formed above ground. The petioles are about 5 mm long and 0.8 mm wide, the oval catch leaves about 3 mm. The color of the catch leaves varies from yellow-green to pink to deep red, depending on the lighting conditions.
Flowers are formed (in the Australian natural habitat) in the period from November to January. The hairy flower stem can be up to 5 cm long and has 20-30 rows of white, pink or orange flowers that grow very close together, which is typical of Drosera paleacea and its subspecies. The flowers themselves have a diameter of approx. 1 cm and have 5 oval petals that are no longer than 6 mm and, in rare cases, may have pink spots. A flower has 3-4 styles and 5 stamens . A flower can stay open for up to 3 days (even at night), giving off a slightly sweet smell.
The formation of brood scales is typical of dwarf sundewers : The slightly oval brood scales are formed in Australian autumn to winter (late April to June) when the length of daylight decreases. They have a length of approx. 1 mm with a width of 0.9 mm and a thickness of 0.6 mm. Catch leaves are rarely formed during this time and old leaves fold off on the side.
The growing season of Drosera roseana extends from September to late November in the Australian spring. In the dry summer, a relatively small stipule bud is formed in the base to protect the living parts of the plant .
The number of chromosomes is 2n = 6-8.
distribution
The distribution area extends in the southwest of Australia, west of Albany to Windy Harbor along the coast. In terms of climate, cool, humid winters prevail here with temperatures between 10 and 20 ° C and low rainfall (around 100 mm). Summer, on the other hand, is characterized by hot, dry summers with temperatures between 15 and 25 ° C and low rainfall (around 50 mm).
Systematics
By Allen Lowrie is drosera roseana regarded as a separate species, Jan Schlauer however, sees them as a subspecies of Drosera paleacea , bringing to his system the name Drosera paleacea subsp. roseana (NGMarchant & Lowrie) Smarter results.
literature
- Allen Lowrie: Carnivorous Plants of Australia. Volume 2. University of Western Australia Press, Nedlands 1989, ISBN 0-85564-300-5 .
Individual evidence
- ^ Drosera roseana at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
