Drosera linearis
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Drosera linearis |
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Drosera linearis is a carnivorous plant of the genus sundew ( Drosera ).
description
Drosera linearis is a perennial, herbaceous plant , in winter it retreats into a hibernacle .
The 2 to 5 centimeters long, upright leaf stalks are hairless and flattened and go into 3.5 to 6 centimeters long and 2 millimeters wide, linear leaf blades . In English the species is called "Linear-leaved Sundew". The one or two hairless inflorescences reach a height of 5 to 12 centimeters and carry up to eight flowers per inflorescence. These sit on 0.5 to 2 millimeter long flower stalks.
The flowers are five-fold and up to one centimeter in diameter. They appear from mid-July to mid-August and are self-pollinating . The elongated-elliptical sepals are 4 to 5 millimeters long and about 1.5 millimeters wide. The inverted egg-shaped petals are white and occasionally pale pink at the tips. They are up to 6 millimeters long and 3 to 4 millimeters wide. The flowers have three each 2 millimeters long pen , orange anthers and pollen . The approximately 0.5 to 1 millimeter large black seeds are oblong to inverted egg-shaped.
The number of chromosomes is 2n = 20.
Distribution and habitat
Along with Drosera filiformis, Drosera linearis is the only sundew species that is found exclusively on the North American continent. Their occurrences stretch from Minnesota over their main distribution area in the area of the Great Lakes and the extreme northeast of the USA ( Maine ) to Canada ( Ontario , south of Québec , Newfoundland ).
Drosera linearis appreciates open, wet locations and also grows in water up to 3 cm deep, but does not survive prolonged flooding. It mostly occurs in so-called "marl fens", a sand-based wetland covered with a mixture of peat and marl , a sediment of clay and limestone. It is the only Drosera that thrives well in this mostly alkaline substrate. This biotope is often surrounded by acidic peat moss hills, where the species is rarely found. There, however, the long-leaved sundew and the round-leaved sundew often grow in company , with which it occasionally forms sterile hybrids. This process led to the formation of the species Drosera anglica .
swell
Donald Schnell: Drosera linearis, Carnivorus Plant Newsletter Vol.9 n.1 (1980), p.16-18 (PDF)
literature
- Ludwig Diels : Droseraceae (= The Plant Kingdom . 26 = 4, 112, ZDB -ID 846151-x ). Engelmann, Leipzig 1906, p. 91.
- Donald E. Schnell: Carnivorous Plants of the United States and Canada. 2nd edition. Timber Press, Portland OR 2002, ISBN 0-88192-540-3 , pp. 256-260.
Individual evidence
- ^ Drosera linearis at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
