Drosera intermedia
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| Drosera intermedia | ||||||||||
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| Drosera intermedia Hayne, 1800 |
Drosera intermedia, commonly known as the oblong-leaved sundew or spoonleaf sundew, is an insectivorous plant species belonging to the sundew genus. It is a temperate or tropical species native to Europe, southeastern Canada, the eastern half of the United States, Cuba and northern South America.
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[edit] Morphology
D. intermedia is a perennial herb which forms a semi-erect stemless rosette of spatulate leaves up to 10 cm tall. Plants in temperate regions undergo dormancy during which they form a winter resting bud called a hibernaculum.
As is typical for sundews, the leaf blades are densely covered with stalked mucilagenous glands which secrete a sugary nectar to attract insects. These then become ensnared by the mucilage and, unless they are strong enough to escape, are suffocated by the sticky goo or die from exhaustion. The plant then secretes digestive enzymes from sessile glands and later absorbs the resulting nutrient solution to supplement the poor mineral nutrition of the plants natural environment.
D. intermedia blooms from June through August, forming up to 15 cm. tall inflorescences bearing 3-8 white flowers. Fertilized ovaries swell to form egg-shaped dehiscent seed capsules which bear numerous tiny seeds.
[edit] Distribution and habitat
D. intermedia is one of the most widely distributed species in the genus, and one of only three Drosera species native to Europe (the others are D. rotundifolia and D. anglica). It is also found in eastern North America, Cuba, and northern South America. The Cuban and South American forms are tropical and do not form hibernacula in the winter.
D. intermedia grows in constantly moist to wet bogs, fens, and marshes. It prefers nutrient free soils - such as sphagnum peat moss or sandy ground - and open, sunny habitats.
[edit] References
- L. Diels: Droseraceae, 1906, 135 pages. (The only Monograph of the family Droseraceae to date.) -- is this true? "Insectivorous Plants" by Charles Darwin (see below), published 1875, mostly dealt with Droseraceae, and is certainly a Monograph.
- Barthlott, Wilhelm; Porembski, Stefan; Seine, Rüdiger; Theisen, Inge: Karnivoren, Stuttgart, 2004, ISBN 3-8001-4144-2
- Darwin, Charles; Insectivorous Plants (London: John Murray, 1875, 462 pages) Library of Congress Control-Number: 04001280; Replica reprints (Scotland: Langford Press, 2005(?), 462 pages) ISBN 1904078004; Non-Replica reprints (New York: New York University Press, 1990, 345 pages) ISBN 978-0814718223; Project Gutenberg online edition at http://www.gutenberg.org/etext/5765
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