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drosera rotundifolia


drosera rotundifolia
Photo Information
Copyright: Catalin Josan (methos) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 213 W: 51 N: 281] (1189)
Genre: Plants
Medium: Color
Date Taken: 2007-04-26
Categories: River
Camera: Canon EOS Rebel XTi, Sigma 150mm F2.8 APO Macro DG HSM, HOYA 72mm UV
Exposure: f/9.0, 1/160 seconds
More Photo Info: [view]
Photo Version: Original Version
Date Submitted: 2007-04-26 10:55
Viewed: 4045
Points: 4
[Note Guidelines] Photographer's Note
Hi everybody,
For today a representative of one of my favorite group of plants: carnivorous.
This is a Drosera Rotundifolia.
# Drosera, from the Greek, droseros (droseros), "dewy, watery"
# rotundifolia, from the Latin, rotundus, "round, spherical" and folius, "leaf"; hence "round leaf"
# Common Name, from the shape of the leaf
# Other common names include: Common Sundew, Dew Plant, Red Rot, Round-leaved Sundew,

* An insectivorous, short-lived herbaceous perennial of open bogs.
* Leaves a basal rosette. Blades round, depressed, and lying flat on ground; ¼"-½" long and as wide or wider. Upper surface of blades covered with reddish, glandular hairs tipped with a sticky, glutinous secretion resembling a dewdrop that traps insects, hence its name. Petioles ¾"-2" long and covered with sticky hairs.
* Roots usually shallow (less than 2½"), consisting of a taproot, functional for less than a year, replaced by mostly horizontal adventitious roots with a few root hairs.
* Flower structure a one-sided raceme, with 2-15 flowers on a 2"-10" long stalk . There may be one to seven racemes per rosette.flowers which only open in the sunshine. Flower-stems erect, slender, 2 to 6" high, at first coiled inward bearing a simple raceme, which straightens out as flowers expand; these are very small and white, appearing in summer and early autumn.
o Sepals 5, 4mm-5mm
o Petals 5, white to pink; longer than sepals
o Stamens 5; shorter than petals
o Pistils of 3 styles
* Fruit a capsule with numerous small seeds.
* Seed tiny, light brown, and shiny, with fine lines; only about 1mm long.
* Compensates for the low available nutrients in its habitat by catching and digesting insects. Insects are caught with the sticky glandular leaf hairs, the leaf then folding around the prey. The hairs secrete proteolytic enzymes which digest the insect and enable the plant to absorb nutrients through its leaves. Insect capture is generally believed to enhance growth and reproduction. It is significantly correlated with total leaf number, number of new leaves formed, and total leaf area. The benefits of insectivory may be site dependent; sundew may benefit most from insect capture on the most nutrient-poor sites.
* This secretion is most abundant when the sun is at its height. These hairs are very sensitive, they curve inward slowly and catch any insects which alight on them; the fluid on the points also retains them. After an insect has been caught, the glandular heads secrete a digestive fluid which dissolves all that can be absorbed from the insect. It has been noted that secretion does not take place when inorganic substances are imprisoned.

Conservation

In the UK, it is a protected wild flower and therefore it is a criminal offence to remove all or part of one of these plants from the wild.

In North America, the roundleaf sundew is considered endangered in the U.S. states of Illinois and Iowa, exploitably vulnerable in New York and threatened in Tennessee.

Medicinal Properties

Drosera rotundifolia plant extracts show great efficacy as an anti-inflammatory and anti-spasmodic, more so than D. madagascariensis, as a result of the flavinoids such as hyperoside, quercetin and isoquercetin, but not the naphthoquinones present in the extracts. The flavinoids are thought to affect the M3 muscarinic receptors in smooth muscle, causing the antispasmodic effects. Ellagic acid in D. rotundifolia extracts has also been shown to have anti-angiogenic effects

Hope you like it!

PS this is also to celebrate my new lens :D

LordPotty, aprilush, herve1993 has marked this note useful
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Critiques [Translate]

Interesting shot of these Sundews Catalin.
I can appreciate how difficult it must have been to get the focus right,with all the spiky bits.
I see you've caught a wee bug there too.
Good shot,and a great note.
Thanks for posting.
Steve

Bonjour Catalin,
Magnifique photo de cette espèce très originale et emblématique de milieux très fragiles.
Salutations
Hervé

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