Educational film showing how a dodder grows - it is a plant which "strangles" others.
The Strangler - A Pro Patria presentation produced by British Instructional Films Ltd.
Microscope shot of a young dodder emerging from a seed pod. The shoot grips on to a piece of earth as it leaves the pod. Time lapse photography of the shoot growing. Time lapse of the dodder winding around a flax plant. C/U of suckers on inner side. Microscopic shot of the sucker. Microscopic cross section of a flax stem with the dodder twined around it. Graphics to illustrate how the dodder pushes fibres into the plant to draw food from it. Shot of flax plants that have been affected by the dodder. Stinging nettles being attacked by dodders filmed with time lapse. Time lapse of a clock placed by the plant to illustrate how fast the dodder grows. C/U of flowers of the dodder opening.
Intertitle reads: "All dodders are born stranglers"*. More time lapse film of the dodder entwining itself around plants. Shots of two dodders which are glowing close together "taking a friendly hold" of each other. Dodder attacking a different plant. C/U of stem of a plant with dodder twining around. Strangulation of a plant.
Note: Sound is poor on this print. May have been incorrectly spliced - seems to be out of sequence.
* intertitle is missing from version on *PM1397*, the intertitle should probably be at about 01:04:39.