This section is from the book "Sub-Alpine Plants Or Flowers Of The Swiss Woods And Meadows", by H. Stuart Thompson. Also available from Amazon: Sub-Alpine Plants: Or, Flowers of the Swiss Woods and Meadows.
A family of over 600 species spread over the greater part of the world, but chiefly in the tropics.
About 30 species in the hot and temperate regions of the ancient world.
This well-known parasitical plant is very common in Switzerland, growing not only on Apple, Poplar, Oak, etc., but also upon Fir and other Coniferous trees.
It ascends to at least 4000 feet in some of the pine forests.
Europe, Asia, N. Africa.