Flax

Flax (also known as common flax or linseed) (Linum usitatissimum) is a type of  flowering plant.

The fibres of flax are used to make linen. High-quality paper used in banknotes is also made from flax fibres. A Vegetable oil (linseed oil) can be made from the dried ripe flax seeds. 
Flax has been used for a long time in such tasks as making bows and candles.

Toxicity
Flax seed and its oil are nontoxic and are safe for human consumption.

However, like many common foods, flax contains small amounts of cyanogenic glycoside. This is nontoxic when eaten in normal amounts. It may be toxic when eaten in large quantities as with staple foods such as cassava. The small percentage of cyanide can be removed by special processing.

 References 

Other websites

Category:Malpighiales
Category:Edible nuts and seeds
Category:National symbols of Belarus