Linseed (Flax)

October 9th, 2007

Family: Linaceae

Synonyms: flaxseed, common flax, lint bells, winterlien

Order: Linaceae

Description:The flax plant is erect growing, to 3 feet with slender stems and entire leaves. The leaves are glaucous green, slender lanceolate, 20-40 mm long and 3 mm broad. The flowers are pure pale blue, 15-25 mm diameter, with five petals. The fruit is a round, dry capsule 5-9 mm diameter, containing several glossy brown seeds shaped like an apple pip, 4-7 mm long, which is indehiscent. Linum is an erect annual herb with a glabrous stem and few branches, growing about 60cm in height and cultivated in most temperate and tropical regions. The stem bears alternate, sessile, simple entire lanceolate to oblong leaves. Each branch produces one or two violet-blue five-petalled flowers in a terminal cluster from June to August, and a globular capsule containing about ten seeds.In addition to the plant itself, flax may refer to the unspun fibres of the flax plant.

Parts used: ripe seeds and their expressed oil. Linseed oil, obtained from seed of the flax plant, is primarily used in industry; but some is used for edible purposes in eastern Europe.

Collection: when fully ripe in September.

Constituents: 30-40% fixed oil including linoleic, linolenic and oleic acids, mucilage (6%), protein (25%), the cyanogenic glycoside linamarine, bitter principle; the oil contains vitamins A, B, D and E, minerals and amino acids. The seeds contain around 35 to 44 percent of drying oil.

Use: Flax is grown both for its seed and for its fibres. Various parts of the plant have been used to make fabric, dye, paper, medicines, fishing nets and soap. It is also grown as an ornamental plant in gardens, as flax is one of the few plant species capable of producing truly blue flowers (most “blue” flowers are really shades of purple), although not all flax varieties produce blue flowers.

In eastern Europe, the seed is generally first cold pressed, the cold-press oil being used in foods. A later hot press yields additional industrial oil. In the U.S., oil extraction is generally hot press, followed by solvent extraction, and the oil is not used as food. The press cake from hot pressing is a valuable livestock feed. The flax seed contains a cyanogenic glucoside which forms hydrocyanic acid by enzyme action unless the enzyme is inactivated by heat. Flax seed for oil was grown in the U.S. on an average of about 2.7 million acres, 1964-66.
Flax fibers
Flax fibers are amongst the oldest fibre crops in the world. The use of flax for the production of linen goes back 5000 years. Pictures on tombs and temple walls at Thebes depict flowering flax plants. The use of flax fibre in the manufacturing of cloth in northern Europe dates back to Neolithic times. In North America, flax was introduced by the Puritans. Currently most flax produced in the USA and Canada are seed flax types for the production of linseed oil or flaxseeds for human nutrition.

Flax stem cross-section, showing locations of underlying tissues. Ep = epidermis; C = cortex; BF = bast fibres; P = phloem; X = xylem; Pi = pithFlax fibre is extracted from the bast or skin of the stem of flax plant. Flax fibre is soft, lustrous and flexible. It is stronger than cotton fibre but less elastic. The best grades are used for linen fabrics such as damasks, lace and sheeting. Coarser grades are used for the manufacturing of twine and rope. Flax fibre is also a raw material for the high-quality paper industry for the use of printed banknotes and rolling paper for cigarettes.

Medicinal Actions: demulcent, antitussive, gentle bulk laxative, emollient, anodyne, resolvent, relaxing expectorant, antiseptic, anti-inflammatory, locally drawing, soothing and healing, antitussive, pectoral

Indications: Respiratory catarrh, bronchitis, furunculosis, pleuritic pains

Therapeutics and Pharmacology: Linum may be used in all pulmonary infections, particularly where there is much catarrh, as in bronchitis. It is often applied as a poultice in pleurisy and other pulmonary conditions. A poultice may also be applied to boils and carbuncles, shingles, psoriasis and burns. Linum is also used in chronic or acute, atonic or spastic constipation. Whilst not a true laxative, it acts as a bulking and lubricating agent causing no irritation. Linseed oil is an valuable source of essential fatty acids which can help prevent the build-up of fatty deposits in the tissues. The oil has also been used to help the passage of gallstones.

Combinations: As a poultice for the chest Linum combines well with Sinapsis alba. For boils, localised swellings and inflammations it may be combined with Lobelia, Althaea root and Ulmus as a poultice.

Caution: Only the ripe seeds should be used; immature seeds can cause poisoning as they contain traces of prussic acid. Linseed oil deteriorates rapidly. It is important to stress to anyone taking linseed that at least two glasses of water should be taken at the same time to ensure proper swelling of the linseed in the stomach. In many cases where linseed appears to fail, the reason is that not enough fluid has been taken.

Preparation and Dosage:

Regulatory status GSL

Crushed or entire seeds: 3-6g or by infusion

Oil: 5-30ml, in vehicle, as a purgative

Additional Comments: As the source of linen fibre, Linum has been cultivated since at least 5000 BC; today it is mainly grown for its oil. It was used by the Egyptians to make cloth in which to wrap their mummies, and the Bible contains many references to the plant. The medicinal properties of the seeds were known to the Greeks and Hippocrates recommended them for inflammations of the mucous membranes. In 8th century France, Charlemagne passed laws requiring the seeds to be consumed to keep his subjects healthy. Linseed oil is used as a purgative for sheep and horses. Flax is obtained from the stem fibres. The oil has a number of uses in the paint and other industries. It is also used in cooking and has been recommended to help leach toxic heavy metals such as aluminium from the body.

Disclaimer:
The information presented herein is intended for educational purposes only. Individual results may vary, and before using any supplements, it is always advisable to consult with your own health care provider.

Resources:
http://www.purplesage.org.uk/profiles/linseed.htm
http://www.hort.purdue.edu/newcrop/Crops/Linseed_oil.html
http://en.wikipedia.org/wiki/Flax