Viola tricolor

Flowers of Viola tricolor

Viola tricolor is a small plant of creeping and ramping[lower-alpha 1] habit, reaching at most 15 cm (6 ins) in height, with flowers about 1.5 centimetres (0.59 in) in diameter. It grows in short grassland on farms and wasteland, chiefly on acid or neutral soils. It is usually found in partial shade. Its root is of the rhizome type with fine rootlets. The stem (acoli stem: which remains flush with the soil and from which leave the leaves and the flowering stalk) is hairless, sometimes downy and is branched. The plant has no leaf rosette at the base, unlike some other violets, such as Viola hirta. Leaves are, on the contrary, alternate. They are stalked at limbus oval, oblong or lanceolate and more or less serrated margins. The stipules are often quite developed, at least those of the upper leaves. These stipules are palm-lined or palmatised.

The flowers are solitary and lateral, hoisted on long peduncles. They appear on aerial stems with more or less long internodes. The sepals are never larger than the corolla. It is 10 to 25 mm long. This corolla can be purple, blue, yellow or white. It can most often be two-tone, yellow and purple. The tricolor shape, yellow, white and purple, is the most sought after.

It flowers from April to September (in the Northern Hemisphere). The plants are hermaphrodite and self-fertile, pollinated by bees.[1]

It is common almost everywhere on the Eurasian continent, near the sea or inland, at altitudes ranging from 0 to 2,700 m. It grows in open grasslands, wastelands, mainly on acidic or neutral soils. It is also found on the banks and in the alluviums.

As some of its names imply, V. tricolor has a long history of use in herbalism and folk medicine, both for epilepsy, skin diseases and eczema,[2] and for respiratory problems such as bronchitis, asthma, and cold symptoms.[3]

It is also a diuretic,[4] leading to its traditional use for rheumatism and cystitis.[5][6]

The flowers have also been used to make yellow, green and blue-green dyes,[7] while the leaves can be used to indicate acidity.

V. tricolor is one of many viola plant species containing cyclotides. These small peptides have proven to be useful in drug development due to their size and structure giving rise to high stability. Many cyclotides, found in Viola tricolor are cytotoxic.[8] This feature means it could be used to treat cancers.[9][8] Extracts from the plant are anti-microbial.[10] V. tricolor extract had anti-inflammatory effect in acute inflammation induced in male Wistar rats.[11] The plant, especially the flowers, contains antioxidants and is edible.[12]

Heartsease contains flavonoids (such as quercetin, luteolin and rutin), colorless crystalline compounds[13] proven to be useful in prophylaxis, and in treatment of cardiovascular problems, complications of diabetes, inflammations, immune disorders, and liver problems, among other indications. It also contains 10 percent mucilage, consisting of glucose, galactose, arabinose and rhamnose, as well as tannins, salicylic acid, and its derivatives.

Flower

In addition, it contains the drug phenolcarboxylic acids, such as coffee and coumaric acid. Various carotenoids have been isolated from the drug: violaxanthin, antheraxanthin, lutein, zeaxanthin and beta-Carotene. Anthocyanidins and coumarins, such as umbelliferone, could also be detected. The wild pansy contains—contrary to earlier references—no saponins, but hemolytically active peptides.[14] Plants contain aglycones: apigenin, chrysoeriol, isorhamnetin, kaempferol, luteolin, quercetin[15] and rutin.[16]

The fresh plant Viola declinata and V. tricolor contains approximately:

• saponins (4.40%),
• mucilages (10.26%),
• total carotenoids (8.45 mg/100g vegetal product, expressed in β-carotene).[17]

Neuroblastoma, a type of cancer,[18] is the most common extracranial malignancy in childhood. In many patients, once the tumor starts to develop it will continue to progress, even given intensive therapy. A study was designed to see the effect of Viola tricolor against neuronlastoma N2a cells. In the end, there was no significant change to the cell at first glance. As an ornamental and medicinal plant, the wild pansy has been cultivated since the Middle Ages and bred in Britain since 1810.[19]

According to Roman mythology, the wild pansy turned into the Love-in-idleness as Cupid shot one of his arrows at the imperial votaress, but missed and instead struck it. As Cupid is the god of desire, affection and erotic love, the flower’s juice received the trait, to act as a love potion. Its name relates to the use of the flower, as it is often used for idleness or vileness acts.

According to Greek mythology, Zeus fell in love with a young woman named Io and provoked jealousy to his wife Hera. He transformed the girl into a heifer and kept her grazing at his feet. For pity on the diet of herbs to which he submitted the beloved, he caused the earth to produce beautiful flowers that he called Io. Another Greek legend has it that the delicate white flowers were worshiped by Eros. To inhibit this worship, Aphrodite colored them, which resulted in tricolor coloration.

The ancient Greeks and Chinese used the vials as medicine, and the Celts and Romans made perfumes of them.

On a dry grassland.

Long before cultivated pansies were released into the trade in 1839, V. tricolor was associated with thought in the "language of flowers", often by its alternative name of pansy (from the French pensée, "thought"): hence Ophelia's often quoted line in Shakespeare's Hamlet, "There's pansies, that's for thoughts". (What Shakespeare had in mind was V. tricolor, the wild pansy, not a modern garden pansy.)

The Taming of the Shrew

Shakespeare mentions it in his play The Taming of the Shrew where Luciento claims he found the effect of love-in-idleness - alluding to its qualities to simulate the effects of love.

O Tranio! till I found it to be true,
I never thought it possible or likely;
But see, while idly I stood looking on,
I found the effect of love in idleness;
And now in plainness do confess to thee,
That art to me as secret and as dear
As Anna to the Queen of Carthage was,
Tranio, I burn, I pine, I perish, Tranio,
If I achieve not this young modest girl.

— The Taming of the Shrew (Act 1, Scene 1)

Purple flower.

• Viola arvensis — species also sometimes called "heartsease"
• Viola lutea — species also sometimes called "heartsease"
• Viola ocellata — species also sometimes called "heartsease"

Wikispecies has information related to Viola tricolor.

Wikimedia Commons has media related to Viola tricolor.

• Heartsease Maude Grieve
• Links to images, collected by the Texas A&M University Bioinformatics Working Group
• Species information in the Plants for a Future database
• Integrated Taxonomic Information System: Viola arvensis
• Viola tricolor Flowers in Sweden