Violet, lettuce, sow-thistle (Viola odorata), plate: Sweet violet
Sweet violet. Jacob Sturm, in J. G. Sturm, Deutschlands Flora in Abbildungen (1796 onward).
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Violet, lettuce, sow-thistle

Viola; lattuca; sonco

Known today as
Sweet violet (Viola odorata), garden lettuce (Lactuca sativa), sow-thistle (Sonchus oleraceus).
Kind
Plant, in 1 older authority
Constituents
lactucin and lactucopicrin, methyl salicylate glycosides, mucilage, and 1 more
Earliest authority here
Pliny (AD 23/24–79)
Qualities
FireEarthAirWaterCold and moist (Galenic tradition). What the degrees mean
In the Canale glossary
On the Manner of Discerning and Healing the Bewitched, Appendix A: Part Three, Chapters 7–8: The Bath and Fumigations

Revised October 1, 2026: An older authority added from a text read in full. Lore added from texts read in full. Version 1, first published September 25, 2026.

Violet, lettuce, sow-thistle: what did Canale use it for?

Cooling herbs, added to the bath for hot and dry complexions (ch. 7).

Violet, lettuce, sow-thistle: what does modern science say?

Mild herbs. Two bitter compounds of lettuce, lactucin and lactucopicrin, are sedative in mice.

Pharmacognosy & Toxicology

Constituents
Mechanism
Three cooling herbs of the bath: lettuce’s lactones are mildly sedative and analgesic in mice, the basis of the Victorian lettuce opium; the violet’s salicylates are anti-inflammatory; the sow-thistle is a bitter. In a bath they are a scent and a mucilage.
Toxic dose
Safe.
Standing
Violet has a traditional-use listing in France; lettuce and sow-thistle are foods.
  • Wesołowska, A., et al. (2006). “Analgesic and sedative activities of lactucin and some lactucin-like guaianolides in mice.” Journal of Ethnopharmacology 107. Verified against its record · doi:10.1016/j.jep.2006.03.003

Constituent names open the compound’s record at PubChem, and “ChEMBL” beside a name opens its record at ChEMBL, the European Bioinformatics Institute’s database of bioactive molecules. Where a mechanism line was checked against ChEMBL (ChEMBL 37, read 1 October 2026), the check is shown with the measured value and its source paper, or says plainly that nothing has been measured. Doses are as the references give them, for description only; this is not medical advice. Each source carries the result of its check against Crossref, PubMed, or the authority’s page: see Verification.

Violet, lettuce, sow-thistle: what lore surrounds it?

Folkard has the lettuce as the food of mourning: the ancients “employed it largely in their funeral repasts in commemoration of the death of Adonis, son of Myrrha, whom Venus had concealed in a bed of Lettuces,” and Eubulus “bitterly reproached his wife for having served up at a meal Lettuces, which were only recommended for funeral repasts.” In mediæval days “it was superstitiously thought that an evil spirit lurked in a bed of Lettuces,” whence perhaps the Richmond saying, “O'er-much Lettuce in the garden will stop a young wife's bearing.” Pliny held that lettuces “were thought to cause sleep,” and Pope has “Lettuce and Cowslip wine, probatum est.” The sow-thistle Theseus “is said to have received as a gift from the hands of Hecate,” and in Italian stories “Open Sow-thistle” works like Open Sesame. Of the violet, “according to Rapin, the Violet was once a fair nymph, who was changed by Diana into this flower to avoid the importunities of Apollo”; the Greek Ion was given “because, when Jupiter had metamorphosed Io into a white heifer, he caused sweet Violets to spring from the earth”; the Athenians preferred above all names that of “Athenian crowned with Violets”; and at the floral games of Toulouse the prize for the best poem “consisted of a golden Violet.”

Thiselton-Dyer has lettuce-beds as a haunt of spirits: “Evil spirits were once said to lurk in lettuce-beds, and a certain species was regarded with ill favour by mothers,” which may account for the Surrey saying, “O'er much lettuce in the garden will stop a young wife's bearing.” The sow-thistle “in Russia is said to belong to the devil,” yet in Italy mangers are decked at Christmas “with moss, sow-thistle, cypress, and holly.” The smooth sow-thistle and the garden lettuce both keep the flower-clock.

Grieve adds that violets were used by the Athenians “to moderate anger,” to procure sleep and “to comfort and strengthen the heart,” that Pliny “states that a garland or chaplet of Violets worn about the head will dispel the fumes of wine and prevent headache and dizziness,” that a Celtic poem recommends them “steeped in goats' milk to increase female beauty,” and that in the days of Charles II a conserve called “Violet Plate” “was considered of excellent use in consumption and was sold by all apothecaries.”

Used in These Compounds

Violet, lettuce, sow-thistle is an ingredient of 1 compound medicine in the database. For Club members. Create a free account or sign in.

Violet, lettuce, sow-thistle: what did the older authorities say?

Pliny
Of the violet: “Next after the roses and the lilies, the violet is held in the highest esteem,” in three kinds, the purple, the yellow, and the white; the purple, called ion, springs up of itself in sunny spots with a thin soil; and of the garland flowers the Romans of old knew “hardly any but the violet and the rose.”

Sources

  1. [121] Wesołowska, A., Nikiforuk, A., Michalska, K., Kisiel, W., & Chojnacka-Wójcik, E. (2006). Analgesic and sedative activities of lactucin and some lactucin-like guaianolides in mice. Journal of Ethnopharmacology 107(2): 254–258. doi:10.1016/j.jep.2006.03.003 Verified against its record · doi:10.1016/j.jep.2006.03.003
  • Pliny the Elder, Natural History 21.14, 21.10, trans. J. Bostock & H. T. Riley (1855), Perseus Digital Library. Primary text
  • Folkard, R. (1884). Plant Lore, Legends, and Lyrics, “Lettuce.” Project Gutenberg #44638. Primary text
  • Folkard, R. (1884). Plant Lore, Legends, and Lyrics, “Cowslip.” Project Gutenberg #44638. Primary text
  • Folkard, R. (1884). Plant Lore, Legends, and Lyrics, “Sow-Thistle.” Project Gutenberg #44638. Primary text
  • Folkard, R. (1884). Plant Lore, Legends, and Lyrics, “Violet.” Project Gutenberg #44638. Primary text
  • Thiselton-Dyer, T. F. (1889). The Folk-lore of Plants. Project Gutenberg #10118. Read in part · the text read
  • Grieve, M. (1931). A Modern Herbal, “Violet, Sweet.” botanical.com/botanical/mgmh/v/vioswe12.html Standard reference work

Verification

Checked
October 1, 2026
Passes
  • Every sentence read against its sources, in the pass over the remaining 343 entries
  • The Standing line checked against the authority it names (EMA, WHO, FDA, CITES, Commission E)
  • Every dated or regulatory claim checked by category across the database
  • Each quotation from the older authorities checked word for word against the text, read in full
Sources
9 cited: 1 read in part, 2 verified against its record, 5 primary text, 1 standard reference work.
Corrections
None were needed.

What was checked, how, and what was found is set out on the Verification page. A checked source is one whose record was found; it does not make the entry medical advice.

Cite This Entry

Version 1 · first published September 25, 2026 · last revised October 1, 2026

Chicago

“Violet, lettuce, sow-thistle.” In Materia Medica, edited by B. C. P. Statema. Version 1. The Thinking Press, 2026–. Last modified October 1, 2026. https://thethinkingpress.org/materia-medica/violet-lettuce-sow-thistle.

MLA

“Violet, lettuce, sow-thistle.” Materia Medica, edited by B. C. P. Statema, version 1, The Thinking Press, 1 Oct. 2026, thethinkingpress.org/materia-medica/violet-lettuce-sow-thistle. Accessed 8 Oct. 2026.

APA

Violet, lettuce, sow-thistle. (2026, October 1). In B. C. P. Statema (Ed.), Materia medica (Version 1). The Thinking Press. Retrieved October 8, 2026, from https://thethinkingpress.org/materia-medica/violet-lettuce-sow-thistle

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See Also

Sharing lactucin and lactucopicrin, mucilage, taraxasterol

Cichorium intybus · Borago officinalis · Polygonatum multiflorum · Tussilago farfara · Cydonia oblonga · Taraxacum officinale

Drawing on the same sources: Folkard, Thiselton-Dyer, Grieve

White hellebore · Wild rue · Snapdragon · Woody nightshade · Vinegar of the four thieves · Yarrow · the bibliography →

Nearby in the alphabet

Viper (Vipera species, dried into troches) · Vitriol (blue vitriol (copper sulfate), and white vitriol (zinc sulfate)) · Vinegar (Soured wine) · Vine ash (Ash of burnt vine wood) · The vernicle (leaving his image)

Historical description, not medical advice.