Foxglove

Scientific

Digitalis contains ~20 species, most native to Europe, North Africa, and western Asia. Principal species:

• Digitalis purpurea — common foxglove; biennial; the species William Withering studied; bell-shaped pink-purple flowers on tall spikes
• Digitalis lanata — Grecian foxglove; the primary modern pharmaceutical source of digoxin

All parts of the plant contain cardiac glycosides — digoxin, digitoxin, and related compounds — that bind the sodium-potassium ATPase pump on cardiac muscle cells. The effect is to increase the strength of cardiac contraction while slowing the heart rate. The therapeutic window is famously narrow: doses slightly above therapeutic produce nausea, visual disturbances, and eventually fatal cardiac arrhythmia.

Cultural and medical history

Folk use of foxglove for “dropsy” (edema, often from heart failure) is documented across European traditional medicine for centuries. William Withering — physician at Birmingham General Hospital — encountered a folk remedy for dropsy from an old Shropshire woman whose herbal preparation worked when other treatments had failed. Withering identified foxglove as the active ingredient and spent the next decade systematically documenting dosing, timing, preparation, and clinical effect.

His 1785 An Account of the Foxglove and Some of its Medical Uses is one of the founding documents of modern pharmacology — and arguably the first systematic clinical trial in the modern sense. Withering’s careful documentation of patient outcomes by dose and preparation is methodologically far ahead of its 18th-century context.

Digoxin and related digitalis derivatives remained primary heart-failure medications through the 20th century. Modern heart-failure therapy now uses many other drug classes (ACE inhibitors, beta-blockers, SGLT2 inhibitors, ARNIs) — but digoxin still has specific indications and remains in the WHO Model List of Essential Medicines.

The folk-magical association of foxglove with fairies (the “folk’s glove” of fox-fairy traditions) reflects the plant’s combination of beauty and danger — a recurring symbol across British and Irish folklore.

See also

Auto-generated from this entry’s typed relations: frontmatter, grouped by relation type so the editorial signal isn’t flattened.

• Shares approach with: [[lily-of-the-valley]] · [[english-yew]] · [[caraway]] · [[cabbage]] · [[sweet-woodruff]] · [[st-johns-wort]]
• Member of: [[plants]]

Sources

• Wikipedia — Digitalis
• William Withering, An Account of the Foxglove and Some of its Medical Uses (1785)

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A plant entry in the 0mn1.one [[directory]].