Chrozophora is a genus of flowering plants in the family Euphorbiaceae, placed within the order Malpighiales. It was first formally described as a genus in 1824 and currently comprises around six accepted species. Members of the genus are monoecious herbs or undershrubs — relatively small, often annual or perennial plants with separate male and female flowers on the same individual. The genus is distributed broadly across the Old World, with species found in the Mediterranean basin, the Sahara and Sahel regions of Africa, the Middle East, the Indian subcontinent, Central Asia, and extending into Southeast Asia.
The most historically significant member of the genus is Chrozophora tinctoria, which was the source of a blue-purple dye known as "turnsole." This colorant was widely used in medieval Europe as a pigment in illuminated manuscripts and also served as a food colorant. Other notable members include Chrozophora plicata, which ranges from Sub-Saharan Africa and the Arabian Peninsula through to Java, and Chrozophora oblongifolia, found from East Africa through the Middle East to the Indian subcontinent. The genus formerly included species now reassigned to Codiaeum and Mallotus.
Distribution
Chrozophora species are distributed across Europe, Africa, and Asia. The Mediterranean and Middle Eastern regions host C. tinctoria; the Sahara and Sahel regions and Cape Verde host C. brocchiana; the Indian subcontinent, Afghanistan, and Indochina host C. rottleri; and C. plicata extends from Sub-Saharan Africa through the Arabian Peninsula to Southeast Asia and Java.
Cultural Uses
Chrozophora tinctoria was historically cultivated or harvested for its blue-purple pigment, known as "turnsole" or "folium," which was extracted from its fruits. This pigment was used extensively in medieval Europe as a colorant in illuminated manuscripts and as a food dye, making it one of the few plant genera with a documented role in the history of European art and food production.
