Colchicum
Genus of toxic flowering plants known for colchicine and autumn blooms.
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Native to West Asia, Europe, parts of the Mediterranean coast, and extending down the East African coast to South Africa and the Western Cape, the genus Colchicum comprises around 160 species of perennial flowering plants that grow from bulb-like corms. It belongs to the botanical family Colchicaceae. A distinctive botanical feature is that the flower’s ovary develops underground, necessitating extremely long styles—often exceeding the length of the rest of the flower—to reach pollinators above ground. All species in the genus are toxic.
Common names
The common names autumn crocus, meadow saffron, and naked lady refer to the ‘naked’ crocus-like flowers that appear in late summer or autumn, long before the strap-like foliage emerges in spring. Although Colchicum and Crocus can be confused by casual observers—especially since some crocus species also bloom in autumn—they are easily distinguished by floral anatomy: colchicums have three styles and six stamens, while crocuses have a single style supporting three long stigmas and three stamens. The corms also differ: colchicum corms are irregular in shape, whereas crocus corms are flattened and ball-like. Crocuses belong to the iris family, Iridaceae.
Etymology
The genus name derives from Κολχίς (Colchis), the Ancient Greek name for the region of Kolkhida in modern Georgia (Caucasus). In Greek mythology, Colchis was the destination of the Argonauts in their quest for the Golden Fleece, where Jason encountered Medea. Scholars trace the toponym to the Urartian Qulḫa, pronounced “Kolcha.”
Cultivation
Temperate colchicums are commonly grown as garden ornamentals. Cultivated species include C. × agrippinum, C. autumnale, C. × byzantinum, C. cilicicum, C. lusitanum, C. speciosum, and C. tenorei, along with numerous cultivars such as ‘Dick Trotter,’ ‘Disraeli,’ ‘Giant,’ ‘Harlekijn,’ ‘Lilac Wonder,’ ‘Pink Goblet,’ ‘Poseidon,’ ‘Rosy Dawn,’ ‘Violet Queen,’ and ‘Waterlily.’ Several of these have received the Royal Horticultural Society’s Award of Garden Merit. In the United Kingdom, the National Collection of colchicums is maintained at Felbrigg Hall, Norfolk.
Medicinal uses and poisonous properties
Plants in this genus contain toxic amounts of the alkaloid colchicine, which is used pharmaceutically to treat gout and familial Mediterranean fever. The leaves, corm, and seeds are poisonous. The species C. autumnale contains the most lethal concentration of colchicine.
Scientific classification
- CladeTracheophytes
- CladeAngiosperms
- CladeMonocots
- OrderLiliales
- FamilyColchicaceae
- GenusColchicum
Named by L.
Sources: Wikipedia taxobox: Colchicum (CC BY-SA 4.0)
Quick Facts
- Native range
- West Asia, Europe, Mediterranean coast
Facts from the source article.
Lore & Background
The name Colchicum derives from Κολχίς (Colchis), the Ancient Greek name for the region of Kolkhida in modern Georgia, which features in Greek mythology as the land of the Golden Fleece and where Jason encountered Medea. The Greek toponym is thought by scholars to derive from the Urartian Qulḫa, pronounced 'Kolcha'.
In the genus, the ovary of the flower is underground, resulting in extremely long styles, often more than 10 cm. All species are toxic, containing the alkaloid colchicine. While many species are highly toxic—including C. autumnale—no definitive ranking of 'most lethal' among all species is established in reliable botanical sources.
Taxonomy & the Saffron Confusion
Colchicum autumnale occupies a confusing position in the world of autumn-blooming flowers. Though it shares a visual kinship with the true crocuses—those delicate blooms associated with spring and, in the case of Crocus sativus, with the precious spice saffron—it belongs to an entirely different botanical family. Where genuine crocuses sit within Iridaceae, this plant is a member of Colchicaceae, a distinction that carries real consequences for both identification and safety.
The common names only deepen the confusion: "meadow saffron" suggests a culinary connection that simply does not exist, while "autumn crocus" is a label also applied to the genuine saffron plant itself. Despite these taxonomic mix-ups, the species has earned a place in horticulture. It is grown as an ornamental across temperate regions, and the cultivar 'Nancy Lindsay' has been recognised with the Royal Horticultural Society's Award of Garden Merit—a testament to its visual appeal even as its toxicity remains a constant caveat for gardeners.
Reader's Guide
Colchicum holds significance both as a source of the pharmaceutical alkaloid colchicine, used to treat gout and familial Mediterranean fever, and as a poisonous plant historically implicated in murders, such as those by Catherine Wilson in the 19th century. Its leaves, corm, and seeds are poisonous. In cultivation, temperate colchicums are commonly grown as ornamental flowers, with many cultivars and hybrids; in the United Kingdom, the National Collection is maintained at Felbrigg Hall, Norfolk.
The genus is often confused with Crocus, but colchicums have 3 styles and 6 stamens, while crocuses have 1 style with 3 stigmas and 3 stamens; the corm structures also differ. Molecular genetic evidence has moved many species previously classified in Androcymbium, Bulbocodium, and Merendera into Colchicum, though Androcymbium is still considered a separate genus by some. The species Colchicum melanthioides, also known as Androcymbium melanthioides, is notable for producing flowers and leaves simultaneously, with white flowers enclosed by white bracts; close relatives may be pollinated by rodents.
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Sources
Compiled from Wikipedia and the sources listed below. Text from Wikipedia is available under CC BY-SA 4.0; this entry is adapted from it.
- Wikipedia: Colchicum (CC BY-SA 4.0).
- Word definitions: the Codexery glossary, each quoted from its Wikipedia article.
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