Colchicum autumnale, commonly known as autumn crocus, meadow saffron, or naked ladies, is a toxic autumn-blooming flowering plant that resembles the true crocuses, but is a member of the plant family Colchicaceae, unlike the true crocuses, which belong to the family Iridaceae. The name "naked ladies" is because the flowers emerge from the ground long before the leaves appear. Despite the vernacular name of "meadow saffron", this plant is not the source of saffron, which is obtained from the saffron crocus, Crocus sativus – and that plant, too, is sometimes called "autumn crocus".
This herbaceous perennial has leaves up to 25 cm (10 in) long. The flowers are solitary, 4–7 cm (2–3 in) across, with six tepals and six stamens with orange anthers and three white styles.: 324 At the time of fertilisation, the ovary is below ground.
C. autumnale is the only species of its family native to Great Britain and Ireland, with notable populations under the stewardship of the County Wildlife Trusts. It also occurs across mainland Europe from Portugal to Ukraine, and is reportedly naturalised in Sweden, European Russia, and New Zealand.
The bulb-like corms of C. autumnale contain colchicine, a useful drug with a narrow therapeutic index. Colchicine is approved in many countries for the treatment of gout and familial Mediterranean fever, but has a low therapeutic index. Colchicine is also used in plant breeding to produce polyploid strains.
Colchicum plants are deadly poisonous due to their colchicine content and have been mistaken by foragers for ramsons, which they vaguely resemble. The symptoms of colchicine poisoning are similar to those of arsenic, and no antidote is known.
This plant (and colchicine itself) poses a particular threat to felines. The leaves and fruit of meadow saffron contain the highest level of toxins,[clarification needed] but all parts of the plant are regarded as poisonous.
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