Colchicum speciosum

Among communities across South and Southeast Asia, Alstonia scholaris (L.) R.Br. is prepared as a mild tea from leaves or young bark to relieve fevers and colds (according to Rüedi, 2003), and as a stronger bark decoction to treat coughs, bronchitis, and throat pain (according to Kirtikar and Basu, 1935; Bhattacharjee, 2004). In tropical coastal India and Sri Lanka, leaf infusions are used for gut pain and dysentery (according to Bhattacharjee, 2004), while in Thailand the leaves are made into a poultice or mild tea for wound care and inflammation (according to Cheeptham et al., 2003). Throughout Southeast Asia and parts of India, the bark and leaf are also macerated in oil for massage or applied as a poultice for muscle and joint pain (according to Cheeptham et al., 2003; Rüedi, 2003). Importantly, these uses are associated with aqueous or macerated preparations rather than the stronger, latex‑rich milky latex preparations used topically for ulcers and severe wounds.

Practical preparation—throat‑soothing bark infusion: simmer 1 gram of dried bark in 250 ml water for 15 minutes, cool to warm, strain, and drink 2 to 3 cups daily. Do not use the milky latex preparation; it can cause severe skin irritation (according to Rüedi, 2003). Because official data on dose limits and contraindications for specific extracts of A. scholaris are not standardized, the safest advice is to use only under the guidance of a qualified practitioner, especially in pregnancy and while breastfeeding (according to Bhattacharjee, 2004).

Well‑documented constituents for Alstonia scholaris include indole alkaloids such as echitamine, alstonine, and reserpinine, as well as triterpenoids and iridoid glycosides, compounds that are consistent with the plant’s traditional use in fevers, coughs, and inflammation (according to Rüedi, 2003; Cheeptham et al., 2003; Bhattacharjee, 2004). Modern relevance: commercial leaf and bark extracts are still produced for cough and cold blends in parts of South Asia, and ongoing phytochemical work continues to map alkaloid profiles across regions, while traditional uses remain part of household practice where access to modern medicine is limited.

Common products:
The corms (bulbous underground stems) of Colchicum speciosum contain colchicine, a tropolone alkaloid that is extracted and supplied as a laboratory reagent. Commercial forms include purified colchicine (typically ≥95 % purity) packaged as a dry powder or in ethanol solution, and crude extracts standardized for colchicine content (often expressed as mg of colchicine per gram of extract). These products are marketed to research laboratories for polyploidy induction and other cytogenetic applications.

Scientific/model‑organism use:
Colchicine extracted from C. speciosum is widely employed as a mitotic inhibitor in plant cytogenetics, cell‑biology protocols, and polyploid breeding programs. Standard procedures for inducing polyploidy in wheat, barley, and other crops specify colchicine concentrations and treatment durations derived from corm extracts. The species is referenced in major botanical and chemical databases (e.g., GBIF, PLANTS, PubChem) as a source of colchicine for assay development and reference material, supporting genetics and molecular‑biology research.

Properties relevant to use:
Colchicine is a lipophilic alkaloid (C₂₂H₂₅NO₆) that binds tubulin, preventing microtubule polymerization. It is highly soluble in ethanol and sparingly soluble in water, which facilitates efficient extraction from corm tissue using ethanol‑based protocols. The compound remains stable under cool, dry storage conditions, allowing long‑term reagent stability suitable for laboratory use.

Standards and regulation:
Colchicine derived from Colchicum species is classified as a hazardous chemical under UN GHS (Category 2). Laboratories handling the reagent must comply with occupational‑safety regulations such as OSHA’s Hazard Communication Standard and EU REACH for chemical registration and risk assessment. Quality‑management systems for chemical reagents (e.g., ISO/IEC 17025) are commonly applied to ensure reliable analytical performance.

Sustainability and sourcing:
Wild populations of C. speciosum, native to the Caucasus and parts of Iran, have historically been harvested for colchicine extraction, raising conservation concerns. To mitigate pressure on natural stands, many research institutions and commercial suppliers now cultivate the species under controlled greenhouse or field conditions. Cultivation programs enable traceability, promote sustainable sourcing, and support consistent supply of colchicine‑rich corms for laboratory reagents.

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