Melanthiaceae

Temperate perennials of woodland and wet meadow, growing from rhizomes or bulbs, with parallel-veined leaves and flower parts in threes. They were once folded into a very broad Liliaceae, and the split matters here more than most reshuffles do — because what unites the family is a class of steroidal alkaloids that the true lilies don’t make.

This is a family to know by species rather than by name, and its members sit at opposite ends of the safety range.

At one end, beth-root (Trillium erectum) and false unicorn (Chamaelirium luteum) are gentle rhizome medicines of North American practice, used as uterine and reproductive tonics. Both work through steroidal saponins rather than the family’s alkaloids, which is why they behave nothing like their relatives. Both are also slow-growing woodland plants under real collection pressure.

At the other end are two of the most dangerous plants in North American grassland. Death camas (Toxicoscordion venenosum) is pulled up in mistake for wild onion, and false hellebore (Veratrum viride) for ramps or gentian — the two commonest lethal foraging confusions on the continent. Both are documented here as poisoning references rather than medicines.

The family also produced one of the strangest chains in pharmacology. Lambs born to ewes grazing Veratrum californicum in Idaho were found with a single central eye, and the teratogen responsible — cyclopamine — turned out to block the Hedgehog signalling pathway that patterns the developing embryo. That pathway is reactivated in several cancers, and the observation led to vismodegib, an approved treatment for advanced basal cell carcinoma. A lethal plant deformity became a cancer drug target.

Two steroidal-alkaloid skeletons define the family, and they do different things.

The cevanine type — veratridine, cevadine, protoveratrine, zygacine — binds voltage-gated sodium channels and holds them open, causing persistent depolarisation. The result is bradycardia, collapsing blood pressure, vomiting and, at dose, respiratory failure. Veratrum was genuinely used as an antihypertensive into the twentieth century and abandoned because the gap between lowering blood pressure and stopping the heart was too narrow to dose.

The jervanine type — jervine and cyclopamine — is the teratogenic group, working through Hedgehog inhibition rather than on ion channels.

Trillium sits outside both, carrying steroidal saponins instead, which is the chemical reason the family’s two medicinal members are safe to use at all.