A plant that steals
In the loose sand dunes of the Sonoran Desert, a strange, mushroom-like head emerges from the ground. This is the visible part of Lennoa madreporoides, a parasitic plant entirely lacking chlorophyll. Unable to perform photosynthesis, it survives by theft. This plant, known as sand food, is a holoparasite, meaning it derives all of its nutrients and energy by attaching to the roots of host plants. Its underground stem connects to the roots of shrubs like wild buckwheats and ragweeds, taking the products of their hard work.
The plant's scientific name shows its strange appearance. Madreporoides means "resembling Madrepore coral," a comparison to its dense, cauliflower-like flower head. This head, typically 5 to 15 centimeters tall, is covered in small, star-shaped flowers that are lavender or violet with yellow centers. Below the surface, the fleshy, scaly stem can grow up to two meters long as it snakes through the sand searching for a host. Despite its parasitic nature, the plant belongs to the Boraginaceae family, the same family that contains common garden plants like borage and forget-me-nots.
An underground harvest
For the Seri (Comcaac) people of Sonora, this parasitic plant was a valuable food source in an unforgiving environment. They knew how to locate the plant by spotting subtle cracks in the sand made by the emerging flower head. The starchy, succulent stems were harvested by digging deep into the dunes.
The stems were eaten raw, boiled, or roasted in the ashes of a fire. Their taste is described as being similar to a potato or jicama—starchy and sweet. This provided a reliable source of carbohydrates stolen directly from the root systems of other desert flora. This was an important food item for several Indigenous groups in the desert region. The plant's life cycle and seed dispersal are still being studied, but its role in the human ecology of the Sonoran Desert is well-documented. Its habitat is under threat from agricultural expansion and damage from off-road vehicles, making this unusual plant increasingly rare.