Name: Red Thumb / Desert Thumb
Scientific name: Cynomorium songaricum Rupr.
Accepted taxonomic name by some sources: Cynomorium coccineum subsp. songaricum
Mongolian name: Ulaan goyo / Zuungariin goyo
Other English names: Red Thumb, Desert Thumb, Songaricum Cynomorium
Red Thumb is a rare desert plant found in dry sandy regions of southern Mongolia and north-western Inner Mongolia in China. It is a medicinal, parasitic plant that grows in harsh desert and semi-desert environments.
Red Thumb is not a normal green plant. It has no green leaves and does not make its own food through photosynthesis. It is a holoparasitic plant, meaning it depends completely on host plants for water and nutrients.
This plant usually attaches to the roots of desert shrubs. Important host plants include species of nitraria and other salt-tolerant shrubs that grow in dry sandy or saline desert areas.
Red Thumb spends much of its life underground. The visible part appears above the sand as a thick, fleshy, reddish-brown or dark red flowering spike. Because of its shape and colour, it looks like a red thumb or a short red club pushing up from the desert soil.
The plant has no normal leaves. Instead, it has scale-like parts on its thick stem. The flowering spike is covered with many very small flowers packed tightly together. After flowering, the spike may become darker.
Red Thumb is well adapted to desert life. Its underground parasitic growth helps it survive in places with very little rainfall, strong sunlight, dry wind, salty soil, and poor soil moisture. By depending on host shrubs, it can live where many other plants cannot grow easily.
This plant is part of the unique biodiversity of the Gobi Desert. It shows one of the special survival strategies of desert plants: living underground and taking water and nutrients from strong desert shrubs.
Red Thumb is also known as a traditional medicinal plant. It has been used in traditional Mongolian medicine and traditional Chinese medicine. Because of this, it is highly valued by local people.
However, wild Red Thumb populations can be damaged by overharvesting. The plant is usually collected by digging, and this can disturb the soil and damage the roots of host shrubs. If too many plants are collected, natural populations may decline.
Today, Red Thumb needs careful protection. Main threats include overharvesting, habitat disturbance, mining, road construction, desertification, climate change, and damage to host shrub communities. Protecting Red Thumb also means protecting the fragile desert ecosystem and the host plants it depends on.
Image gallery
