Basic Information

Common Name: Descurainia

Scientific Name: Descurainia

Native Habitat: North America, particularly arid and semi-arid regions.

History / Discovery / Cultivator

Descurainia, commonly known as tansymustard, is a genus of flowering plants in the mustard family (Brassicaceae). The plants are native to North America, with a particular prevalence in the arid and semi-arid regions of the western United States and Canada. The name “Descurainia” honors French botanist François Descuraine (1658-1749), a figure of significant, although perhaps less widely known, standing within early botanical studies. He was a pioneer of botanical garden design and plant cultivation.

The history of Descurainia is interwoven with the broader narrative of botanical exploration and plant classification during the 18th and 19th centuries. As European naturalists ventured into North America, they encountered and documented numerous previously unknown plant species, including those belonging to the Descurainia genus. These early botanical expeditions focused on cataloging the biodiversity of the new world and understanding the relationships between different plant species. The plants, generally considered weedy, were initially catalogued alongside other flora in these regions.

The genus Descurainia was formally established by Philip Miller, a Scottish botanist who served as the chief gardener at the Chelsea Physic Garden in London during the mid-18th century. Miller’s work contributed significantly to the standardization of plant names and the development of a coherent system of botanical nomenclature. His Gardener’s Dictionary, published in several editions between 1731 and 1768, became a widely consulted reference work for horticulturalists and botanists.

While Descurainia plants have not been extensively cultivated for ornamental purposes or commercial uses, they have played a traditional role in the medicinal and food practices of indigenous peoples of North America. Various species of Descurainia have been used by Native American tribes for a range of purposes, including as a food source, particularly the seeds, and as a treatment for various ailments. Some tribes used the seeds to make a type of flour or added them to soups and stews. The leaves and stems have also been used medicinally, for example, as a poultice to treat wounds or skin irritations. These traditional uses reflect an intimate knowledge of the plant’s properties and its potential applications within the local ecosystem.

Today, Descurainia plants continue to be studied by botanists and ecologists interested in understanding the diversity and adaptation of plant life in arid environments. Their tolerance to drought and harsh conditions makes them a valuable subject for research on plant physiology and evolutionary biology. While they may not be widely cultivated in gardens or commercial settings, Descurainia plants remain an important component of the natural landscape of North America, with a rich history intertwined with botanical exploration and indigenous knowledge. The genus serves as a reminder of the ongoing importance of understanding and preserving the natural world.

Plant Care Summary

Botanical Insights

Adaptations

Descurainia species exhibit several key adaptations that enable them to thrive in arid and semi-arid environments. Their drought tolerance is a primary adaptation, allowing them to survive extended periods with limited water availability. This is achieved through several mechanisms, including deep root systems that can access water deep within the soil, and the ability to store water in their tissues. Furthermore, some species have developed adaptations to reduce water loss, such as small leaves or a waxy coating on their leaves and stems. The ability to quickly germinate and grow after rainfall events is another critical adaptation, allowing them to take advantage of brief periods of favorable conditions.

Propagation Methods

Descurainia species can be propagated by seed. Collect seeds from mature plants in late summer or fall. Direct sowing in the garden in the fall or early spring is generally successful. Ensure the soil is well-draining and the seeds are lightly covered. Seedlings should emerge within a few weeks, depending on temperature and moisture conditions. Propagation by cuttings is not generally practiced for this genus.

Toxicology

Descurainia species are generally considered non-toxic to humans and pets. However, ingestion of large quantities may cause mild gastrointestinal upset. It’s always advisable to prevent pets and children from consuming any wild plant, even if it is generally regarded as non-toxic. If ingestion occurs and symptoms develop, consult a medical professional or veterinarian.

Common Problems

Pests:

• Aphids
• Flea Beetles
• Cabbage White Butterfly Larvae

Diseases:

• Root Rot (in poorly drained soils)
• Fungal Leaf Spot

Other:

• Stunted growth: Poor soil conditions or lack of sunlight.
• Yellowing leaves: Overwatering or nutrient deficiency.
• Premature bolting: Hot weather or stress.

Rarity & Value

Rarity:

Descurainia plants are not generally considered rare. They are relatively widespread in their native range, particularly in western North America. However, specific species or populations may be less common in certain areas due to habitat loss or other environmental factors.

Value:

Descurainia plants have limited commercial value. They are not typically cultivated for ornamental purposes, and their use as a food source is largely confined to traditional practices. The primary value of Descurainia lies in their ecological role as a component of arid and semi-arid ecosystems.