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Nelson's tansymustard
Scientific Name: Descurainia pinnata ssp. nelsonii
Family: Brassicaceae
Category: Dicot
Growth: Forb/herb
Duration: Annual, Biennial
Other Names:
Nelson's Tansymustard
Nelson's Tansymustard refers to several plants within the Descurainia genus. The most commonly referenced species appears to be Descurainia nelsonii. Other related taxa include:
- Descurainia pinnata var. nelsonii
- Descurainia pinnata ssp. nelsonii
It is also known by several common names, including:
- Western Tansymustard
- Menzies' Tansymustard
- Payson's Tansymustard
Taxonomy and Nomenclature
- Family: Brassicaceae (also known as Cruciferae)
- Kingdom: Plantae
Synonyms for Descurainia nelsonii include Descurainia nelsonii (Rydb.) Al-Shehbaz and Descurainia brachycarpa var. nelsonii.
Distribution and Habitat
Western Tansymustard (Descurainia pinnata), a close relative, is noted as being very widespread throughout North America.
Specific mentions in the provided text connect Nelson's Tansymustard to locations such as Idaho, Oregon and the Western United States.
Morphological Characteristics
- The plant has pinnate leaves that are highly lobed.
- It features tiny golden-yellow flowers at the end of its stems.
- Growth habit can be annual or biennial.
Ecological Role
- Tansy mustards can be problematic weeds in some areas.
Interactions with Other Organisms
- Older caterpillars feed on the flowers and fruits of tansy mustard.
- It serves as a larval food plant for some butterflies, such as the small white butterfly.
- Jackrabbits are reported to eat tansymustard.
Resources and Further Information
- Encyclopedia of Life
- Oregon Flora Project
- United States Department of Agriculture Plants Database