threadleaf groundsel
Noun: A specific perennial plant (Senecio flaccidus var. douglasii, formerly Senecio longilobus) characterized by its bluish-green, thread-like leaves covered in dense, white, woolly hairs. It produces clusters of yellow, daisy-like flower heads and is native to arid regions of the southwestern United States. It is known to be toxic to grazing livestock.
This term is used specifically in botany, ecology, agriculture, and discussions about rangeland management to identify this particular toxic plant species. - The rancher identified threadleaf groundsel invading the pasture. - Botanists study the alkaloids in threadleaf groundsel that cause liver damage in cattle.
- As a subject of ecological study: The plant's adaptation to arid environments and its role in the ecosystem are topics of research.
- The spread of threadleaf groundsel is monitored as an indicator of overgrazed land.
- In toxicology: Refers to the plant as a source of pyrrolizidine alkaloids.
- The primary concern with threadleaf groundsel is its chronic toxicity to horses.
- Threadleaf Groundsel: The standard common name.
- Douglas' Groundsel: An alternative common name.
- Senecio flaccidus: The current accepted botanical genus and species name.
- Senecio longilobus: A former botanical name still commonly used.
- Woolly Groundsel: A related common name highlighting the plant's hairy appearance.
- Douglas' Ragwort: Another regional common name.
- Threadleaf Ragwort: A synonym using "ragwort," a related group of plants.
This term refers exclusively to this specific botanical species. It is a compound noun where "threadleaf" describes the slender, thread-like leaves and "groundsel" is the common name for plants in the Senecio genus. It does not have idiomatic or phrasal verb uses, as it is a highly specific scientific/common name.
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bluish-green bushy leafy plant covered with close white wool and bearing branched clusters of yellow flower heads; southwestern United States; toxic to range livestock
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