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Threadleaf Groundsel, Senecio (Senecio longilobus)

Threadleaf Groundsel, Senecio (Senecio longilobus). Many-stemmed, evergreen composite. Toxic agent pyrrolizidine alkaloids. Cattle and horses are about equally sensitive to this plant. Sheep and goats are more resistant. Riddell Groundsel, Broom Groundsel (Senecio riddellii).

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Threadleaf Groundsel, Senecio (Senecio longilobus)

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  1. Threadleaf Groundsel, Senecio (Senecio longilobus) • Many-stemmed, evergreen composite. • Toxic agent pyrrolizidine alkaloids. Cattle and horses are about equally sensitive to this plant. Sheep and goats are more resistant.

  2. Riddell Groundsel, Broom Groundsel (Senecio riddellii) • Herbaceous, perennial of sunflower family. • Toxic agent pyrrolizidine alkaloids.

  3. Cocklebur • Coarse, rough, annual weeds. • Toxic agent is carboxyatractyloside, a glycoside causing hypoglycemia. Can poison all classes of livestock.

  4. Inkweed, Thickleaf Drymary (Drymaria pachyphylla) • Smooth, hairless, short-lived annual. • The toxic agent is unknown. Plant poisons cattle, sheep and goats.

  5. Tansy Mustard (Descurainia pinnata) • Annual forb growing to 2’. Single-stemmed, leafy throughout and covered with fine, gray hairs. • Toxic agent is unknown. Large quantities of the plant must be consumed before poisoning occurs. Tansy mustard also accumulates toxic levels of nitrate.

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