Greasewood (Sarcobatus vermiculatus
) is a perennial shrub that is native to North America. It produces multiple low, spreading branches that are brittle and spinescent; the ends of smaller branches taper to sharp thorns. Leaves are ½ to 2 inches long, bright green, strap-shaped and somewhat fleshy. It has greenish small and inconspicuous flowers and cone-shaped fruiting spikes about ½ inch long.
contains soluble sodium and potassium oxalates, which can be toxic to horses if consumed. Oxalate levels in S. vermiculatus
vary depending on season, stage of growth and environmental factors. If large quantities of S. vermiculatus
are ingested over a short period of time it can cause kidney damage due to high levels of oxalates. Signs develop within 4 to 6 hours after ingestion of the plant. S. vermiculatus
is also a contact dermatitis