Biennial weed grows from a taproot, leaves are heart-shapes and hairy. Burs have velcro-like hairs on them.
Only during drought conditions, unpalatable.
Burrs (not toxic but dangerous).
Slobbering, frothing, drooling. Irritation on skin, eye, mouth, nose, ear or stomach.
Generally grazers will stay well away from the burrs, however if ingested they can do physical damage to the upper gastrointestinal tract.
*It should be noted that we are not veterinarians. This information is written specifically for horses and should be used for reference purposes only. If you think your horse has eaten something toxic call your vet right away.