High Risk
Latin Name: Hyoscyamus niger
Henbane is a medium to tall plant with sticky and hairy stems. The leaves are oval to oblong and corsely toothed. The fowers, which appear May to September, are pale yellow with purple veins and trumpet shaped (20mm - 30mm long). The fruit which appears after the flowers take the form of green capsules. Henbane grows on bare and disturbed ground, especially near the sea, in farmyards, waysides and dumps.
Symptoms can include:
Restlessness, convulsions, rapid heartbeat, dilated pupils, dry mouth, constipation, paralysis, rapid respiration, raving madness, thirst.

The whole plant is extremely poisonous for horses however there have been no reported cases of poisoning in horses since the early twentieth century.