Verbena(redirected from Black-blue)
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a genus of plants in the family Verbenaceae.
called also purple top; suspected of causing sickness and abortion in cattle.
contains a glycoside verbenalin reputed to cause contraction of the uterus and photosensitization. Called also common vervain.
thought to cause photosensitization. Called also Verbena venosa, wild verbena.
suspected of causing deaths in chickens and photosensitization in sheep. Called also Mayne's pest.