hyoscyamus

noun

hyo·​scy·​a·​mus -məs 

1

capitalized : a genus of poisonous Eurasian herbs of the family Solanaceae that have a capsular fruit and include the henbane (H. niger)

2

: the dried leaves of the henbane containing the alkaloids hyoscyamine and scopolamine and used as an antispasmodic and sedative