Dipsacus is a genus of flowering plant in the family Dipsacaceae. The members of this genus are known as teasel or teazel or teazle. The genus includes about 15 species of tall herbaceous biennial plants (rarely short-lived perennial plants) growing to 1–2.5 metres (3.3–8.2 ft) tall. Dipsacus are native to Europe, Asia and northern Africa. The genus name is derived from the word for thirst and refers to the cup-like formation made where sessile leaves merge at the stem. The seeds are an important winter food resource for some birds, notably the European Goldfinch. Teasels are often grown in gardens and encouraged on some nature reserves to attract them.
A new iridoid glucoside, loganic acid-6'o-β-δ-glucoside, has been isolated from the defatted root of Dipsacusasperoides. Its structure has been elucidated by spectroscopic means as 1s-(1α,4aα,6α,7α,7aα)-1-{(6-o-β-δ-glucopyranosyl-β-δ-glucopyranosyl)oxy}-1,4a,5,6,7,7a-hexahydro-6-hydroxy-7-methyl-cyclopenta{c}pyran-4-carboxylic acid.