An utricle is like an achene, but it has a compound ovary, sometimes with several seeds.
From the en.wikipedia.org
Reconfiguration of the achene and receptacle metabolic networks during strawberry fruit development.
From the nature.com
Charles Heiser, a world authority on sunflowers, identified the achene as belonging to the domesticated sunflower.
From the newscientist.com
The grapefruit-sized, ovoid fruit has a rough surface, and each fruit is divided into many achenes, each achene surrounded by a fleshy perianth and growing on a fleshy receptacle.
From the en.wikipedia.org
More examples
Small dry indehiscent fruit with the seed distinct from the fruit wall
An achene (also sometimes referred to as "akene" and occasionally "achenium" or "achenocarp") is a type of simple dry fruit produced by many species of flowering plants. Achenes are monocarpellate (formed from one carpel) and (they do not open at maturity). ...
A dry, indehiscent, one-seeded fruit, with seed attached to pericarp at a single point.
A fruit which is small, dry, hard, 1-celled and 1-seeded.
A dry indehiscent 1-seeded fruit, from an either superior or inferior ovary of 1 carpel, with the seed not fused to the fruit wall; e.g. as in Ranunculaceae (from a superior ovary) and Asteraceae (from an inferior ovary and usually topped by the pappus and sometimes called a cypsela). Fig. ...
A dry, one seeded, indehiscent fruit. Example 1 - Those little hard things stuck to strawberries. Example 2 - A sunflower seed. Yes, you are eating achenes.
A simple, one-seeded fruit in which the seed is attached to the ovary wall at only one point, such as the "seed" on the surface of a strawberry.
A dry one-seeded fruit which does not split. Common in sunflower family and many other flowering plants.
A small, dry, hard, one celled, one seeded, non-spliting fruit.