https://phys.org/news/2018-10-ways-survive-terrain.html

Most plant species produce a single type of fruit and seed that is adapted to the environment, but stone cress produces two sizes of fruit: a large fruit which opens by splitting, and a small fruit which remains closed until it has found a suitable habitat in which to germinate.

Not only are the fruits different, but inside there are two different types of seed: multiple slime- coated seeds in the large fruit, and a single non-coated seed in the small fruit.