Clover
Clover
Quattrius infectum, this is not the real scientific name given by humans.
The Clover, as you probably know, occurs as a low, green cluster of plants, each usually having a cluster of three leaves, and on rare occasions known to produce four or, exceptionally, even more. There are also rotting or dying forms seen of this plant in Pikmin 2, where it can be found similarly to in reality. This, as a plant, is not at all useful to the Pikmin Captains. Don't confuse this with the Science Project, a treasure that is actually a four-leaved clover!
Olimar's Notes
This is a naturized species. These plants are extremely persistent, and with the assistance of a symbiotic fungus that grows on it's roots, the species is able to survive even in drought conditions. Typically, its leaves come in groupings of three, but intense impacton the leafing stem early in the development cycle can result in an extremely rare four-leaf cluster.