The flower atop a mature Pikmin is called Chaenostoma cordatum, or commonly known as the Bacopa, Ornametal Bacopa, Sutera cordata or the Pikmin Flower. This was used to model the white, five petaled, yellow centered flowers that rest on top of the first generation of Pikmin species (the colors introduced in the first game), as well as the Bulbmin in Pikmin 2.
Chaenostoma cordatum also come in different colors: white, lavender, and magenta/violet. So far, in the Pikmin species, all three of these colors have been used, each symbolizing a generation of Pikmin, or a new game in the series. The magenta color has been used on all new Pikmin colors (not counting Bulbmin) in Pikmin 2, or the second generation of Pikmin species. The lavender color has been used to top all the known new species in Pikmin 3, or the third generation of Pikmin.
In real life
This is a cultivated species of flower bred with the intention of using it to market the first game. Nintendo announced the impending creation of the flower through an agreement with S&G Flowers USA in late 2001, and it became commercially available in April the following year, five months after the release of the game. The full press release can be found here.
The Chaenostoma cordatum are a perennial type of plant (reoccurring every year). They are also an Evergreen, which means that even in the harsh winter climate and lack of sun, the plant's leaves can retain its green color. In addition, the flowers can live through the same weather without dying. This real life logic can be placed into the Pikmin world. The Red Pikmin are shown in Pikmin 2 in a harsh snowy landscape with the Pikmin’s leaf green and bright. The record for the lowest temperature a Chaenostoma cordatum has endured is 30 degrees Fahrenheit (-1.1 degrees Celsius). Chaenostoma cordatum are remarkably strong plants, as a result. Mr. Miyamoto must have had this in mind for the Pikmin to be strong and durable creatures.
The different variants of the Chaenostoma cordatum are the Snowflake white and the Snowstorm Blue/Magenta.
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