No, and yes
Periwinkle (Cataranthus sp.) is a african/madagascarian genus and does not occur naturally in the Amazon. However, the commen Cataranthus roseus (highly toxic and highly medinal, check it out!) is a pan-tropic weed by now.
the
there are colourful flowers
Heliconia Rafflesia
One can pick periwinkle flowers anywhere they are grown and are allowed to pick them. Many gardeners grow periwinkle flowers and you can also find them in the wild.
the heliconia flower
By explosion
Yes.
The Amazon Rainforest is a Tropical Rainforest
Periwinkle is native to North America, Europe, China and India. It is a semi woody evergreen perennial, and is known by three names: Vinca, Periwinkle (or Madagascar periwinkle), and Myrtle.
In the Amazon rainforest, the canopy is thick and may stretch to heights of 80 to 150 feet. These have flowers and fruits and are a good habitat for birds, insects and small mammals. The understory of the Amazon rainforest is characterized by high humidity, low light and constant heat.
The Amazon Rainforest is a tropical rainforest.
there are names like daintree and the Amazon