A scientist in a tropical jungle discovers a new plant species. It has flowers with three petals, and the bundles of vascular tissue are scattered throughout the stem. To what group of plants does the newly discovered species belong, and what type of plant is it

A plant that flowers with scattered vascular bundles throughout its stem would belong to a flowering plant group (angiosperms) and a monocotyledon type of plant.

Angiosperms generally consist of flowering. They are different from gymnosperms in their ability to produce flowers and produce seeds which are enclosed in fruits. Gymnosperms do not produce flowers, and their seeds are not enclosed in fruits.

Angiosperms are of two different types:

Monocots: these are gymnosperms with single seed leaf. In addition, they posses characteristics such as parallel veination in the leaves, trimerous flower parts and scattered vascular bundles in their stem's anatomy.
Dicots: these are gymnosperms with two seed leaves. They posses net-like veination in their leaves, tetramerous or pentamerous flower parts and ring-like arrangement of vascular bundles in their stems.

Hence, a plant with flowers and scattered vascular bundles in its stem would generally belong to the monocots group of angiosperms.