How does Wei with cursive prefix form words?

Qian Liu

[Definition] Plant name. Deciduous shrub with slender trailing stems and dense thorns on branches, pinnately compound leaves, obovate or rectangular leaflets and fragrant white or red flowers. Flowers are visible, and fruits can be used as medicine. Also refers to the flowers of this plant.

[Example] Bring roses into the night and turn on the peacock's happy lights.