Theme, yellow: four o'clock flower

Solve puzzle

Mirabilis jalapa (the four o'clock flower or marvel of Peru) is the most commonly grown ornamental species of Mirabilis, and is available in a range of colours. Mirabilis in Latin means wonderful and Jalapa is a not uncommon placename in Central and North America. Mirabilis jalapa is said to have been exported from the Peruvian Andes in 1540.
-- Wikipedia