Verbena 'Purple Haze' is a cultivated form of the genus Verbena (family Verbenaceae) selected for its floral display. As with other verbenas, it bears small, five-petalled flowers carried in dense spikes and is seen in cultivars in colours including purple. In the UK it flowers from June to October, providing an extended season of bloom. Leaves are generally opposite and simple, a typical trait of the genus.

Verbena 'Purple Haze' is a Verbena cultivar that flowers in the UK from June to October with dense, often purple, flower spikes.

Verbena, also known as vervain or verveine, is a genus in the family Verbenaceae. It contains about 150 species of annual and perennial herbaceous or semi-woody flowering plants.

Verbena 'Purple Haze'

Verbena bonariensis 'Lollipop' is a tall, slender-stemmed perennial in the Verbenaceae that bears tight clusters of lavender to rose-purple flowers. It is cultivated either as a flowering annual or as an herbaceous perennial. Flowering runs from June to October. The habit produces long, terminal stems that give height and a light silhouette in planting schemes.

Purpletop Vervain (Verbena bonariensis 'Lollipop') bears lavender to rose-purple clusters from June to October and suits the rear of mixed borders.

Verbena bonariensis 'Lollipop'

Purpletop Vervain | Verbena bonariensis 'Lollipop'

Verbena corymbosa is a species in the genus Verbena, belonging to the family Verbenaceae, notable for its extended flowering season. In UK gardens it flowers from June to October. The plant suits situations where a prolonged run of blooms is wanted and can be combined with other summer-flowering subjects. Deadheading spent flowers will help maintain the display throughout the season.

Verbena corymbosa blooms from June to October and belongs to the Verbenaceae family.

Verbena corymbosa

Verbena hastata is a perennial herbaceous in the Verbenaceae that produces tall, narrow flowering spikes reaching about 1.5 m. The flowers are violet to deep purple, occasionally white, and appear in succession. It prefers a sunny position and soils that remain moist but are well drained. Fully hardy in the UK, it flowers from June to October.

American blue vervain (Verbena hastata) is a fully hardy 1.5 m perennial with violet to deep purple flower spikes from June to October.

https://en.wikipedia.org/wiki/Verbena_hastata

Verbena hastata

American blue vervain | Verbena hastata

Verbena rigida is a herbaceous perennial in the Verbenaceae, valued for its long season of scented flowers. It prefers a sunny site in well-drained soil and moderate moisture. Flowering runs from June to October, making it useful where extended summer colour is wanted. It suits mixed borders and containers on a sheltered, sunny edge.

Slender vervain (Verbena rigida) is a sun-loving herbaceous perennial with scented flowers from June to October suitable for borders and containers.