Baptisia australis is a clump-forming perennial in the Fabaceae that produces blue flowers from May to July. It carries deciduous foliage and is happiest in full sun on well-drained soils. The plant is fully hardy in the UK and establishes as a long-lived clump over seasons.

Blue wild indigo (Baptisia australis) produces blue flowers from May to July and forms a deciduous clump in full sun.

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

Baptisia is a genus in the legume family, Fabaceae. They are flowering herbaceous perennial plants with pea-like flowers, followed by pods, which are sometimes inflated.

Baptisia australis

Baptisia australis var. minor is a perennial herb in the pea family (Fabaceae) valued for its blue flowering spikes that appear in the UK from May to July. In the wild it grows at woodland edges, beside streams and in open meadows. It spreads both by seed and by creeping rhizomes. Parasitic weevils frequently infest the seed pods, so seed-set can be low.

Blue Wild Indigo (Baptisia australis var. minor) is a perennial Fabaceae member flowering in the UK from May to July.

Baptisia australis var. minor

Blue Wild Indigo | Baptisia australis var. minor

Baptisia leucantha is a species in the genus Baptisia (family Q44448) that flowers from May to July. It offers a seasonal display across late spring and early summer. Plants in this genus are grown for their upright flowering stems and terminal racemes. Allow space for individual specimens to establish without frequent disturbance.

Baptisia leucantha flowers from May to July and suits a sunny, well-drained spot in the garden.

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

Baptisia leucantha

Baptisia leucophaea is a species in the genus Baptisia. It flowers in the UK from May to July. Gardeners should check nursery details for height, spread and specific site requirements before planting to allow sufficient space.

Baptisia leucophaea blooms in the UK from May to July and should be sited with its mature spread and supplier notes in mind.

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

Baptisia leucophaea

Baptisia perfoliata is a perennial that bears yellow flowers from May to July. Native to Alabama, Florida, Georgia and South Carolina, it suits well-drained sites and tolerates dry to medium soil moisture. Give it full sun or partial shade and avoid positions that remain waterlogged.

Catbells (Baptisia perfoliata) is a perennial with yellow flowers from May to July that prefers well-drained, sunny or part-shade sites.

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

Baptisia perfoliata

Catbells | Baptisia perfoliata

Baptisia tinctoria is a perennial herb that produces yellow flower spikes from May to July. It grows to about 0.9 m and prefers full sun in sandy or loamy, well-drained soils. Native to eastern North America, it is fully hardy in the UK (H7). Suited to wildlife gardens, naturalising and borders.

Wild indigo (Baptisia tinctoria) is a fully hardy perennial reaching about 0.9 m with yellow flowers from May to July.