Chelone glabra 'Black Ace' is a bushy, deciduous perennial cultivar within the Chelone genus, known for its paired, undivided leaves and compact spikes of tubular, two-lipped flowers. This cultivar thrives in full sun or partial shade and is suited to a variety of soil types, including loam and clay, with moisture levels ranging from moist but well-drained to poorly drained. Hardy to UK zone H5, it is ideal for sheltered positions in cottage and informal gardens or flower borders. It flowers from late summer to early autumn, adding seasonal interest during spring and summer.

Chelone glabra 'Black Ace' is a hardy H5 perennial with compact tubular flowers, ideal for cottage gardens and flower borders in spring and summer.

Chelone glabra 'Black Ace'

Chelone lyonii, the pink turtlehead or Lyon's shell flower, is a species of flowering plant in the family Plantaginaceae. It is native to wet areas of the southern Appalachian Mountains of the United States. A deer-tolerant perennial, it is hardy in USDA zones 3 through 8, and is recommended for shady and wet situations, although it can handle full sun. The unimproved species and a number of cultivars are commercially available, including 'Hot Lips' and 'Pink Temptation'. In the garden it prefers full sun and partial shade and loam and clay soil. In UK gardens it is hardy in most of the UK (RHS H5). Suggested uses include cottage and informal garden and flower borders and beds. It tolerates soil of any pH, moist but well-drained, poorly-drained conditions and south-facing, west-facing, north-facing and east-facing aspects. Plant in well-drained soil in a suitable position. Water during establishment.

Lyon's shell flower (Chelone lyonii), also known as pink turtlehead, belongs to the Plantaginaceae family. This herbaceous perennial features distinctive, paired leaves and compact spikes of tubular flowers that bloom from late summer into early autumn.

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

Chelone lyonii

Chelone obliqua 'Alba' is a perennial in the Plantaginaceae with a rounded, multi-stemmed habit and deciduous foliage. It bears two-lipped, tubular flowers that form a characteristic 'turtlehead' shape and flowers in the UK from August to September. The plant prefers moist soils and a sheltered position in full sun or partial shade and is rated H5 (hardy).

Red Turtlehead (Chelone obliqua 'Alba') is a deciduous perennial that flowers from August to September and suits moist, sheltered border positions.