Caucasian Leopard's Bane (D. orientale or D. caucasicum) is the most common species in gardens and hardy in Zones 5 to 8. Varieties include:
‘Finesse’ grows 2 feet tall, is late blooming, bears 3-inch-wide, yellow-orange, semi-double flowers, and comes true from seed.
'Gerhard' bears lemon-yellow flowers with greenish yellow centers.
‘Magnificum’ bears 3-inch-wide, yellow flowers on 2- to 2.5-foot tall plants.
'Miss Mason' (a hybrid beteween D. orientale and D. austriacum) grows 1 to 2 feet tall, bears canary yellow flowers and is less likely to go dormant in summer.
‘Spring Beauty’ ('Frulingspracht') bears double yellow flowers on 1.5-foot-tall plants.
Great Leopard's Bane (D. pardalianches or D. cordatum) grows to 3 to 4 feet tall and his hardy in Zones 5 to 8. 'Goldstrauss' is a variety.
Plantain Leopard's Bane (D. plantagineum) grows up to 3.5 feet tall and his hardy in Zones 4 to 8. Varieties include 'Excelsum', 'Harpur Crewe' and 'Strahlengold', which persists and flowers into summer and resists mildew and root rot.