Veratrum album is a perennial herbaceous plant in the Melanthiaceae that reaches about 1.5 m and produces white flowers in June to July. It is native to Europe, Africa and Asia. Plants prefer a full-sun position in moist but well-drained soils — sandy, loamy or clay. All parts are toxic if eaten, so wear gloves and protective equipment when handling and keep away from pets.

White false hellebore (Veratrum album) is a 1.5 m perennial that flowers in June to July and prefers full sun in moist, well-drained soils.

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

Veratrum is a genus of flowering plants in the family Melanthiaceae. It occurs in damp habitats across much of temperate and subarctic Europe, Asia, and North America.

Veratrum album

White false hellebore | Veratrum album

Veratrum californicum is a perennial herbaceous plant that sends up erect, leafy stems to about 2.5 metres and bears clusters of white flowers in early summer. It originates from western North America and favours consistently moist ground. The species is toxic if eaten, so handle with gloves and keep away from pets. Allow ample space: plants hold a strong vertical presence through the growing season.

California false hellebore (Veratrum californicum) is a tall, moisture-loving perennial with white flowers in June to July and is toxic if eaten.

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

Veratrum californicum

California false hellebore | Veratrum californicum

Veratrum grandiflorum is a perennial known as Large-flowered False Hellebore that produces large flower clusters in early summer. Native to East Asia, including China, it flowers in the UK from June to July. It prefers full sun to partial shade in moist, rich, well-drained soils with an acidic to neutral pH. All parts of the plant are highly toxic, so handle with caution.

Large-flowered False Hellebore (Veratrum grandiflorum) blooms June to July and suits moist, acidic to neutral soils in sun or partial shade.

Veratrum grandiflorum

Large-flowered False Hellebore | Veratrum grandiflorum

Veratrum stenophyllum is an herbaceous perennial in the Melanthiaceae that bears erect stems topped by panicles of white or brown flowers. It flowers in June to July. The species favours deep, wet soils and is typically found in damp, montane and waterside situations. Its underground black rhizomes contain potent poisons, so handle with care.

False Hellebore (Veratrum stenophyllum) is a moisture-loving perennial with panicles of white or brown flowers in June to July.

Veratrum stenophyllum

False Hellebore | Veratrum stenophyllum

Veratrum viride is a perennial herb notable for its toxicity and upright stature, reaching about 2.0 m. It flowers in June to July, bearing many small greenish blooms. The plant suits moist to wet soils and tolerates a range of soil types. Wear gloves and other protective equipment when handling as all parts are poisonous if eaten.

Green false helleborine (Veratrum viride) is a tall, toxic perennial that flowers in June to July and prefers moist, sunny soils.

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

Veratrum viride

Green false helleborine | Veratrum viride

Veratrum wilsonii is a perennial species in the Melanthiaceae, commonly called False Hellebore. Native to China, it produces its main flowers in June to July. All parts of the plant are toxic, so it must be handled with caution. It is a member of the genus Veratrum and is grown primarily by specialist collectors.

Veratrum wilsonii (False Hellebore) is a Chinese native that flowers in June to July and is toxic, so handle with care.

Veratrum wilsonii

False Hellebore | Veratrum wilsonii

Veratrum yunnanense is a vigorous herbaceous perennial in the Melanthiaceae from Yunnan, China, producing erect stems topped by panicles of white or brown flowers. It favours deep, wet soils and open positions in the landscape. The plant has strongly poisonous black rhizomes, so care is needed during planting and removal. Flowering occurs June to July.

False Hellebore (Veratrum yunnanense) from Yunnan bears white or brown flowers in June to July and prefers deep, wet soils.