Heracleum sphondylium subsp. montanum (Schleich. ex Gaudin) Briq.

국표에 없다.

Many members of this genus, including this species[65], contain furanocoumarins. These have carcinogenic, mutagenic and phototoxic properties. The fresh foliage can cause dermatitis[21]. If the juice and hairs of the outer skin are left on the face and mouth, they can cause blisters[212]. This effect is especially prevalent for people with fair complexions[256].
Habitats	Rich damp soils of prairies and mountains, especially along streams and in open woods in Western N. America[212].

Heracleum sphondylium montanum is a PERENNIAL growing to 2.4 m (7ft 10in).
See above for USDA hardiness. It is hardy to UK zone 5 and is not frost tender. It is in flower in July, and the seeds ripen in August. The species is hermaphrodite (has both male and female organs) and is pollinated by Insects. The plant is self-fertile.
Suitable for: light (sandy), medium (loamy) and heavy (clay) soils. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils. It can grow in full shade (deep woodland) semi-shade (light woodland) or no shade. It prefers moist soil.

Heracleum sphondylium montanum Cow Parsnip PFAF Plant Database

Heracleum maximum - Common Cowparsnip, Cow Parsnip, Cow-parsnip - Southeastern Arizona Wildflowers and Plants (fireflyforest.com)

White Flowers - Rocky Mountain National Park (U.S. National Park Service) (nps.gov)