The leaflets of this variety (grayi) are toothed above the midpoint, and there are typically nine. The flowers have five sepals and five petals.
Variety sitchensis is rare at the Park. The leaflets are toothed below the midpoint, and they tend to be more widely separated on the midrib of the leaf.
Grayi is the most common of the two varieties of Western Mountain-ash at the Park. It grows above 4,500 feet in thickets and open, moist habitats. A large group can be seen near the Sunrise parking lot, and is most noticeable when the fruits are ripe, as in the photo.
This variety (grayi) grows at Paradise as well as Sunrise. Here it is seen alongside the road to Paradise Valley.
This photo of variety sitchensis shows the toothed leaflets which tend to be more widely separated on the midrib of the leaf. This variety can be seen along the Silver Falls trail near Ohanapecosh.