• Double O Arch

    Arches

    National Park Utah

Tomentose Amsonia (Woolly Amsonia)

Amsonia tomentosa

Amsonia tomentosa

Family: Apocynaceae – Dogbane Family

Perennial herbs; 7.9” to 2' (2 to 6 dm) tall

Leaves: alternate; simple; 0.04” to 0.48” (1 to 12 mm) wide

Flowers: 5 bluish-white tube-shaped partly united petals borne in terminal clusters; 5 parted sepals; 5 stamens; bisexual; corolla tube is 0.28” to 0.48” (7 to 12 mm) long

Pollinators: other genera in this family are pollinated by moths and butterflies

Fruits: pair of follicles

Blooms in Arches National Park: April, May

Habitat in Arches National Park: desert shrub communities

Location seen: Cache Valley in Arches National Park; outside Arches National Park on Corona Arch trail

Other: The genus name, “Amsonia”, honors Dr. Charles Amson, an 18th century American physician from Virginia. The species name, “tomentosa”, means “covered with fine, matted hairs” referring to the wool-like covering created by many small, matted, intermingled hairs.

Most plants in this family have milky sap and many are poisonous.

Did You Know?

proposed wilderness

Nearly 96% of Arches is recommended for wilderness designation. Though the recommendation has not been approved by Congress, the park is required to manage those 73,312 acres as though they were formally designated wilderness. More...