• South Window

    Arches

    National Park Utah

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  • Delicate Arch Viewpoint Road Closed

    Due to flash flooding in Winter Camp Wash, the Delicate Arch Viewpoint Road is currently inaccessible.

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    Due to extremely dry conditions, fire restrictions are in effect in all national park units in Southeast Utah. More »

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?

Desert Bighorn Sheep

Once feared of becoming extinct, desert bighorn sheep are making a tentative comeback in southeast Utah due to reintroduction efforts by the National Park Service. There are roughly 50 sheep in Arches, though their shy nature keeps them well-hidden from most visitors. More...