• Double O Arch


    National Park Utah

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Uinta Groundsel (Lobeleaf Groundsel; Basin-butterweed)

Senecio multilobatus

Senecio multilobatus

Family: Asteraceae (A Utah Flora – Compositae) – Sunflower Family

Perennial, biennial or winter annual herbs from a taproot; stems 3.9” to 2.6' (1 to 8 dm) tall; the juice watery

Leaves: alternate and basal; simple (pinnatifid); basal leaves 0.08” to 4.8” (2 to 12 cm) long, 0.12” to 1.4” (0.3 to 3.5 cm) wide; leaves reduced going upwards along stem

Flowers: 7 to 13 yellow ray flowers 0.16” to 0.4” (4 to 10 mm) long or lacking; yellow disk flowers, disk 0.24” to 0.6” (6 to 15 mm) wide; involucres 1.6” to 3.6” (4 to 9 cm) high, 0.16” to 0.4” (4 to 10 mm) wide; flower head appears to be a single flower, but is composed of several flowers (a composite)

Pollinators: other Senecio species are pollinated by insects

Fruits: achene – 1 seeded with hard shell

Blooms in Arches National Park: April, May, June, July, August, September, October

Habitat in Arches National Park: desert shrub and pinyon-juniper communities

Location seen: park road mile 0 to 2.5, Salt Valley

Other: The genus name, "Senecio”, is from the Latin “senex” which means “old man” referring to the fine white hairs on the seeds that resemble an old man's beard. The species name, “multilobatus”, means “many-lobed” which describes the leaves.

This family is the most advanced and complex of the dicots. The family is rich in oils and resins and is found in every part of the world, but is infrequent in the tropical rainforest. Aquatic or semi-aquatic species are also uncommon.

Did You Know?

Pine Tree Arch

There are over 2,000 cataloged arches in Arches National Park. In order to be considered an arch, an opening must measure at least three feet (in any direction).