Nakedstem Bahia (Basin Daisy)
Synonym: Bahia nudicaulis
Family: Asteraceae (A Utah Flora - Compositae) – Sunflower Family
Perennial aromatic herbs; 4.8” to 1.8' (12 to 55 cm) tall; there are at least 2 varieties of this species at Arches National Park: Platyschkuhria integrifolia var. desertorum (Desert Bahia) and Platyschkuhria integrifolia var. oblongifolia (San Juan Bahia).
Leaves: alternate; simple; 0.6” to 3.8” (1.5 to 9.5 cm) long, 0.2” to 1.6” (0.5 to 4 cm) wide
Flowers: 7 to 11 yellow ray flowers and yellow disk flowers; flower head appears to be a single flower, but is composed of several flowers (a composite). Rays 0.24” to 0.56” (6 to 14 mm) long; numerous disk flowers, perfect, 0.4” to 0.8” (1 to 2 cm) wide
Pollinators: other genera in this family are pollinated by insects
Fruits: achene – 1 seeded with hard shell
Blooms in Arches National Park: April, May, June
Habitat in Arches National Park: desert shrub and pinyon-juniper communities; mainly in saline substrates and in the Morrison Formation
Location seen: Delicate Arch road, Delicate Arch trail, outside Arches National Park in Long Canyon (below Dead Horse Point State Park)
Other: The genus name, “Platyschkuhria”, is derived from “platy” which is a prefix meaning “flat, broad or wide” and “Schkuhria” which honors German botanist Christian Schkur (1741-1811). The species name, "integrifolia", means “entire leaves, not toothed”. The genus name, “Bahia”, honors J. F. Bahi, a Barcelona botany professor. The species name, “nudicaulis”, means “with a bare stem”.
Platyschkuhria integrifolia var. desertorum is a Colorado Plateau endemic and occurs in Carbon, Duchesne, Emery, Garfield, Grand (type specimen was collected from Cisco), San Juan, Sevier, Uintah and Wayne Counties in Utah and Delta, Mesa and Montrose Counties in Colorado.
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?
Lizards, including the colorful collared lizard, are one of the most frequently seen animals at Arches. When not chasing flies or basking in the sun, they are often seen doing what appears to be push-ups. This odd dance might enhance their stereoscopic vision, helping them see what's looking back at them.