Acamptopappus sphaerocephalus, Rayless Goldenhead
Scientific Name: Acamptopappus sphaerocephalus
Common Name: Rayless Goldenhead
Also Called: Goldenhead
Family: Asteraceae, Sunflower Family
Size: Up to 3 feet
Growth Form: Shrub, subshrub; mostly glabrous, branching at base, ascending and erect, base woody, gray or whitish stems, new growth green, note; variety "hirtellus"; has small dense hairs.
Leaves: Green; small, alternate, linear, lanceolate or oblanceolate, appressed along stem, lower leaves fascicled or clustered.
Flower Color: Yellow; disk flowers only, 13 to many, flower heads spheric or globose, single or clustered heads on short stalks on tips of new growth stems, fruit an achene, pappus light to brownish bristles.
Flowering Season: April to October.
Elevation: 1,000 to 4,500 feet.
Habitat Preferences: Upper desert areas, pinyon-juniper communities, mountain slopes, open flats or plains, mesas, rocky areas and gravelly soil.
Recorded Range: A southwestern species in the United States, Rayless Goldenhead is found in AZ, CA, NV and UT. In Arizona, it occurs in the western half of the state and also in Graham County.
North America & US County Distribution Map for Acamptopappus sphaerocephalus.
U.S. Weed Information: No data available.
Invasive/Noxious Weed Information: No data available.
Wetland Indicator: No data available.
Threatened/Endangered Information: No data available.
Acamptopappus sphaerocephalus var. hirtellus, Rayless Goldenhead (AZ, CA, NV);
Acamptopappus sphaerocephalus var. sphaerocephalus, Rayless Goldenhead (AZ, CA, NV, UT).
Comments: Rayless Goldenhead is a southwestern species with a tendency or partiality of the majority of its populations toward the western geographic area of the Mojave Desert and some species extend north into the Great Basin Desert. Thus, Rayless Goldenhead is found in the Sonoran, Mojave and Great Basin Deserts.