Index of Species Information

SPECIES:  Acamptopappus sphaerocephalus


SPECIES: Acamptopappus sphaerocephalus
Photo 2004, Michelle Cloud-Hughes.

AUTHORSHIP AND CITATION : Griffith, Randy Scott. 1991. Acamptopappus sphaerocephalus. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: [].

ABBREVIATION : ACASPH SYNONYMS : Aplopappus sphaerocephalus Harvey & Gray SCS PLANT CODE : ACSP ACSPH ACSPS2 COMMON NAMES : rayless goldenhead TAXONOMY : The currently accepted scientific name of rayless goldenhead is Acamptopappus sphaerocephalus (Harv. & Gray) Gray (Asteraceae) [7,10,20]. There are two recognized varieties: Acamptopappus sphaerocephalus var. sphaerocephalus and A. s. var. hirtellus Blake [10]. LIFE FORM : Shrub FEDERAL LEGAL STATUS : No special status OTHER STATUS : NO-ENTRY


SPECIES: Acamptopappus sphaerocephalus
GENERAL DISTRIBUTION : Rayless goldenhead occurs in desert regions of the southwestern United States [7,10,20]. In the Mojave Desert it occurs in northwestern Arizona, southeastern California, and southwestern Nevada. It is also found in the southern reaches of the Great Basin Desert in north-central Arizona, western Colorado, northwestern New Mexico, southeastern Nevada, and southern Utah [2,7,10,14]. ECOSYSTEMS : FRES30 Desert shrub FRES33 Southwestern shrubsteppe FRES35 Pinyon - juniper FRES40 Desert grasslands STATES : AZ CA CO NV NM UT BLM PHYSIOGRAPHIC REGIONS : 4 Sierra Mountains 6 Upper Basin and Range 7 Lower Basin and Range 12 Colorado Plateau KUCHLER PLANT ASSOCIATIONS : K023 Juniper - pinyon woodland K039 Blackbrush K040 Saltbush - greasewood K041 Creosotebush K042 Creosotebush - bursage K057 Galleta - threeawn shrubsteppe SAF COVER TYPES : 68 Mesquite 239 Pinyon - juniper 242 Mesquite SRM (RANGELAND) COVER TYPES : NO-ENTRY HABITAT TYPES AND PLANT COMMUNITIES : Rayless goldenhead may be associated with catclaw acacia (Acacia greggii), California juniper (Juniperus californica), scrub oak (Quercus turbinella), Joshua tree (Yucca brevifolia), California buckwheat (Eriogonum fasciculatum), golden cholla (Opuntia echinocarpa), and Mojave yucca (Y. schidigera) [2,3].


SPECIES: Acamptopappus sphaerocephalus
IMPORTANCE TO LIVESTOCK AND WILDLIFE : Sheep browse rayless goldenhead when better forage is unavailable [7,15]. PALATABILITY : NO-ENTRY NUTRITIONAL VALUE : NO-ENTRY COVER VALUE : NO-ENTRY VALUE FOR REHABILITATION OF DISTURBED SITES : NO-ENTRY OTHER USES AND VALUES : NO-ENTRY OTHER MANAGEMENT CONSIDERATIONS : Browsing may significantly reduce the mean cover and mean shrub height of rayless goldenhead. Heavy browsing is more detrimental than light browsing [15].


SPECIES: Acamptopappus sphaerocephalus
Photo 2003, James M. Andre.

GENERAL BOTANICAL CHARACTERISTICS : Rayless goldenhead is a native shrub. Generally it is less than 3.3 feet (1 m) tall. The stems are much branched with white bark; the bark becomes shreddy with age. The leaves are alternate, entire, and spatulate. Flowerheads are yellow, discoid, and arranged in a cyme. The fruit is an achene [7,10,16,20]. RAUNKIAER LIFE FORM : Phanerophyte REGENERATION PROCESSES : Little information is available on rayless goldenhead reproduction. All the cyme flowers are fertile [16]; however, Young and Young [18] reported "only limited germination at low incubation temperatures." Seeds collected in Riverside County, California, and germinated in a greenhouse showed "poor to good germination." Outplanted seedlings showed a 41 percent success rate after 2 or 3 years [22]. Sprouting capacity of this species is unknown. SITE CHARACTERISTICS : Rayless goldenhead occupies open, sandy to rocky bajadas, washes, limestone ridges, dry plains, and mesas [7,12]. Its distribution is clumped [3]. Soil: Rayless goldenhead is found in Alfisol, Aridisol, and Mollisol soil types [17]. Elevation: Rayless goldenhead grows at elevations of 1,000 to 4,500 feet (305-1,370 m) in Arizona [7] and 200 to 7,260 feet (60-2,200 m) in California [20]. SUCCESSIONAL STATUS : Facultative Seral Species Rayless goldenhead exhibited no distinct successional pattern on disturbed sites in the Mohave Desert. It is considered a short to moderately long-lived species that may occur in disturbed to climax creosotebush (Larrea tridentata) communities [14,21]. In some cases, rayless goldenhead populations may increase rapidly when long-lived species such as creosotebush, ragweed (Ambrosia dumosa), and Nevada ephedra (Ephedra nevadensis) are reduced by disturbance [21]. SEASONAL DEVELOPMENT : Rayless goldenhead flowers from April to June in California [10] and April to October in Arizona [7].


SPECIES: Acamptopappus sphaerocephalus
FIRE ECOLOGY OR ADAPTATIONS : Since rayless goldenhead seed is dormant and species distribution is clumped, rayless goldenhead probably establishes from on-site, soil-stored seed. There is no information available on rayless goldenhead fire survivorship or postfire regeneration. FIRE REGIMES : Find fire regime information for the plant communities in which this species may occur by entering the species name in the FEIS home page under "Find Fire Regimes". POSTFIRE REGENERATION STRATEGY : NO-ENTRY


SPECIES: Acamptopappus sphaerocephalus


SPECIES: Acamptopappus sphaerocephalus
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