Species Brief
Encelia farinosa, white brittlebush
Written
July, 2026
Contributors
Taryn R. Brahmsteadt - 1st Compiler, Ilana L. Abrahamson - 1st Editor
Brahmsteadt, Taryn R., compiler. 2026. Species Brief: Encelia farinosa, white brittlebush. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Missoula Fire Sciences Laboratory (Producer). Available: https://research.fs.usda.gov/feis/species-briefs/encfar
Scientific Name
Encelia farinosa
Common Names
white brittlebush
brittlebush
goldenhills
hierba del bazo
incienso
white brittle bush
FEIS Lifeform Type
Shrub
Subshrub
Kingdom
Plantae
Class
Magnoliopsida (Dicot)
Order
Asterales
Family
Asteraceae
Genus
Encelia
Nativity
Native
Invasiveness
Noninvasive
This Species Brief is a concise summary of the biological, ecological, and fire‑related characteristics of an individual species derived from a Fire Effects Information System (FEIS) Species Review. Table 1 is derived from a standardized template and highlights these characteristics.
| Attribute | Characteristic | Justification | Source |
|---|---|---|---|
| Biological characteristics | |||
| Life form | Shrub | White brittlebush is a shrub that can grow to 1 m tall. | FEIS: Botanical Description [1] |
| Typical lifespan | 11-20 years | White brittlebush is relatively short-lived, with an average lifespan of 16 years in the northern Sonoran Desert. The maximum is much longer, with at least one individual surviving at least 72 years. | FEIS: Plant Growth and Mortality [1] |
| Life cycle | Perennial | White brittlebush is a woody shrub with an average lifespan of 16 years in the northern Sonoran Desert. | FEIS: Plant Growth and Mortality [1] |
| Drought tolerance | High | White brittlebush is drought tolerant and has an affinity for warm, dry sites. | FEIS: Site Characteristics [1] |
| Rooting depth | Shallow | White brittlebush has a relatively shallow root system with a taproot, lateral roots, and filamentous roots. Its taproot depth is often limited by impassable soil layers, such as caliche. | FEIS: Botanical Description [1] |
| Bark thickness at maturity | N/A | This attribute applies to trees. | FEIS: Botanical Description [1] |
| Sheds low branches | N/A | This attribute applies to trees. | FEIS: Botanical Description [1] |
| Reproduction and Regeneration | |||
| Adventitious buds | Root crown | White brittlebush can resprout from the root crown after top-kill, although it is generally a poor resprouter. | FEIS: Vegetative Reproduction and Regeneration [1] |
| Time to reproductive maturity | 0-1 year | Plants may flower and set seed in their first year, and one study reported that postfire resprouts flowered and set seed within the first year after fire. | FEIS: Seed Production and Predation [1] |
| Soil seed bank longevity | Short-term persistent (1-5 years)* | One study indicates white brittlebush has at least a short-term persistent, soil-stored seed bank, with seeds shown to remain viable in the soil at least 11 months after dispersal. | FEIS: Seed Banking [1] |
| Serotinous cones | N/A | This attribute applies to conifers. White brittlebush is a flowering shrub whose disk flowers produce achenes. | FEIS: Botanical Description [1] |
| Seed dispersal mechanism | Gravity; Wind; Animal | Seeds are relatively light and primarily disperse short distances by gravity and wind, but also likely by animals. Rodents may cache seeds and birds may scatter them. | FEIS: Seed Dispersal [1] |
| Seed dispersal distance | Short (mostly under parent plant); Medium* | Seeds are primarily dispersed short distances and generally concentrated under white brittlebush canopies. Strong winds are likely needed to disperse seeds long distances. However, animal-assisted dispersal may contribute to longer, unquantified dispersal distances. | FEIS: Seed Dispersal [1] |
| Optimal conditions for seedling establishment | Sun*; Bare soil* | White brittlebush seedling establishment is typically low and is positively associated with precipitation. Although not explicitly stated, white brittlebush is often considered a pioneer species, and its seedlings often establish in large numbers after fire. This suggests it establishes in sunny conditions and mineral soil, rather than shaded areas. | FEIS: Seedling Establishment and Mortality; Successional Status, Plant Response to Fire [1] |
| Successional Status | |||
| Shade tolerance | Shade intolerant* | While not explicitly stated as shade intolerant, white brittlebush has an affinity for warm, dry sites, dominates open desert scrub, and can form nearly monospecific stands on burned and disturbed sites. | FEIS: Site Characteristics; Plant Communities; Successional Status [1] |
| Successional status | Early; Mid; Late | White brittlebush is often considered a pioneer species, often dominating disturbed sites. However, it is also prevalent in later stages of succession. | FEIS: Successional Status [1] |
| Fire | |||
| Primary fire response(s) or adaptation(s) | Recruit; Recover/Resprout* | White brittlebush is easily damaged by fire and is often killed or top-killed. Postfire regeneration is primarily from seeds, with seedlings that readily establish in postfire environments. It can also resprout after top-kill, although resprouting varies widely with fire intensity, aspect, and plant age. | FEIS: Plant Response to Fire; Fire Adaptations; Immediate Fire Effects [1] |
| Germination is fire stimulated | Rarely/No | Mass germination follows large rainfall events rather than fire. No information was available on the effects of heating or burning on the seeds. High postfire seedling numbers apparently reflect favorable postfire environments rather than heat or smoke germination cues. | FEIS: Germination; Plant Response to Fire [1] |
| Flowering/fruiting is fire stimulated | Rarely/No | Flowering is triggered by cool-season rainfall and temperature, not fire. Burning may reduce flowering and fruiting density, with fewer flowers and fruits per unit area in burned than unburned plots, but data are limited. | FEIS: Seed Production and Predation; Plant Response to Fire [1] |
| Season when it is most sensitive to fire | Insufficient information | Season when white brittlebush is most sensitive to fire is not explicitly described. White brittlebush populations may be reduced by fire if fine fuels are sufficiently dense, especially when fires are fueled by invasive perennial grasses, or if fire intervals are very short. White brittlebush germinates after cool-season or late summer precipitation and grows new leaves throughout the cool season. | FEIS: Seasonal Development; Plant Response to Fire [1] |
| Plant flammability | High* | White brittlebush branches have high resin and oil contents, suggesting they are highly flammable when dry; however, plants are rarely entirely consumed by low-intensity fires, so flammability depends on dryness and fire intensity. | FEIS: Fuel Characteristics [1] |
| Early colonizer/recolonizer of burned or disturbed sites | Frequently | High numbers of white brittlebush seedlings may establish after fire, sometimes forming nearly monotypic stands, and it is more abundant and more prominent in recently burned than long unburned areas. | FEIS: Successional Status; Plant Response to Fire [1] |
| Effect of fire exclusion on population | N/A* | Given that desert scrub communities historically had long fire intervals, it is unlikely that fire exclusion has affected white brittlebush populations in communities where it most commonly occurs. White brittlebush is more abundant and more prominent in recently burned than long unburned areas and may become more prevalent after disturbances including fire, so increasing fire frequency may increase in white brittlebush populations. | FEIS: Plant Response to Fire; Successional Status [1] |
| Is this species typically managed with prescribed fire? | Rarely/No | In the Mojave and Sonoran deserts, fire is generally considered harmful and the primary management strategy is fire prevention. In coastal sage scrub and chaparral, prescribed fire is generally not recommended except in strategic fuel-reduction locations. | FEIS: Fire Management Considerations [1] |
| Predominant historical fire frequencies of ecosystem where it most commonly occurs | Infrequent; Mid-frequency | White brittlebush spans communities with vastly different historical mean fire intervals, from over 1,000 years in Sonoran paloverde-mixed cacti desert scrub (infrequent) to coastal sage scrub and chaparral modeled at 150 and 51 years (mid-frequency). | FEIS: Fire Regimes [1] |
| Predominant historical fire severity where it most commonly occurs | Replacement | LANDFIRE modeling assigns 100% replacement-severity fire to the desert scrub, coastal scrub, and chaparral settings where white brittlebush is most common. | FEIS: 2020 LANDFIRE Biophysical Settings [1] |
| Predominant historical fire regime group where it most commonly occurs | 5; 4 | LANDFIRE Biophysical Settings list desert scrub communities as group V (200+ years, replacement) and coastal scrub and chaparral as group IV (36-200 years, replacement). | FEIS: 2020 LANDFIRE Biophysical Settings [1] |
| Alters historical fuel characteristics of ecosystems where it occurs | Rarely/No* | Increased receptive fuel loads and more frequent, larger, and more severe fires are attributed to nonnative invasive grasses and human ignitions rather than to white brittlebush itself. | FEIS: Fuel Characteristics; Fire Regimes [1] |
| Biophysical Setting | Mean Fire Interval (years) | Fire Severity Percent (%) | ||||||
|---|---|---|---|---|---|---|---|---|
| Code | Fire Regime Group | Low | Mixed | Replacement | All | Low | Mixed | Replacement |
| Series 11090 - Sonoran Paloverde-Mixed Cacti Desert Scrub | ||||||||
| 11090_4_13 | V-B | 1284 | 1284 | 0 | 0 | 100 | ||
| 11090_15_25 | V-B | 1049 | 1049 | 0 | 0 | 100 | ||
| 11090_14 | V-B | 1056 | 1056 | 0 | 0 | 100 | ||
| Series 10820 - Mojave Mid-Elevation Mixed Desert Scrub | ||||||||
| 10820_12_15_16_17_23_24 | V-B | 815 | 815 | 0 | 0 | 100 | ||
| 10820_14 | V-A | 406 | 406 | 0 | 0 | 100 | ||
| 10820_4_13 | V-A | 399 | 399 | 0 | 0 | 100 | ||
| Series 10870 - Sonora-Mojave Creosotebush-White Bursage Desert Scrub | ||||||||
| 10870_4_6_12_13_14_15_17_24_25 | V-A | 329 | 329 | 0 | 0 | 100 | ||
| Series 10900 - Sonoran Granite Outcrop Desert Scrub | ||||||||
| 10900_14 | V-B | 513 | 513 | 0 | 0 | 100 | ||
| Series 10920 - Southern California Coastal Scrub | ||||||||
| 10920_4 | IV-B | 150 | 150 | 0 | 0 | 100 | ||
| Series 10960 - California Maritime Chaparral | ||||||||
| 10960_4 | IV-B | 124 | 124 | 0 | 0 | 100 | ||
| Series 11100 - Southern California Dry-Mesic Chaparral | ||||||||
| 11100_4 | IV-A | 51 | 51 | 0 | 0 | 100 | ||
| Series 11550 - North American Warm Desert Riparian Systems | ||||||||
| 11550_13_14 | I-C | 23 | 785 | 23 | 0 | 97 | 3 | |
| 11550_15 | III-A | 83 | 777 | 75 | 0 | 90 | 10 | |
| 11550_4 | I-C | 23 | 788 | 23 | 0 | 97 | 3 | |
| Series 11552 - North American Warm Desert Riparian Systems - Stringers | ||||||||
| 11552_13_14_15 | V-B | 735 | 735 | 0 | 0 | 100 | ||
| Summary | ||||||||
| Minimum | 23 | 51 | 23 | 0 | 0 | 3 | ||
| Maximum | 83 | 1284 | 1284 | 0 | 97 | 100 | ||
| Mean | 43 | 617 | 469 | 0 | 19 | 81 | ||
| Median | 23 | 735 | 399 | 0 | 0 | 100 | ||
| Percentage of fires in 3 fire severity classes, derived from LANDFIRE succession modeling. Replacement-severity fires cause >75% kill or top-kill of the upper canopy layer; mixed-severity fires cause 26%-75%; low-severity fires cause <26%. | ||||||||
| LANDFIRE. 2020. Biophysical settings models and descriptions, [Online]. Washington, DC: U.S. Department of Agriculture, Forest Service; U.S. Department of the Interior; U.S. Geological Survey; Arlington, VA: The Nature Conservancy, (Producers). Available: https://www.landfirereview.org/search.php [96496] | ||||||||
- Brahmsteadt, Taryn R. 2024. Encelia farinosa, white brittlebush. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Missoula Fire Sciences Laboratory (Producer). Available: https://research.fs.usda.gov/feis/species-reviews/encfar
Last updated August 21, 2026