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Species Brief

Parkinsonia microphylla, yellow paloverde

Written
July, 2026
Contributors
Ilana L. Abrahamson - 1st Compiler, Taryn R. Brahmsteadt - 1st Editor

Abrahamson, Ilana L., compiler. 2026. Species Brief: Parkinsonia microphylla, yellow paloverde. 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/parmic

DOI
10.2737/feis-species-brief-parmic

Scientific Name
Parkinsonia microphylla
Common Names
yellow paloverde
foothill paloverde
little-leaf paloverde
FEIS Lifeform Type
Shrub
Tree
Kingdom
Plantae
Class
Magnoliopsida (Dicot)
Order
Fabales
Family
Fabaceae
Genus
Parkinsonia
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—Biological, ecological, and fire-related characteristics about yellow paloverde. Asterisks indicate areas of uncertainty or discrepancy. When asterisks are used, text in the justification field describes the uncertainty or discrepancy. This table is derived from a standardized template. The template includes all possible characteristics for each attribute.
AttributeCharacteristicJustificationSource
Biological characteristics
Life formShrub; TreeYellow paloverde is a multi-stemmed shrub or small tree that often grows to 6 m tall but occasionally grows to 10 m.FEIS: Botanical Description [1]
Typical lifespan51-100 yearsYellow paloverde is slow-growing and long-lived. One study calculated that maximum lifespan was likely less than 200 years, with most plants living less than 100 years.FEIS: Plant Growth and Mortality [1]
Life cyclePerennialYellow paloverde is a long-lived, multi-stemmed shrub or small tree.FEIS: Botanical Description; Plant Growth and Mortality [1]
Drought toleranceHighYellow paloverde is drought-tolerant, although it typically requires bimodal precipitation with regular summer moisture. Extreme or prolonged drought can still cause widespread, episodic mortality.FEIS: Site Characteristics; Plant Growth and Mortality [1]
Rooting depthDeepYellow paloverde roots are generally deep and wide spreading. On rocky slopes, roots follow pockets of soil and narrow fissures in rocks where moisture accumulates and is sheltered from evaporation.FEIS: Botanical Description [1]
Bark thickness at maturityThin

Yellow paloverde has relatively thin, photosynthetic bark 3 to 4 mm thick that is mostly smooth and green and covers all twigs and branches.

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This thin bark makes it susceptible to damage and death from high fire temperatures.

FEIS: Botanical Description; Immediate Fire Effects [1]
Sheds low branchesSometimes*

During drought yellow paloverde drops its leaves, twigs, and branches, and large branches may die during extended drought.

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However, this is a drought-stress response rather than routine self-pruning of low branches.

FEIS: Plant Growth and Mortality [1]
Reproduction and Regeneration
Adventitious budsRoot crown; Root sprouts

Yellow paloverde can sprout from the root crown after top-kill from fire or drought, and it occasionally produces shoots from horizontal roots within several meters of the trunk.

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It does not typically reproduce vegetatively, and it is unclear whether the root sprouts are independent of the parent plant.

FEIS: Regeneration Processes; Vegetative Reproduction and Regeneration [1]
Time to reproductive maturityInsufficient informationThe source does not provide explicit information about the age at which yellow paloverde first reproduces.FEIS [1]
Soil seed bank longevityShort-term persistent (1-5 years)

Yellow paloverde has a small, at least short-term seed bank.

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It produces both dormant and nondormant seeds. Dormant seeds that are not removed by predators or destroyed by pathogens likely remain in the soil for a year or more before germinating, and seeds may germinate from a single cache over several years.

FEIS: Germination; Seed Banking [1]
Month(s) when seeds typically ripenMay*; June*; July*Seeds ripen and seed pods drop about 6 weeks after flowering (late March until May). Thus, seed ripening likely occurs from late spring to early summer.FEIS: Seasonal Development [1]
Serotinous conesN/AThis attribute applies to conifers. Yellow paloverde produces seed pods 3 to 13 cm long, each containing 1 to 5 seeds.FEIS: Botanical Description [1]
Seed dispersal mechanismAnimal; Gravity

Yellow paloverde seeds fall to the ground after the pods open.

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Seed-caching heteromyid rodents such as pocket mice and kangaroo rats are likely the primary seed predators and de-facto dispersers, moving seeds into cached clusters.

FEIS: Seed Dispersal [1]
Seed dispersal distance<100 m*

Within days of falling, almost all seeds are removed from beneath the parent canopy by seed predators, which cache them in small, dispersed clusters, often away from parent trees and under shrub canopy.

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Dispersal distances are not reported, but in Joshua tree, another rodent-dispersed desert dominant, rodents cached seeds an average of 30 m from parent plants, and young plants grew up to 251 m from potential parents.

FEIS: Seed Dispersal [1]; FEIS Joshua tree Species Review: Seed Dispersal [2]
Optimal conditions for seedling establishmentNurse plant/object

Seedlings often establish under the shelter of rocky areas or shrubs (particularly triangle bur ragweed and white bursage/burrobush) where they are protected from herbivores.

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Seedlings growing in open microsites are often eaten by lagomorphs and rodents.

FEIS: Seedling Establishment and Mortality [1]
Successional Status
Shade toleranceModerately shade tolerant*

The source does not provide explicit information about yellow paloverde's shade tolerance; however, it is dominant in open Sonoran desert scrub communities.

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Seedlings often establish under the shelter of nurse shrubs or in sheltered rocky areas, which serve to protect them from herbivores. Given establishment occurs under protective cover, it is likely that yellow paloverde seedlings tolerate shade.

FEIS: Seedling Establishment and Mortality; Plant Communities [1]
Successional statusLate*

In Sonoran desert scrub, yellow paloverde is a long-lived dominant suggesting that it is a late successional species.

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However, successional dynamics in desert systems are not well described because disturbances were historically rare and succession slow.

FEIS: Plant Communities; Successional Status [1]
Fire
Primary fire response(s) or adaptation(s)Recover/Resprout*; Fire Sensitive

Although yellow paloverde may resprout after top-kill or injury from fire, observations suggest that it is more likely to be killed.

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Postfire mortality rates often exceed 70% within the first few years. Because it is a weak sprouter, postfire recovery is largely dependent on establishment from seeds. Yellow paloverde populations are slow to recover after fire.

FEIS: Fire Adaptations; Plant Response to Fire [1]
Germination is fire stimulatedRarely/No*

Yellow paloverde produces both dormant and nondormant seeds; nondormant seeds germinate under warm, moist conditions after summer rains.

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Dormant seeds have a thick seed coat, and seed predators or weathering may scarify them, which hastens germination. One study reported a seedling flush after fire, but this was attributed to seed bank survival.

FEIS: Germination; Immediate Fire Effects [1]
Flowering/fruiting is fire stimulatedRarely/No*

Given that yellow paloverde is easily killed by fire, it is unlikely that flowering and fruiting are fire stimulated.

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However, the source does not provide explicit information about flowering or fruiting after fire.

FEIS: Immediate Fire Effects; Fire Adaptations [1]
Season when it is most sensitive to fireFire sensitivity does not vary by season*

Yellow paloverde is easily killed by fire; even low-intensity fire can sear its thin bark and kill its cambium, so fires of any season are likely to kill it.

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It is a weak sprouter, so postfire recovery depends largely on seedlings, which have higher survival in wetter periods (mid-summer and winter) than in dry periods.

FEIS: Immediate Fire Effects; Fire Adaptations [1]
Plant flammabilityLow*

Yellow paloverde plants often contain some dead branches and twigs, but living stems have relatively high xylem water potentials and may be more hydrated than other Sonoran Desert plants, so their canopies are more likely to resist burning than the litter and grasses beneath them.

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Plants may char and scorch but are rarely entirely consumed by fire.

FEIS: Fuel Characteristics [1]
Early colonizer/recolonizer of burned or disturbed sitesRarely/No*

Given that seed and seedling predation rates are high and seedling establishment and survival rates are low, yellow paloverde postfire seedling establishment is also likely to be low, and it is a weak resprouter.

More

Information on yellow paloverde postfire seedling establishment is limited and largely anecdotal. Yellow paloverde populations are slow to recover after fire.

FEIS: Plant Response to Fire [1]
Effect of fire exclusion on populationN/A*

Given that fires were historically rare in Sonoran desert scrub communities, fire exclusion has not occurred on a time scale relevant to these communities.

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However, yellow paloverde is easily damaged and often killed by fire and postfire recovery is slow, so excluding fire likely benefits its populations by minimizing fire-related mortality and maintaining historical fire regimes.

FEIS: Fire Regimes; Fire Management Considerations [1]
Is this species typically managed with prescribed fire?Sometimes*

Fire is generally considered harmful to yellow paloverde communities, and management should focus on excluding fire.

More

Prescribed fire is not used to manage native Sonoran desert scrub, though nonnative pastures are often burned to kill yellow paloverde and other woody plants.

FEIS: Fire Management Considerations [1]
Predominant historical fire frequency where it most commonly occursInfrequentFire is considered to have been rare to absent in presettlement Sonoran Paloverde-Mixed Cacti Desert Scrub, and mean historical fire intervals derived from LANDFIRE succession modeling are estimated to exceed 1,000 years.FEIS: Fire Regimes [1]; LANDFIRE Biophysical Settings (below)
Predominant historical fire severity where it most commonly occursReplacement*

Little information is available regarding the historic fire severity in Sonoran communities.

More

Historically, small or patchy fires were thought to be infrequent and replacement fires rare to absent in yellow paloverde communities. However, LANDFIRE succession modeling estimates that infrequent fires were replacement severity.

FEIS: Fire Regimes; Successional Status [1]; LANDFIRE Biophysical Settings (below)
Predominant historical fire regime group where it most commonly occurs5LANDFIRE classifies Sonoran desert scrub communities in fire regime group 5 (infrequent replacement severity).FEIS: Fire Regimes [1]; LANDFIRE Biophysical Settings (below)
Alters historical fuel characteristics of ecosystems where it occursRarely/No

In most years, fuels in yellow paloverde’s desert scrub communities are naturally sparse, discontinuous, and insufficient to carry fire.

More

Contemporary changes in fuel characteristics on invaded sites may be driven by nonnative invasive grasses such as buffelgrass and red brome, not by yellow paloverde itself.

FEIS: Fuel Characteristics [1]

2020 LANDFIRE Biophysical Settings — Historical Fire Regime Characteristics
Biophysical SettingMean Fire Interval (years)Fire Severity Percent (%)
CodeFire Regime GroupLowMixedReplacementAllLowMixedReplacement
Series 10900 - Sonoran Granite Outcrop Desert Scrub
10900_14V-B51351300100
Series 10910 - Sonoran Mid-Elevation Desert Scrub
10910_13_14IV-B10410400100
10910_15V-A35535500100
Series 11090 - Sonoran Paloverde-Mixed Cacti Desert Scrub
11090_4_13V-B1284128400100
11090_14V-B1056105600100
11090_15_25V-B1049104900100
Series 10820 - Mojave Mid-Elevation Mixed Desert Scrub
10820_12_15_16_17_23_24V-B81581500100
Summary
Minimum10410400100
Maximum1284128400100
Mean73973900100
Median81581500100
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]

1. Helmy, Olga E. 2022. Parkinsonia microphylla, yellow paloverde. 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/parmic

2. Brahmsteadt, Taryn R. 2025. Yucca brevifolia, Yucca jaegeriana, Joshua tree. 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/yucspp

Last updated October 14, 2026