Fauna
Plant · GBIF taxon 3129915

Desert Broom

Baccharis sarothroides

Also known as Broom Baccharis, Greasewood, Rosin-Bush, Groundsel

Desert broom thrives as a resilient pioneer shrub across the arid American Southwest and northern Mexico, rapidly colonizing gravelly washes and disturbed roadsides. Its dense, broom-like green stems carry out most of the plant's photosynthesis while minimizing moisture loss under intense desert heat. In autumn, female bushes explode into billowing masses of silvery, cotton-like seed heads that drift across the landscape on desert breezes.

DesertDrought-TolerantPioneer Species
Desert Broom reference1 / 7
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—observations
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Not EvaluatedConservation statusIUCN Red List categoriesLCNTVUENCREWEXNot Evaluated — not placed on the risk ladderRed List categories, explained →
Key facts
Diet & prey
  • Autotrophic (photosynthesis)
Predators
  • Desert Cottontail
  • Mule Deer
  • Baccharis Gall Midge
ThreatsHerbicidal eradication, land development, and fire clearance
HabitatsDesert washes, roadsides, disturbed soils, and arid canyons
Life span15–30 years
Classification
  1. OrderAsterales
  2. FamilyAsteraceae
  3. GenusBaccharis
  4. SpeciesBaccharis sarothroides
Range & activity
Range data is not available yet.
Safe observation
Interaction riskLow
  1. Low
  2. Moderate
  3. High
  4. Very high
Why interaction risk is low
Male flowers release prolific airborne pollen in autumn; maintain distance if sensitive to respiratory allergens.
Why it is dangerous
Male shrubs shed dense clouds of fine pollen that trigger severe allergic rhinitis, asthma flares, and conjunctivitis.
How to recognize a risky encounter
Look for dense clusters of nearly leafless, resinous green stems covered in tiny yellowish flower heads during autumn.
What to do
Wear a pollen mask during autumn winds or stay indoors if you have active seasonal desert allergies.
Responsible observation
  • Seasonal Timing: Watch in late autumn when female shrubs erupt into dense clouds of white seed fluff.
  • Fire Safety: Clear dried interior twigs away from structures, as mature bushes are extremely resinous and flammable.
  • Wildlife Observation: Inspect the twiggy green canopy for camouflaged mantises, praying insects, and sheltering birds.
Related species
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