ClimateWatch

An initiative of Earthwatch Institute

  1. 227 Flowering photo by Biota Environmental Sciences
  2. 227_0 Photo by Rich Weatherill
  3. 227_1 Fruit photo by Rich Weatherill
  4. 227_2 Dried Fruit by Rich Weatherill
  5. Wickhams_grevillea Flowering by Michael J. Barritt
  6. Wickhams_grevillea_by_flickr_id_eyeweed Fruit and Flowering by Eyeweed (Flickr ID)

Wickham's Grevillea or Arajukaljukua

Grevillea wickhamii

Appearance

  • A shrub or small spindly tree.
  • Size: 1 to 4 m tall.
  • Leaves: Simple 2.5 to 9 cm long, 2.5 to 5.5 cm wide.  They are distinctively pruinose (frosted in appearance) and the leaf margins are serrated and prickly.
  • Flowers: Cream, yellow or red irregular flowers, they are mainly red in the Pilbara region.
  • Fruit: Oblong or ellipsoidal, and glabrous (has no hairs).

What to Observe

  • First fully open single flower
  • Full flowering (record all days)
  • End of flowering (when 95% of the flowers have faded)
  • Not flowering
  • Fruit fully ripened / berry reached full size (record all days)

ClimateWatch Science Advisor

We expect plants to start shooting and flowering earlier in the year as a result of climate change warming the Earth. They may also start appearing in new areas, as warmer temperatures enable them to live in environments that were previously too cold for them.

When To Look

  • April to October

Where To Look

  • Widespread in northern Western Australia, and inland regions of Northern Territory, South Australia and western Queensland.
  • Look around sand or loam, stony or skeletal soils, laterite, sandstone, limestone, and quartzite. It can be found on sand dunes, plains, rocky hills & gullies, cliffs or ridges, along creek lines.

Wickham's Grevillea or Arajukaljukua distribution map - OzNativePlants

Wickham's Grevillea or Arajukaljukua distribution map - OzNativePlants

Where To Look

Maps of Habitat Suitability

Grevillea_wickhamii-wickhams_grevillea

Current probability
of occurrence
2070 probability
of occurrence (RCP 8.5)
Species range change from
current to 2070 probability

Above, the left and middle maps show the modelled habitat suitability for the the species under current and potential future climate conditions. The colours indicate the predicted habitat suitability from low (white) to high (dark red).

The future habitat suitability is modelled for the year 2070 under a climate change scenario that represents 'business as usual' (RCP 8.5). The map on the right shows how the range of the species might change between now and 2070, with orange areas indicating where the species might disappear, green areas where the species range might expand, and blue areas where the habitat is predicted to be suitable for the species now and in the future.

The models for this species were run in the Biodiversity and Climate Change Virtual Laboratory. Please note that while models can be very informative, they are only a representation of the real world and thus should always be viewed with caution. You can read more about the science behind these models here.

Sightings

References

Woodley M et al. Wangalili Yindjibarndi and Ngarluma Plants. Juluwaru Aboriginal Corporation.

  1. Search Species

  1. What Else?

    It is not easily mistaken for anything else.

  1. Did You Know?

    There are six recognised subspecies.

    It is named after John Clements Wickham (1798 - 1864), 1st lieutenant on HMS Beagle 1831 - 36 (Darwin's expedition); commanded the ship in WA waters 1837 - 38; later government resident at Moreton Bay, Queensland.