Exploring Orchids at Dempster Head: A Local Hotspot

Dempster Head, Esperance, Western Australian Orchids

12/08/2025

A local orchid hotspot is the granite headland we call Dempster Head. We also refer to it as the Rotary Lookout for a very obvious reason!!
It being a beautiful, cloudless, sunny winters day, what better way to spent it than searching for the usual orchid suspects.

The first orchid found is the Mosquito orchid (Cyrtostylis robusta) which flower between June and August over a southerly range from Perth to Israelite Bay.
I located my orchids flowering under overhanding bushes on the walk trail edges. The ground hugging circular leaves grow in large numbers and are what you first notice. Then on a closer inspection you discover a few flowering specimens.


Snail orchids are also found scattered around the site. The exact species is difficult to name due to both Pterostylis voigtii and P. meridionalis named as growing in this region.
Both these orchids are smaller, grow in shallow soil pockets on granite outcrops, have bloated appearance, flared petals and slightly thickened lateral sepals.
Either they are the Eastern granite snail orchid or the Southern thick-sepaled snail orchid.
I have named as I believe them to be, however, any assistance in identifying these little guys would be appreciated.


Next up is an orchid that appears to have a restricted range in the Esperance region. The Spectacled donkey orchid (Diuris conspicillata) is listed as growing in shallow soil pockets on coastal granite outcrops in the Esperance area, which Dempster Head is an example of.
They get their name from the dark markings on the inner part of the labellum lateral lobes, which gives an impression of wearing glasses.
They are found scattered over Dempster Head usually in exposed areas but protected by a surrounding prickly shrub.


Another orchid with round ground hugging leaves is found, also growing underneath over hanging bushes.
The Crystal helmet orchid (Corysanthes limpida) is found from Walpole to Israelite Bay growing in sandy soils in coastal woodlands and shrublands.
When you come across the leaves you could mistake them for Mosquito orchids however the flowers are much shorter until they are fertilised, at which time the stem can extend up to 300mm in height.
Similarly to the Mosquito orchids, many leaves may be found but usually only a handful will produce flowers.


Not too bad a day with finding some orchids. Amazingly all orchids found belonged to a different genus.
Pterostylis, Cyrtostylis, Diuris and Corysanthes.

Amazingly I am posting this exactly 1 year later. Today however is not a beautiful fine sunny winters day, but a cold overcast winters day, hence I have time indoors to complete this post.

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04/09/2022 ….. Father’s Day Findings Pt. I

Dempster Head, Esperance, Western Australian Orchids

Father’s Day breakfast enjoyed at my son’s home with his little family. After stuffing ourselves, we all venture up to Dempster Head to walk off the excess joules. ๐Ÿ™‚ It is during our walk that we encounter the following orchids.


Often crossed lateral sepals

Spectacled donkey orchid (Diuris conspicillata)

Distribution & Habitat: Restricted to the Esperance area, growing in shallow soil pockets on coastal granite outcrops.

Up to 6 flowers per orchid

Stand up to 90mm in height.

Eastern granite snail orchid (Pterostylis voightii)

Distribution & Habitat: Found between Albany & Israelite Bay, growing in shallow soil pockets on granite outcrops.

Thickened lateral sepals.

Very long sepals

White spider orchid ?? (Caladenia sp.)

Unknown species of spider orchid.

Greenish tones to petals and sepals

Up to 3 flowers per orchid

Esperance white spider orchid (Caladenia crassa)

Distribution & Habitat: Found between Bremer Bay and Israelite Bay, growing in clay and sandy-clay soils in seasonally moist woodlands and shrublands. Flowers best in the season following summer fire.

Flowers are 80-140mm across

Standing 50-150mm in height

Western tiny blue orchid (Cyanicula aperta)

Distribution & Habitat: Found between Dumbleyung and Mt Ragged, growing in sandy, sandy-clay and lateritic soils in woodlands and scrublands.

Bluish-mauve flowers

Short spreading petals and sepals

Pink fairies (Caladenia latifolia)

Distribution & Habitat: Found between Kalbarri and Israelite Bay, growing in sandy and sandy-clay soils in forests, woodlands and shrublands. In inland areas the species grows on low rises beside salt lakes and occasionally on granite outcrops. Also found in SA, VIC and TAS.

Stand 120-450mm in height

Ground hugging leaf 20-30mm round

Crystal helmet orchid (Corybas limpidus) (Corysanthes limpidus)

Distribution & Habitat: Found between Walpole and Israelite Bay, growing in sandy soils in coastal woodlands and shrublands.

Green and burgundy blotched flower

Broad labellum

Mosquito orchid (Cyrtostylis robusta)

Distribution & Habitat: Found between Perth and Israelite Bay, growing in sandy, sandy-clay and granitic soils in forests, woodlands and shrublands. Northeast of Esperance the species occupies shallow soil pockets on granite outcrops.

Ground hugging leaf, 10-30mm round

Stands 250-500mm in height.

Esperance king spider orchid (Caladenia decora)

Distribution & Habitat: Found between Bremer Bay and Cape Arid, growing in sandy-clay and clay soils in woodlands and shrublands.

Four of more rows of calli

Saying goodbye to the kids, grandkids and Deb C, we head north for our next location. Here we check out the burnt patch north of Gibson.