If you have walked through Kings Park or Bold Park in Perth, you have walked among Macrozamia fraseri — the cycad of the Swan Coastal Plain. For decades, the guidebooks called it Macrozamia riedlei. They were wrong. It was not until the end of the 20th century that Ken Hill’s revision restored this species to its rightful identity: the first Macrozamia to be formally named in Western Australia, described by Miquel in 1842 — and then lost in a nomenclatural fog for 150 years as Gardner and Bennett lumped all three southwestern Australian Macrozamia species under the single name M. riedlei. The restoration revealed a plant with a distinct set of characters: robustly arborescent (trunk to 3 m, up to 105 cm in diameter), distinctly keeled leaves (the V-shaped rachis profile that M. riedlei lacks), densely woolly crowns, and the largest cones of any Western Australian Macrozamia — pineapple-like structures up to 50 cm long containing up to 160 seeds. It grows not in the jarrah forest (that is M. riedlei‘s domain) but in low heath and shrubland on deep sand, on the coastal plain and the Geraldton Sandplains — from Mandurah through Perth to Enneabba and beyond to Jurien Bay.
The Noongar people know it as djiridji, and it is this species — not M. riedlei — that formed the staple zamia food of the Perth and Swan River Aboriginal communities, processed by the mordak fermentation technique described by the earliest European observers from Barker (1830) through Grey (1841) to Drummond (1862). It belongs to the genus Macrozamia — the largest exclusively Australian cycad genus, with around 40 species — and within that genus it is the most robust of the three Western Australian species.
Quick Facts
| Scientific name | Macrozamia fraseri Miq. |
| Family | Zamiaceae |
| Origin | Southwestern Western Australia (Swan Coastal Plain, Geraldton Sandplains) |
| Adult size | Trunk to 3 m (variable — often trunkless); up to 105 cm diameter; fronds to 2.7–3 m |
| Hardiness | −2 to −4 °C (28 to 25 °F) / USDA zones 9b–11 |
| IUCN | Least Concern (LC) |
| CITES | Appendix II (all cycads) |
| Cultivation difficulty | 2/5 |
Taxonomy and Nomenclature
Macrozamia fraseri was described by Friedrich Anton Wilhelm Miquel in 1842 in his Monographia Cycadearum (p. 37). It is the first Macrozamia to be named from Western Australia — a distinction often overlooked because of the long period during which it was submerged under M. riedlei.
Etymology: the specific epithet honours Charles Fraser (1788–1831), Colonial Botanist of New South Wales, who accompanied Captain James Stirling’s expedition up the Swan River in 1827 to assess the region’s suitability for colonial settlement. Fraser observed the cycads of the Perth area and his collections informed the early taxonomy. Note: a separate source (Friends of Queens Park Bushland) attributes the epithet to the Western Australian surveyor and pastoralist Charles Fitzgerald Fraser (1883–1951), collector of the type specimen — the confusion reflects the long entanglement of this species’ history.
The confusion with Macrozamia riedlei: in the 1950s, Charles Gardner and Bennett extended the name M. riedlei to cover all three southwestern Australian Macrozamia species, effectively sinking M. fraseri and M. dyeri into synonymy. This persisted for decades. It was not until Ken Hill’s revision at the end of the 20th century that M. fraseri was restored as a distinct species. Barrett and Tay (2005, 2016) confirmed that the zamia in Kings Park and Bold Park — Perth’s most visited bushland reserves — is M. fraseri, not M. riedlei as previously recorded. Before Miquel’s work, early recorders (Robert Brown 1802, Stirling 1827, Moore 1842) had referred to the Perth Macrozamia as “Zamia spiralis” — after its eastern relative.
Macrozamia fraseri is placed in section Macrozamia — the larger, amphistomatic-leaved group within the genus.
Common names: Sandplain Zamia; Zamia Palm (the general Western Australian term). Noongar: djiridji.
Morphological Description
Macrozamia fraseri is a medium to large, dioecious, evergreen cycad — the most robust of the three Western Australian species.
Trunk: highly variable — from low-growing or trunkless to a stout arborescent form up to 3 m tall and 40–105 cm in diameter. Old trunks often show fire scars. The crown is densely woolly — a distinctive character visible in the field (the mass of tawny to brown wool surrounding the emerging fronds is denser than in M. riedlei).
Leaves: grey-green, semi-glossy, rigid, up to 2.7–3 m long. The key diagnostic character: the leaves are distinctly keeled (V-shaped in cross-section), with opposing leaflets inserted at 90–150° on the rachis. This is the single most reliable character separating M. fraseri (keeled) from M. riedlei (flat or only slightly keeled).
Leaflets: narrow to medium width, dull. The leaflets arise from the rachis in a pronounced V pattern, creating the keeled leaf profile.
Cones: the largest of any Western Australian Macrozamia.
- Male cones: produced in clusters. Fertile September–October.
- Female cones: large, broad, pineapple-like, up to 50 cm long, containing up to 160 seeds. Heavily spined.
Seeds: 3–5 cm long, 2–3 cm wide, ovoid. Sarcotesta bright red. Highly toxic.
Similar Species and Common Confusions
| Character | Macrozamia fraseri | Macrozamia riedlei | Macrozamia dyeri |
|---|---|---|---|
| Leaf cross-section | Distinctly keeled (V-shaped) | Flat to slightly keeled | Keeled |
| Crown | Densely woolly | Less woolly | Variable |
| Cone size | Largest (to 50 cm, 160 seeds) | Smaller | Variable |
| Trunk | Variable — to 3 m, up to 105 cm diameter | Usually trunkless | Short to medium |
| Habit | Robust, often arborescent | Smaller, less robust | Variable |
| Habitat | Sand heath, no jarrah | Jarrah forest understorey | South coast / Esperance |
| Distribution | Swan Coastal Plain, Geraldton Sandplains | Jarrah forest (Dwellingup–Albany) | South coast / Esperance |
The critical point: M. fraseri and M. riedlei are largely allopatric (non-overlapping), though their ranges touch in places. M. fraseri grows on the coastal plain on deep sand, in heath without jarrah; M. riedlei grows in the jarrah forest on lateritic soils. If you are standing in Kings Park, Bold Park, or suburban Perth — it is M. fraseri. If you are in the Perth Hills jarrah forest — it is M. riedlei. The leaf keel confirms: distinctly V-shaped = M. fraseri; flat = M. riedlei.
Distribution and Natural Habitat
Macrozamia fraseri is endemic to southwestern Western Australia, restricted largely to the sandy soils of the Swan Coastal Plain and the Geraldton Sandplains. The distribution extends from Mandurah (south of Perth) through the Perth metropolitan area northward to Enneabba and as far as Jurien Bay. It is locally abundant but sparsely distributed.
The species grows in low heath, shrubland, and sub-heath on deep sand — habitats that notably lack jarrah (Eucalyptus marginata). This is the key ecological separator from M. riedlei: jarrah present = M. riedlei territory; jarrah absent, deep sand = M. fraseri territory.
Prominent accessible populations exist in Kings Park and Bold Park (both within the Perth metropolitan area), making this one of the most easily observed cycads in any major Australian city.
Climate in the native range:
| Parameter | Perth / Swan Coastal Plain |
|---|---|
| Mean annual temperature | 17–19 °C |
| Mean winter minimum | 8–10 °C |
| Historical absolute minimum | −1 to −3 °C (frost occasional, inland locations colder) |
| Mean summer maximum | 30–35 °C |
| Annual rainfall | 650–750 mm (strictly winter-dominant, Mediterranean) |
| Köppen classification | Csa (hot-summer Mediterranean) |
This is a textbook Mediterranean climate — hot dry summers, cool wet winters — one of the closest analogues to southern France, coastal Liguria, or the Côte d’Azur in the cycad world. The strictly winter rainfall pattern distinguishes the M. fraseri climate from the summer-dominant rainfall experienced by the eastern Australian Macrozamia species.
Conservation
Macrozamia fraseri is listed as Least Concern (LC). The species is locally abundant on the Swan Coastal Plain and occurs in several well-protected reserves (Kings Park, Bold Park, and numerous other urban and peri-urban bushland remnants). However, the ongoing urban expansion of Perth and associated land clearing on the coastal plain is fragmenting habitat. The decline of emu populations in the Perth region may also be reducing long-distance seed dispersal capacity.
Aboriginal Ethnobotany
Macrozamia fraseri — not M. riedlei — is the cycad that sustained the Noongar communities of the Perth and Swan River area. The earliest European accounts of zamia food processing in Western Australia refer specifically to the coastal plain species — the plant growing where the Noongar people lived.
The mordak process: the ripe seeds (by-yu in Noongar) are harvested in March, then buried in specially dug pits (mordak) lined with rushes, covered with sand, and left to ferment for approximately one lunar month (28 days). After this period, the detoxified seeds are ready for roasting and consumption. Grey’s 1841 account describes the women collecting the seeds, soaking them in shallow pools for several days, then digging the mordak pits “about the depth that a person’s arms can reach.” Barker’s 1830 account — from his indigenous informant Maragnan — is the earliest recorded description: “the fruit of the low fan leaved palm which after gathering they bury in the earth for about a moon when it becomes fine eating.”
This is the same mordak technique described in the M. riedlei article — but the Perth-area Noongar communities were processing M. fraseri seeds, not M. riedlei. The misattribution to M. riedlei in the literature is a direct consequence of the taxonomic confusion between the two species.
Cultivation
| Hardiness | −2 to −4 °C (28 to 25 °F) / USDA zones 9b–11 |
| Light | Full sun (strongly preferred) |
| Soil | Well-drained; deep sand preferred |
| Watering | Drought-tolerant; adapted to dry summers |
| Adult size | Variable — trunkless to 3 m trunk; fronds to 2.7–3 m |
| Growth rate | Slow |
| Difficulty | 2/5 |
Macrozamia fraseri is very uncommon in cultivation outside Western Australia — PACSOA explicitly notes this. Within WA, it is a familiar plant in parks and gardens. It is easy to grow given appropriate conditions.
Light: full sun is strongly preferred. This is a plant of open heath and shrubland, not forest understorey. In shaded positions, growth is weaker and the crown less densely formed.
Soil: deep, well-drained sand is ideal — matching the native habitat. The species is likely intolerant of heavy or poorly drained soils.
Watering: adapted to a strictly Mediterranean rainfall pattern — winter-wet, summer-dry. In cultivation, water during winter and spring; reduce or cease in summer. This inverted watering regime (compared to the summer-rainfall eastern Australian species) is important for long-term health.
Cold hardiness: the Perth climate experiences occasional frost (−1 to −3 °C), and the species is reasonably frost-tolerant. USDA zone 9b minimum for permanent outdoor planting, with the standard half-zone safety margin. In European Mediterranean climates (Côte d’Azur, coastal Var, Liguria), this species is one of the best-adapted Macrozamia species for Mediterranean gardens — not because it is the hardiest (it is not), but because its climate of origin is the closest match to the European Mediterranean. The winter-rainfall pattern, the sandy soils, and the heath vegetation of the Swan Coastal Plain are remarkably similar to parts of the Maures massif, the Esterel, and coastal Liguria. In sheltered positions with excellent drainage, M. fraseri should feel at home. Winter protection (fleece, mulch) is advisable in zone 9b during abnormally cold events.
Container culture: well suited, particularly for growers outside WA who want to control the watering regime (dry summer, wet winter) and protect from cold.
Buying Advice
Availability: Macrozamia fraseri is very uncommon in the international trade. Most plants sold as “Western Australian zamia” outside WA are M. riedlei, not M. fraseri. Seeds may be obtainable from WA specialist nurseries or cycad society seed banks. The taxonomic confusion means that accurate labelling is essential — verify the keeled leaf character.
Propagation
Seed: the standard method. Clean the bright red sarcotesta (gloves — toxic), sow in deep, sandy, well-drained mix at 25–30 °C. Germination is cryptocotylar. No pretreatment required. Growth is slow.
Pests and Diseases
Root rot: the primary risk — the species is adapted to deep, free-draining sand and will not tolerate heavy or waterlogged soils.
Scale insects and mealybugs: occasional. Manageable with horticultural oil.
Fire: the species is fire-adapted; the thick trunk survives bushfires and the crown resprouts. In cultivation, fire is not a concern, but the fire scars on old trunks add character.
Toxicity: all parts are highly toxic (cycasin, macrozamin). The same warnings as for all Macrozamia species. The bright red sarcotesta is attractive but dangerous. Toxic to dogs, cats, livestock, and humans.
Landscape Use
Macrozamia fraseri is the Macrozamia for Mediterranean gardens. Its native climate — hot dry summers, cool wet winters, deep sand, open heath — is the closest match to the southern European Mediterranean among all Australian cycads. In European gardens with sandy or gravelly soils, full sun, and winter rainfall, this species can be grown in conditions that closely replicate its home. The robust arborescent habit (trunk to 3 m in old specimens), the grey-green keeled fronds to 3 m long, and the densely woolly crown give it a distinctive, sculptural presence. Use it as a specimen in a Mediterranean heath garden, alongside Xanthorrhoea grass trees, Banksia, and other southwestern Australian plants. In Perth, it is already a familiar element of urban parks and gardens — Kings Park and Bold Park demonstrate its landscape potential in a Mediterranean climate. The large pineapple-like cones (up to 50 cm) are spectacular when produced. For European growers seeking a Macrozamia that is ecologically and climatically at home in their garden — not merely tolerant of it — M. fraseri is the species to seek.
Frequently Asked Questions
How do I tell Macrozamia fraseri from Macrozamia riedlei?
Check the leaf cross-section: M. fraseri has distinctly keeled (V-shaped) leaves; M. riedlei has flat or only slightly keeled leaves. The crown of M. fraseri is densely woolly; the cones are larger. Habitat is also diagnostic: M. fraseri grows on deep sand in heath without jarrah (coastal plain); M. riedlei grows in jarrah forest on lateritic soils (Perth Hills and southwest).
Is this the zamia in Kings Park?
Yes. Barrett and Tay (2005, 2016) confirmed that the zamia in Kings Park and Bold Park is M. fraseri, not M. riedlei as previously recorded. The confusion persisted for decades because all WA Macrozamia were lumped under M. riedlei from the 1950s until Hill’s revision.
Why is it rare in cultivation outside Western Australia?
Partly because of the taxonomic confusion (plants sold as WA zamia are usually M. riedlei), and partly because the species has a very specific Mediterranean climate adaptation (winter rainfall, summer drought, deep sand) that limits its suitability in summer-rainfall climates. In European Mediterranean gardens, it should perform well — but awareness of its separate identity is recent.
Is it suitable for European Mediterranean climates?
Potentially the best-adapted Macrozamia for European Mediterranean gardens — its native climate (Perth: Csa, 650–750 mm winter rainfall, hot dry summers) is the closest match among all Macrozamia species to the Côte d’Azur, Liguria, or coastal Var. USDA zone 9b minimum, with winter protection in marginal areas.
Authority Websites and Databases
POWO — Plants of the World Online (Kew)
https://powo.science.kew.org/…
Accepted species. First published in Monogr. Cycad. 37 (1842).
FloraBase — Western Australian Herbarium
https://florabase.dbca.wa.gov.au/browse/profile/18119
Official WA Flora profile: tree or cycad, trunk variable, dull strongly keeled leaves, narrow to medium leaflets, large broad cones. Sand. Sub-heath (no jarrah). Bioregions: Geraldton Sandplains, Jarrah Forest, Swan Coastal Plain.
PACSOA — Palm and Cycad Societies of Australia
https://pacsoa.org.au/wiki/index.php/Macrozamia_fraseri
Distribution: Enneabba south to Perth. Locally abundant, sparsely distributed, in shrublands and heath on deep sand. Medium to large, robust arborescent or acaulescent cycad, trunk to 3 m, 40–70 cm diameter. Grey-green, semi-glossy leaves to 2.7 m, moderately keeled (90–150°). Densely woolly crowns, large cones. Very uncommon in cultivation. Mediterranean climate, 650–750 mm winter rainfall. Full sun, cold tolerant.
Anthropology from the Shed — Macrozamia: the fermented oil fruit
https://www.anthropologyfromtheshed.com/…
Detailed ethnobotanical account: M. fraseri as the first WA Macrozamia named (Miquel 1842), Charles Fraser etymology, mordak processing, seed cones up to 160 seeds, 3–5 cm × 2–3 cm. Barrett & Tay (2016): Kings Park and Bold Park are M. fraseri, not M. riedlei. Grey (1841), Barker (1830), Drummond (1862) accounts of Aboriginal seed processing.
Ockham’s Razor — What plant is that? Zamia
https://ockhamsrazor.wordpress.com/…
Practical guide to distinguishing the two Perth-area Macrozamia species: M. fraseri (keeled leaves, coastal plain) vs. M. riedlei (flat leaves, jarrah forest). “The keel of the leaf is the main identifying feature.”
Bibliography
Barrett, R. L., & Tay, E. P. (2016). Perth Plants: A Field Guide to the Bushland and Coastal Flora of Kings Park and Bold Park (2nd ed.). CSIRO Publishing.
Hill, K. D. (1998). Cycadophyta. Flora of Australia, 48, 597–661.
Jones, D. L. (2002). Cycads of the World (2nd ed.). New Holland Publishers, Sydney.
Miquel, F. A. W. (1842). Monographia Cycadearum. Utrecht. p. 37.
Whitelock, L. M. (2002). The Cycads. Timber Press, Portland.