Materia Aromatica

The Eucalyptus Library

One genus, four chemistries. Eucalyptus read by chemotype and origin.

See the oils ↓

Eucalyptus is sold as though it were one oil with one smell. The genus divides into chemistries that have little in common in a formula. Cineole, citronellal, citral and piperitone each lead a different oil in this library, and each is read on its own terms.

01 · The Genus

One genus, four chemistries

Eucalyptus belongs to the myrtle family, Myrtaceae, and is native almost entirely to Australia and its neighbouring islands. Commercial planting has carried the trees to southern Europe, Africa, South America and the Indian Ocean. Every oil here is distilled from the leaves, with twigs added in the case of dives.

Species is the first division. Chemistry is the second, and the more useful one at the blending bench, because closely related trees can give oils that behave quite differently on a blotter. The lemon-scented citriodora is now often placed in Corymbia, a segregate genus, though the trade still sells it as eucalyptus.

Oxide

Cineole type

Globulus, radiata and smithii. 1,8-cineole leads all three; what accompanies it sets them apart.

Aldehyde

Citronellal type

Citriodora. Sharp, green lemon, with very little cineole.

Citral

Lemon-ironbark type

Staigeriana. Limonene and citral, with geranyl esters adding a rosy depth.

Ketone

Peppermint type

Dives. Piperitone leads; minty, camphoraceous and assertive.

Side by side

6 oils at a glance

Oil Botanical name Origin Cultivation Main constituents From Availability
Eucalyptus Staigeriana (organic) Eucalyptus staigeriana Brazil Certified organic Limonene, Citral (Neral + Geranial), Terpinolene, Geranyl... $12.00 In stock
Eucalyptus Globulus (organic) Eucalyptus globulus Spain Wild-crafted organic 1,8-Cineol, alpha- & beta-Pinene, Limonene $10.00 In stock
Eucalyptus Smithii (organic) Eucalyptus smithii South Africa Certified organic 1,8-Cineol, alpha-Pinene, Aromadendrene, Eudesmol $13.00 In stock
Eucalyptus Radiata (organic) Eucalyptus radiata South Africa Wild-crafted organic 1,8-Cineol, Limonene, alpha-Terpineol, alpha-Pinene $12.00 Sold out
Eucalyptus Dives Eucalyptus dives South Africa Conventional Piperitone, alpha-Phellandrene, Paracymene, Terpinene-4-ol $15.00 Sold out
Eucalyptus Citriodora (organic) Eucalyptus citriodora Madagascar Certified organic Citronellal, Citronellol, Isopulegol, Neo Isopulegol, Cit... $17.00 Sold out

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02 · The Range

Six oils, four chemistries

No. 1370 · SpainEucalyptus Globulus (organic)Eucalyptus globulus · wild-crafted organic1,8-cineole by a wide margin, with alpha- and beta-pinene. The cineole reference. No. 1401 · South AfricaEucalyptus Radiata (organic)Eucalyptus radiata · wild-crafted organic1,8-cineole softened by limonene and alpha-terpineol. Sweeter than globulus. No. 1437 · South AfricaEucalyptus Smithii (organic)Eucalyptus smithii · certified organic1,8-cineole with aromadendrene and eudesmol. A dry, rounded drydown. No. 1396 · MadagascarEucalyptus Citriodora (organic)Eucalyptus citriodora · certified organicCitronellal-led, with citronellol and isopulegol. Sharp lemon, little cineole. No. 1430 · BrazilEucalyptus Staigeriana (organic)Eucalyptus staigeriana · certified organicLimonene and citral, with geranyl acetate and geraniol. Lemon over a floral depth. No. 1420 · South AfricaEucalyptus DivesEucalyptus dives · conventionalPiperitone with alpha-phellandrene and para-cymene. Minty and camphoraceous.

Beyond these six, a further reserve of rarer eucalyptus chemotypes and single origins is held at the distillery and drawn to order. Practitioners can request them through community@haroma.co.

03 · Side by Side

Three readings across the genus

Globulus, radiata and smithii, set on blotters in a row, isolate what travels with 1,8-cineole. Globulus is the sharpest and most single-minded. Radiata carries limonene and alpha-terpineol, and its opening is sweeter. Smithii sits between the two, its sesquiterpenes giving a softer close. Radiata and smithii both come from South African plantations and globulus from Spain, so between those two the differences belong to species rather than ground.

Citriodora beside staigeriana compares two lemon notes built from different molecules. The citronellal of citriodora reads sharp, green and slightly waxy. The limonene and citral of staigeriana read brighter and fruitier, and its geranyl esters lend a faint floral tone.

Dives beside globulus is the widest gap in the library. Both are camphoraceous at first contact. Piperitone then turns dives towards peppermint, and the clean oxide character of globulus never arrives.

04 · In Practice

Formats and handling

The cineole oils are top notes and evaporate quickly. They suit diffusion, bath preparations and massage blends, where they lift heavier woods and resins. Radiata and smithii are the choice where globulus would dominate a blend.

In natural perfumery the lemon-scented oils are the more useful pair. Citriodora gives a clean aldehydic lift to cologne-style accords. Staigeriana sits readily with lavender, geranium and bergamot. Both carry aldehydes that alter with age, so bottles are kept cool and closed. The citral fraction of staigeriana calls for conservative dilution in skin preparations.

Dives is the most assertive oil here. Ketone-led oils are used at low dilution in massage blends, and dives also serves well in household and room formulation. Across all four chemistries, rosemary, pine, cedarwood, lavender, lemon and tea tree are dependable partners.

For olfactory study the six oils read best in the order of the range above: the three cineole types first, then the two lemon oils, then dives. The blotters can be kept side by side through the drydown.

Essential oils are for aromatic and topical use. Dilute before applying to skin. Keep out of reach of children.