African DesertBotanical Atlas.

Marula occurs across a broad belt of sub-Saharan Africa. In southern Africa it is associated with warm, frost-free woodland and bushveld, often on sandy or loamy soils.^[1][2]

The tree is deciduous: shedding leaves limits water loss through the cool, dry part of the year. Its range is wider than the Kalahari and should not be reduced to one desert pin.^[1][2]

SANBI documents extensive food, household and cultural uses of the fruit, bark, wood and kernels. A clinical paper also records traditional topical use of the kernel oil by Zulu people.^[1][3]

In the cited study sample, oleic acid made up about 69% of the fatty-acid profile. Composition varies with provenance, harvest and processing, so this is a research value rather than a universal specification.^[3]

A small study found moisturising, hydrating and occlusive effects after topical use, with no irritation observed in its test groups. Promising human evidence, but not proof of a medical outcome.^[3]

Baobab grows in hot, dry woodland across tropical Africa. Southern African records include Botswana, Namibia, Mozambique, Zimbabwe and the far north of South Africa.^[4]

Its thick, water-rich trunk and leafless dry-season phase are part of a survival strategy suited to low rainfall and intense heat.^[4]

SANBI records a long, varied relationship between people and baobab: fruit and leaves as food, bark fibre for practical use, and multiple preparations in traditional practice.^[4]

Baobab oil contains oleic, linoleic and palmitic acids. Their proportions vary by sample and extraction method; the cited study is a composition reference, not a specification for every baobab oil.^[5]

That fatty-acid mix makes baobab useful as an emollient in cosmetic formulas, helping reduce a dry, rough feel. Composition alone does not demonstrate clinical efficacy.^[5]

Citrullus lanatus has a complex domestication and naming history. Kalahari forms are associated with sandy, water-limited landscapes, but the species occurs far beyond the basin shown here.^[6][7]

As an annual trailing plant, it completes its life cycle when moisture is available and carries the next generation through dry periods in durable seeds.^[6]

Botanical sources record Kalahari watermelons as a source of water and food. Research from Namibia also describes longstanding use of the seeds and oil for food and cosmetic purposes.^[6][7]

Namibian seed-oil samples in the cited study contained roughly 53–57% linoleic acid, alongside oleic and palmitic acids and naturally occurring tocopherols.^[7]

The linoleic-rich profile helps explain its lighter feel and value in balanced oil blends. This is compositional evidence; the study did not test clinical skincare outcomes.^[7]

Ximenia americana is a widespread tropical and subtropical species of seasonally dry habitats. The map highlights a southern African window, not the plant’s full global distribution.^[8]

Its shrub-like form, thorny branches and ability to grow in dry woodland and bushland suit exposed, seasonal environments. It is resilient, but not exclusive to true desert.^[8]

A study from Angola reports local use of ximenia seed oil to soften and moisturise skin and to care for hair. That account is place-specific and should not be generalised to all communities.^[9]

The cited oil contained oleic acid plus unusual long-chain fatty acids, including ximenic and nervonic acids. This chemistry helps distinguish ximenia from more familiar seed oils.^[9]

The study found effects in laboratory tests involving human keratinocytes. That supports further investigation, but it is not the same as evidence from a controlled human skincare trial.^[9]

Mongongo occurs in a southern-central African belt, especially on deep Kalahari sands in Angola, Namibia, Botswana, Zambia and Zimbabwe.^[11][12]

It is deciduous and rooted in deep, freely draining sand. Established trees tolerate seasonal drought, light frost and fire-prone woodland conditions.^[12]

The fruit and kernels are longstanding foods and livelihood resources. Their importance cannot be reduced to a cosmetic ingredient story.^[14][12]

Namibian samples contained roughly 24–36% alpha-eleostearic acid and 31–32% linoleic acid. This unusual conjugated-fatty-acid profile distinguishes mongongo from most familiar cosmetic oils.^[13]

The composition supports interest in mongongo as an emollient oil, but the cited work characterises chemistry rather than demonstrating a controlled human skincare outcome.^[13]

Hoodia gordonii is native from Namibia into the dry western interior of South Africa, with records associated with desert and dry shrubland.^[15][16]

Its fleshy, leafless stems store water and reduce leaf-surface water loss. The spines are modified structures, not evidence that Hoodia is a cactus.^[15][16]

SANBI records Hoodia knowledge among specific San communities. Commercial bioprospecting led to a landmark benefit-sharing agreement after early development failed to recognise those knowledge holders.^[17][15]

Research focused on steroidal glycosides and appetite rather than a seed oil or skincare function. Hoodia should not appear in an oil-composition comparison.^[18]

A controlled 15-day oral trial did not find a significant effect on energy intake or body weight and reported poorer tolerability and adverse changes in several measurements. This is not skincare evidence.^[18]

Devil’s Claw is a tuberous geophyte of seasonally dry southern Africa, especially sandy Kalahari environments in Namibia, Botswana and South Africa.^[19][20]

Above-ground growth disappears during dry periods while a primary storage tuber persists below ground. Secondary tubers hold water and the compounds sought in trade.^[20]

Southern African medicinal use predates the export trade. Modern harvesting and export are now important income sources in parts of Namibia, Botswana and South Africa.^[20][22]

The principal analytical markers are iridoid glycosides, especially harpagoside. This is root chemistry, not a fatty-acid seed-oil profile.^[21]

European assessment recognises traditional oral use while noting limitations in clinical evidence. It does not establish a modern topical skincare benefit.^[21]

Macadamia integrifolia is native to the rainforests of south-east Queensland and north-east New South Wales, Australia. In Africa it grows only where people planted it: orchards in Mpumalanga, KwaZulu-Natal and Limpopo make South Africa the world's leading producer, with further plantings in Malawi, Mozambique and Zimbabwe.^[26][27][28]

It is not a desert plant, and this Atlas does not pretend otherwise. It is here because it is the most abundant oil in both MARU body oils, and because where an ingredient is grown matters as much as where its species evolved. The shaded area marks orchard country, not a native range.^[26][27]

South Africa's planted area grew from around 6,750 hectares in 2001 to 81,302 hectares in 2024, and the country has led world production since the 2014/15 season. Orchards sit in the hot subtropical east; flowering begins in July and harvest runs from March into mid-year.^[27]

Across 15 cultivars in one study, oleic acid made up 61.7 to 66.5% of fatty acids and palmitoleic acid 13.2 to 17.6%. That palmitoleic share, an omega-7 fatty acid uncommon in plant oils, is what sets macadamia apart from the other oils in this Atlas.^[29]

A monounsaturated, low-linoleic profile helps explain macadamia oil's light slip and quick absorption in a blend. Popular claims that it is 'skin-identical' rest on the palmitoleic content alone, and the Atlas cites no human topical study for this oil.^[29]

Kew records Ricinus communis as native to north-east tropical Africa. It is now naturalised through the tropics and subtropics, and regional floras record it across southern Africa in disturbed ground, sandy riverbeds and riverine vegetation. Its African origin is real, but its presence here is as a naturalised plant rather than an original member of these landscapes.^[30][31][32]

In South Africa the castor-oil plant is listed as a Category 2 invasive species under the 2020 Alien and Invasive Species Lists, which means it may be grown only under permit. An origin on the continent does not make a plant welcome everywhere on it.^[34]

The seeds carry ricin and are dangerously toxic; the oil does not, because ricin does not partition into it. Reviews record traditional topical use of the oil across Africa for wounds, burns and skin complaints, alongside internal uses this Atlas does not endorse.^[36][37]

Ricinoleic acid, a hydroxy fatty acid almost unique to castor, makes up roughly 85 to 90% of the oil, with reported samples ranging from about 75 to 90% by origin. That single acid gives the oil its viscosity and its distinctive, cushioning feel.^[35][36]

The Cosmetic Ingredient Review found castor seed oil safe as used in cosmetics and not a significant skin irritant or sensitiser in human tests. In MARU oils it is a minor ingredient that adds body to a lighter blend; it is not the reason the blend works.^[37]