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Cape Laburnum
Calpurnia aurea
SA tree no: 219
English: Cape Laburnum, Wild Laburnum, Common Calpurnia, Calpurnia, Natal Laburnum, Cape Gold, Showy Calpurnia, Golden Showers
Afrikaans: Kaapse Geelkeur, Geelkeurboom, Geelkeur, Natalse Geelkeur
Xhosa: inDloli, umSitshana
Zulu: umKhiphampethu, inSiphane-enkulu, umHlahlambedu, umLalandlovana
Historical scientific names: Sophora aurea, Calpurnia subdecandra, Calpurnia villosa
Calpurnia aurea, commonly known as Cape Laburnum or Kaapse Geelkeur, is a beautiful indigenous deciduous to semi-deciduous shrub or small tree. It is highly prized for its attractive, soft green, fern-like leaves and its spectacular displays of bright yellow, pea-like flowers that hang in graceful sprays, resembling the exotic European laburnum, hence its common name.
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Distinguishing features:
Produces abundant sprays of bright yellow, pea-like flowers that hang in pendulous clusters.
Flowers have a distinct 'keel' petal, typical of the pea family.
Leaves are compound, with many small, oval, soft green leaflets arranged oppositely along a central stalk.
Smooth, greyish bark.
Fruit is a distinctive flattened, papery, light brown pod.
Overall appearance:
The Cape Laburnum (Calpurnia aurea) is a charming deciduous to semi-deciduous shrub or small tree, often with an open, spreading habit. Its delicate, fern-like foliage provides a lovely backdrop for the star attraction: spectacular cascades of bright yellow, pea-like flowers that hang in loose sprays, creating a brilliant splash of colour and a delightful resemblance to its European namesake.
Height:
Typically grows 2 to 7 metres tall as a shrub or small tree, but can sometimes reach up to 10 metres in favourable conditions.
Width:
Can spread to a width of 1.5 to 4 metres, forming a rounded, bushy crown.
Leaves:
The leaves are alternate, compound (pinnate), with 7-15 pairs of opposite leaflets and a single terminal leaflet. The leaflets are oval to elliptical, typically 1-4 cm long and 0.5-1.5 cm wide, soft light green to mid-green on the upper surface, and slightly paler underneath. They are often finely hairy when young. The fern-like appearance adds to its delicate charm.
Flowers:
The flowers are bright yellow, pea-like (papilionaceous), and about 1.5-2.5 cm long. They have the characteristic five petals of the pea family: a large standard petal, two wing petals, and two lower petals fused to form a keel. The flowers are borne in showy, pendulous sprays (racemes) that are typically 10-25 cm long, produced profusely at the ends of branches and in leaf axils. They are mildly fragrant. Calpurnia aurea flowers are hermaphroditic, containing both male and female reproductive parts.
Flowering season:
It has an extended flowering season, primarily from spring to autumn (around September to May), with peak flowering often occurring in late spring to early summer.
Fruits:
The fruit is a distinctive, flattened, papery, light brown pod, typically 5-10 cm long and 1-2 cm wide, with a prominent papery wing along one side. Each pod contains several seeds and remains on the tree for some time after flowering.
Seeds:
The seeds are small, flattened, smooth, and kidney-shaped, typically 4-6 mm long. They are easily dispersed by wind from the papery pods.
Bark/Stems:
The bark is smooth and greyish-brown on young branches, becoming slightly fissured and darker with age. The young stems are green and can be slightly hairy.
Thorns:
None.
Wood:
The wood is pale, soft, and not typically used for large-scale timber.
Roots:
It has a moderately deep and fibrous root system, which contributes to its hardiness. As a legume, it forms nitrogen-fixing nodules on its roots, improving soil fertility.
Soil type:
Prefers well-drained, fertile soils with good organic content. It is adaptable to a range of soil types, including sandy and loamy soils, but dislikes heavy, waterlogged clay.
Aspect:
Thrives in full sun to partial shade. It prefers a sheltered position, especially from very strong winds, which can damage its delicate leaves and pendulous flower sprays. It is moderately drought-tolerant once established but performs best with regular watering. It is moderately frost-tolerant, particularly when mature, but young plants may need protection from severe frost.
Ediblity:
Not considered edible for humans.
Toxicity:
The plant is considered toxic, particularly the seeds, if ingested. It contains quinolizidine alkaloids, which can cause symptoms such as nausea, vomiting, diarrhoea, and in severe cases, more serious effects. It should not be ingested.
Uses:
An excellent ornamental plant for gardens, parks, and street planting, especially for its spectacular flowering display. It is ideal as a feature plant, informal hedge, screen, or planted in groups in mixed borders. Its delicate foliage adds a fine texture to the garden. It is a valuable plant for attracting pollinators and improving soil quality (nitrogen fixation). It also has traditional medicinal uses for certain ailments, but due to its toxicity, this should only be explored under expert guidance and never self-medicated.
Ecology:
The bright yellow, pea-like flowers are a magnet for a wide variety of insect pollinators, especially bees and butterflies, which are attracted to its colour and mild fragrance. As a legume, it enriches the soil with nitrogen through its root nodules. Its dense foliage provides shelter for birds and other small wildlife. The seeds are dispersed by wind.
Distribution and habitat:
Calpurnia aurea is widely distributed across the eastern parts of South Africa, including the Eastern Cape, KwaZulu-Natal, Mpumalanga, Limpopo, Free State, and Gauteng. It extends further north into Swaziland, Zimbabwe, and other tropical African countries. It typically grows in forest margins, open woodlands, savannas, grasslands, and along riverbanks, often found on rocky slopes or in disturbed areas.
Derivation of name:
The genus name Calpurnia honours the Roman statesman and orator Titus Calpurnius Siculus (1st century AD), who wrote eclogues (pastoral poems) that described trees and plants.
The species name aurea is Latin for "golden" or "golden yellow," aptly describing the brilliant colour of its flowers.
Common names like "Cape Laburnum" and "Wild Laburnum" refer to its resemblance to the European Laburnum species due to its pendulous yellow flower sprays, although they are not closely related. "Kaapse Geelkeur" means "Cape Yellow Keur," where 'keur' refers to certain pea-flowered plants.
Historical aspects:
As a widespread and beautiful indigenous tree, Calpurnia aurea has long been admired in South Africa. Its traditional uses highlight its role in indigenous knowledge systems. Its resemblance to the European Laburnum made it an early favourite in colonial gardens, showcasing the richness of local flora. Its ability to enrich the soil and attract pollinators has further increased its value in contemporary ecological landscaping.
Interesting facts:
This tree is like a living waterfall of sunshine! Its bright yellow flowers hang down in beautiful sprays, making it look incredibly cheerful.
It's often called "Cape Laburnum" because it looks so much like the fancy European Laburnum tree, but it's actually its very own cool South African plant!
The seeds are inside flat, papery pods that look a bit like crispy snacks – but remember, they are toxic, so no snacking!
As a legume, it's a super helper for the soil, actually putting nitrogen back into the ground, which makes other plants happy too.
Growing tips:
Propagation: Easily propagated from fresh seed, which should be scarified (lightly scratched) or soaked in hot water overnight to improve germination. Can also be grown from semi-hardwood cuttings.
Planting: Prefers full sun to partial shade. Plant in well-drained, fertile soil with good organic content.
Watering: Water regularly during dry periods, especially when young. Once established, it is moderately drought-tolerant but thrives with consistent moisture.
Frost Protection: Moderately frost-tolerant. Young plants may need protection from severe frost. It may be deciduous in colder areas.
Maintenance: Low maintenance. Prune after flowering (late autumn/winter) to maintain shape and encourage bushier growth. It tolerates heavy pruning if needed.
This plant is a fantastic alternative for:
Common name
Scientific Name
Plant type:
Plant type
Plant family:
Fabaceae (Latin plant name) - Order: Fabales