Adenanthera pavonina Seeds | Red Sandalwood
LATIN NAME: Adenanthera pavonina
COMMON NAME: Red Sandalwood, Peacock Flower Fence
Plant Profile
The bead is a botanical oddity for its consistency. Each seed is lens shaped, about the size of a small pea, hard, glassy and scarlet, with a fine dark line marking the hilum along one edge. Two seeds from opposite ends of a large tree differ by almost nothing in mass, which is exactly what a pre-metric trading world needed. In southern India and through the Malay world these beads were handled as counters and as a jeweller’s unit.
Under a hand lens the flowers explain the generic name, which joins the Greek words for gland and anther. Each anther carries a small deciduous gland at its tip, a detail easy to miss in a spike only a few millimetres wide. The flowers themselves are creamy white to pale yellow and packed into short axillary spikes, so the whole inflorescence reads as a bottlebrush of stamens rather than a display of petals, and bees work through it heavily.
The fruit is a flat legume up to about twenty centimetres long, and it opens with force. As the two valves dry they curl into tight spirals, flicking the seeds clear of the parent crown rather than dropping them at the trunk. A tree in full pod on a hot afternoon can be heard as a series of small dry clicks.
Like other mimosoid legumes, the red bead tree enters a root-nodule partnership with soil rhizobia and can add nitrogen to the ground beneath it, which is why it has been planted over worn pasture and along village lanes from Africa to the Pacific. That same vigour has costs. The tree seeds freely, sprouts in any disturbed ground and is now listed as naturalised and weedy in parts of the Caribbean, Hawaii and the islands of the Pacific, and as a declared invader in a few of them.
Science & Biotechnology
The scarlet coat is a protective package with an edge. It resists water for a long time, and the kernel inside carries a haemagglutinating lectin along with a trypsin inhibitor, the protein arsenal that makes raw seed uneatable and explains why the plant is grown for ornament and bead work rather than for the kitchen. Prolonged boiling destroys both proteins, which is the key to the one food use the species does have.
Uses & Benefits
The closest look-alike is Adenanthera microsperma, and the two have been muddled in herbaria for a century. As the epithet suggests, the eastern species carries distinctly smaller seeds, roughly half the diameter of the bead described above, and its leaflets are narrower and more crowded on the pinna. Plants sold in the tropics under the common name coralwood may belong to either species, so the seed itself is the quickest identification tool a grower has.
In parts of Indonesia and Malaysia the seeds are boiled thoroughly, then roasted and eaten as a snack, a practice that depends entirely on the cooking. Elsewhere the bead is culture rather than food: drilled and strung into necklaces and rosaries, polished by hand and traded as one of the brightest natural reds available. The seed oil is dominated by unsaturated fatty acids, and the pale brown timber is worked into light furniture and small carved goods.
The marketing name red sandalwood is a misnomer: the true red sandalwood is an unrelated tree, and this heartwood is neither as dense nor as fragrant.
Growing from Seed
Nothing will happen with a bead that has never been treated. File or nick the coat on the side away from the hilum, or pour near-boiling water over the seeds and let them stand in it as it cools to room temperature. Sow the softened seeds two centimetres deep in a freely draining mix of coir, grit and sieved compost, keep them warm and only just moist, and pot them on as soon as the second true leaf has opened. Trees need four to six metres of room and full sun.
Young plants will not take frost. Hold them at ten degrees Celsius or above in bright light, cut the watering back sharply while the light is poor, and move them out again once night temperatures have lifted. A slightly restricted root run suits the species and often brings it into flower while still small.
Our Take
This is the tree I hand to anyone who wants to understand seed structure in one object: hard coat, stored food, chemical defence, all visible in something small enough to lose in a pocket. Grow the small-seeded Adenanthera microsperma beside it and the difference in bead size is obvious in one flat of seedlings. For another legume grown entirely for its seed jewellery, compare the prayer bead vine, and if the red heartwood is what drew you, the dye-and-timber story of sappan wood is the closer match.
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