Tephrosia apollinea Seeds | Apollinea Tephrosia
LATIN NAME: Tephrosia apollinea
COMMON NAME: Apollinea Tephrosia
Plant Profile
Apollinea tephrosia is a low, silvery shrub of hot wadis and stony desert margins, usually under a metre high but spreading twice that wide on stems that arch out and then turn up at the tips. The leaves are pinnate with five to nine narrow leaflets, densely covered in silky white hairs, so the whole plant looks frosted even in full sun and stays cool to the touch. Pea flowers in pink, mauve or pale purple appear in short terminal racemes through the warm months, followed by small, straight, downy pods. It ranges from the Nile valley and the Horn of Africa across Arabia and southern Iran to Pakistan and north-west India, and it is one of the first shrubs to colonise gravel after rain. The silvery foliage is the reason it survives: the hairs reflect light and trap a layer of still, humid air against the leaf.
Science & Biotechnology
Tephrosia is a genus of rotenoid factories, and T. apollinea is no exception. The leaves and roots carry rotenone along with related compounds such as tephrosin and deguelin, all of which block electron transport at complex I of the mitochondrial respiratory chain. That is a brutally effective insecticide and a reliable fish poison, which is how the genus has been used for centuries from Africa to Southeast Asia — the powdered leaf thrown into a pool stuns fish so they can be gathered, and the same powder sprayed on crops kills caterpillars and aphids. Rotenone degrades quickly in sunlight and water, which is why it was once promoted as a soft option, but it is not selective: it is toxic to fish, to aquatic invertebrates and to beneficial insects, and epidemiological work has repeatedly raised questions about a link with Parkinson’s disease in exposed workers.
Uses & Benefits
In the garden this is a plant for a dry, hot, exposed slope where the silver foliage can be seen against gravel or stone, and where its long flowering season and its value to bees justify the space. It is a legume, so it does nodulate and fix nitrogen, and it has been used as a green manure and a cover crop in dryland trials, though its toxicity limits its value as fodder. The insecticidal use is real but should not be improvised: a home-made leaf infusion is a crude, variable and genuinely hazardous preparation, and it must never be poured into a pond or a waterway. In its native range it is one of the shrubs that carries grazing animals through the weeks after rain, though it is never a preferred forage.
Growing from Seed
Treat the seed as hard-coated: nick the testa with a file or soak in water at 80 °C for a few minutes, then leave in tepid water overnight. Sow on a gritty mix, cover by the seed’s own depth, and keep at 25 to 30 °C — this is a plant that wants warmth to move. Germination is usually quick and uneven, and a few seeds will always wait. Grow the seedlings in full sun and lean, alkaline-leaning compost, and water sparingly from the start, because damping-off is the main risk. Plant out after the last frost; in a cool climate the plant is best in a large pot under glass, where it can be kept dry through winter. Prune lightly after flowering to keep the shrub dense rather than leggy.
Our Take
Grow it for the silver foliage and the bees, and handle the chemistry with the respect a rotenone-bearing plant deserves.
Related Reading
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