There is a plant in Kirstenbosch Gardens that most visitors walk straight past. It looks, at first glance, like a large and rather serious fern. It doesn’t flower in any conventional sense. Nothing about it announces itself.
I think it is one of the most remarkable things in Cape Town — and one of the most completely overlooked.
Its name is Wood’s Cycad, Encephalartos woodii, and it holds a distinction that no other living plant on earth can claim: it is the last known individual of its species. Every Wood’s Cycad alive today is a clone of a single male plant found on a hillside in Zululand in 1895. There are no females. Botanists have searched the oNgoye Forest and every known cycad collection since 1895. None has ever been found. The species cannot reproduce. It is, in the precise botanical sense, extinct — and yet here it is, alive, producing cones each year with pollen that has nowhere to go.
My background is in genetics and plant pathology, and I came to guiding via a long detour through biology. When I first stood in front of the Kirstenbosch specimen and understood what I was looking at, I felt something close to vertigo. This is the terminal point of an evolutionary lineage that has been unbroken for 280 million years. It outlasted the dinosaurs. It is older than the Atlantic Ocean. And it is going to die without issue, because in 1895 a botanist found only one.
The Discovery
John Medley Wood, curator of the Durban Botanic Garden, found the plant in 1895 growing on a steep slope on the edge of the oNgoye Forest in KwaZulu-Natal. The original specimen was a cluster of four stems. Over the following two decades they were progressively removed for cultivation — offsets to Kew in 1899, more stems in 1903 and 1907. By 1916 the last trunk had been taken. Searches of the forest have continued ever since. No further specimens have been found.
The Kirstenbosch specimen arrived in 1916 from the Durban Botanic Garden. It has been growing here for more than a century. The botanists who collected those stems believed they were saving the species. They were the last people to see it alive in the wild.
Every Wood’s Cycad alive today descends from a single male plant. All ~500 known specimens are genetically identical clones.
What the Genetics Actually Means
Cycads are dioecious — male and female on separate plants. Wood’s Cycad is male. It produces pollen but cannot self-fertilise, and without a female of the same species, the pollen is biologically useless. All approximately 500 specimens in gardens worldwide share identical nuclear DNA. When the last of them dies, the genome of Encephalartos woodii ceases to exist.
There is an attempt underway to prevent this. Scientists are crossing Wood’s Cycad pollen with the related Encephalartos natalensis and back-crossing successive generations toward an approximate female E. woodii. The logic is sound in principle — but here is the complication anyone with a genetics background will recognise immediately. Chloroplast DNA is inherited exclusively through the female line. A back-crossed hybrid will always carry E. natalensis chloroplasts. A pure female E. woodii cannot be reconstructed. What can be built is a very close approximation. The original is gone.
Finding it in Kirstenbosch
The specimen grows in the Cycad Amphitheatre, a dedicated area of the garden with one of the world’s most significant cycad collections. It is labelled. Most visitors read the label and move on.
I ask guests to stop longer. To look at the cone — the male strobilus that will never deliver its pollen to a receptive female. To consider that the lineage behind this plant is not measured in centuries but in geological epochs: when the ancestors of cycads first appeared on earth, the continents had not yet separated into the shapes we recognise today. The cycad does not know any of this. It does what it has done for millions of years: it grows, produces cones, and waits. The waiting is the part that stays with me.
The act of conservation in 1916 was also the act of extinction. The botanists who saved it were the last people to see it wild.
Why This Plant Matters
Wood’s Cycad asks a different kind of question from the fynbos that surrounds it — not about diversity and abundance but about loss and time. It is the extreme case: the point to which a line of pressure can lead. The Cape Floristic Region is a biodiversity hotspot precisely because it is threatened, and this plant is a memento mori for that whole conversation.
But it is also, simply, a very old and very beautiful plant, growing in a garden in Newlands in the morning sun. Go and stand in front of it. Read the label. Let the number — 280 million years — sit with you for a moment.
Then, if you want to understand why that number matters, come and walk on the mountain above it.