2026年4月7日 / Last updated : 2026年4月7日 桑子 研 Science

Not a Broadleaf Tree?! The Truth Behind Ginkgo’s Fan-Shaped Leaves—A Living Fossil Revealed (Plant Guide)

I am Ken Kuwako, your Science Trainer. Every day is an experiment!

Golden ginkgo trees are the crowning jewels of autumn streets. When we see those fan-shaped leaves fluttering down, most of us think, “What a beautiful broadleaf tree!” But if you crack open a textbook, you’ll find a surprising truth hidden beneath those yellow leaves. As it turns out, the ginkgo isn’t actually a “broadleaf” tree at all. In fact, it’s not even quite the same as “conifers” like pines or cedars. It is a true “lone wolf” of the plant kingdom.

Today, let’s dive into the mysterious identity of the ginkgo—a tree you likely see often but might not truly know—and unravel its epic story of evolution.

Conifer? Broadleaf? The Ginkgo’s Unique Place in the World

When you hear the word “conifer,” you probably picture trees with needle-like leaves, like pines or cedars. After all, the name literally refers to that shape. So, what about the ginkgo with its flat, wide leaves? It’s easy to assume it’s a broadleaf tree based on its appearance, but scientifically speaking, that’s incorrect. Furthermore, while it is a gymnosperm (like pines), strictly speaking, it isn’t a conifer either [Source: Wiki].

Tracing the “One and Only” Ginkgo via the Evolutionary Tree

From Wiki: Despite having characteristic broad leaves, it is not a broadleaf tree; while it is a gymnosperm, it is not a conifer.

Let’s look at the “phylogenetic tree,” which shows how plants are related. In the grand timeline of evolution, ginkgoes branched off into their own unique path long before the modern conifer group even appeared.

If you trace the lineage back, the ginkgo split from the cycad family and then forged a path unlike any other plant. Today, in the entire world, there is only one single species remaining in the class Ginkgoopsida, order Ginkgoales, family Ginkgoaceae, and genus Ginkgo: the ginkgo tree we see today. It is truly a miraculous survivor that escaped extinction.

Broadleaf Looks, Ancient Roots!

Because of the leaf’s broad shape, it’s hard not to group it with broadleaf trees. However, if you look closely at its structure, you’ll find a fascinating prehistoric feature.

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Most broadleaf trees have a “net-like” vein pattern. In contrast, ginkgo veins all stretch from the base to the tip, splitting into two in a pattern called “dichotomous venation.” This is an incredibly primitive trait and is one of the reasons the ginkgo is called a “living fossil”—it has barely changed its appearance for hundreds of millions of years.

Want to Know More? Fun Ginkgo Trivia

Here are a few “did-you-know” facts about ginkgoes that are perfect for sharing!

1. The Tree with “Swimming” Sperm
While most plants fertilize via pollen tubes, the ginkgo actually produces sperm that swims on its own! This major discovery was made in 1896 by a Japanese researcher named Sakugoro Hirase. There’s something quite romantic about the idea of a tree possessing “swimming sperm,” isn’t there?

2. The “Fireproof Tree” Protecting the City
Ginkgo trees contain a high amount of water and are known for being remarkably resistant to fire. Records from massive historic fires in the Edo period show that ginkgo trees acted as firebreaks, protecting buildings from the flames. The fact that the ginkgo is the official symbol of Tokyo is likely a tribute to its incredible strength and vitality.

Next time you look up at a ginkgo tree, remember that those fan-shaped leaves carry a grand history stretching back to the age of the dinosaurs.

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