The evolutionary leap that allowed plants to conquer the land with seeds

Gardening · Published 3 October 2026 Swipe more like this →

In short: Seed plants, or spermatophytes, define the modern landscape, yet their origins remain a complex puzzle of ancient biology. By developing the ability to produce seeds, these plants moved beyond the limitations of ferns and mosses, eventually radiating into the diverse flowering and cone-bearing species we see today.

The transition to seed-bearing plants was not an overnight event but a gradual acquisition of traits. About 385 million years ago, during the middle Devonian, a precursor known as Runcaria emerged in what is now Belgium. While it possessed many characteristics of modern seed plants, it lacked a solid seed coat and a specialized system for guiding pollen. It was likely wind-pollinated, marking a critical step in the evolutionary sequence leading to the seed.

Following Runcaria, plants like Moresnetia and Spermasporites appeared with more condensed structures. By the Famennian stage of the Devonian, seed-bearing plants had diversified significantly, including groups like Elkinsia and Archaeosperma. A major genetic milestone occurred roughly 319 million years ago when a whole genome duplication event took place in the ancestor of all seed plants, providing the raw material for their subsequent success.

Today, spermatophytes are categorized into five extant divisions. Four of these—cycads, ginkgo, conifers, and gnetophytes—are gymnosperms, characterized by their naked seeds. The fifth division, the angiosperms or flowering plants, encloses its seeds within fruit. While these groups are distinct, their exact evolutionary relationships remain a subject of active scientific debate, with molecular studies often challenging older classifications based on physical traits.

The fossil record reveals that this group's dominance has shifted over eons. Seed ferns, such as the prominent Glossopteris of the ancient supercontinent Gondwana, once dominated the late Paleozoic. By the Triassic, their importance waned as modern gymnosperms rose to prominence. It was not until the end of the Cretaceous that angiosperms underwent their massive radiation, cementing their place as the most diverse group of land plants.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?

Related

• The ancient woody plants that bridged the gap between spores and modern seeds
• Seeds packaged plant embryos for a drier planet
• The evolutionary leap that allowed plants to conquer the dry earth
• Gymnosperm means 'naked seed', and they are Earth's most threatened plants
• Why the sudden rise of flowering plants remains a major scientific mystery
• The ancient, slow-growing saw palmetto is a survivor of the American coastal landscape
• The umbrella pine is a living fossil that once dominated ancient northern forests
• Shallots are not just small onions, but a unique, cluster-forming culinary powerhouse for gardeners.
• The pepper trees of South America are not actually related to black pepper at all.
• The lost 19th-century delicacy that was resurrected through modern genetic breeding
• The humble scallion is a global culinary chameleon with a surprisingly ancient Mediterranean namesake.
• The snow pea is a botanical misnomer that thrives in cool, nitrogen-rich soil

More in Plants · More in Gardening · Latest · A–Z · All topics