The pod types, and what each one means
| Pod type | What you see | How it opens | Common trees |
|---|---|---|---|
| Legume | Long, flat, bean-like, often curved | Splits along two seams | Acacia, wattle, cassia, laburnum, carob |
| Capsule | Round, oval or cup-shaped, woody or papery | Splits by valves or pores | Eucalypt, gum, tea tree, bottlebrush |
| Spiny burr | A round case covered in sharp spines | Splits into sections | Sweet chestnut, datura, some wattle |
| Samara | A single seed with a papery wing | Does not open | Maple, ash, elm, tuliptree |
| Cone | Woody, layered scales | Scales separate | Pine, casuarina, banksia |
| Fleshy drupe | Soft or leathery, often colourful | Does not split | Walnut, pecan, mango, plum |
Wattles and acacias: the legume family
Most of the pods you find on the ground in Australia belong to the legume family. They are long, flat and bean-like, and they open along two seams when they dry, twisting as they do.
Within the family, the pod itself narrows things down. Acacia pods are usually narrow, straight or coiled, and often have a raised margin along the seam. Cassia pods are longer and more cylindrical. The pods of the pea-flowering wattles are short and plump.
Eucalypts: capsules, not pods
Eucalypts do not produce pods. What falls from a gum tree is a small woody capsule, usually bell-shaped or cup-shaped, with a rim where the lid once sat. On the tree it looks like a little wooden cup; on the ground it looks like a tiny bell.
The capsule is genuinely useful for identification because its size, shape and the depth of the rim differ between species. A common mistake is to assume every small woody cup is a gum — casuarina and banksia produce similar structures.
The spiny ones, and why they matter
A round, spiny burr on the ground is usually a sweet chestnut, which is edible, or a datura or wattle burr, which is not. The two look similar at a glance and the difference is worth knowing.
Sweet chestnut burrs are large, densely spined and contain two to three glossy brown nuts. The burrs of toxic species are usually smaller, less densely spined, and contain many small seeds rather than a few large nuts. When in doubt, do not handle the seeds and do not taste anything.
How to photograph a pod
- Lay the pod on a plain surface and photograph it from directly above, showing the full length.
- Add a coin or ruler for scale. Pod length is one of the strongest identifiers and it is impossible to judge from a close-up.
- Take a second photo of the pod on its edge, so the thickness and any wing are visible.
- If the pod is open, photograph it open. The way it splits is a family-level clue.
- If you can, include a leaf from the same tree in the frame. Pod plus leaf resolves almost every species that pods alone cannot.
A seed pod is often the only part of a tree you can reach. Pods drop on the footpath, sit in the gutter and collect on the driveway long after the leaves have gone, which makes them one of the most practical things to identify from.
The good news is that pods are highly structured. Their shape and the way they open are family-level features, so a single clear photo usually gets you a long way.
Frequently Asked Questions
A pod is a legume, which splits along two seams and is usually long and flat. A capsule is round or cup-shaped and splits by valves or pores. Eucalypts produce capsules; acacias produce pods.