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Microscope photography - Water mint flower cells
Acacia riceana seedling, via Flickr. Seedling of Acacia riceana germinating at 20°C at the Tasmanian Seed Conservation Centre. Most Acacia seed exhibit a Physical Dormancy and so the seed coats require scarification to allow germination to take place. Once the seed coat is broken water can enter the seed and germination is usually rapid.
Rattlebox seeds (Crotalaria sagittalis). These are considered invasive small trees. Not long lived, though beautiful flowers. They tend to propagate by following down streams of water and multiplying too much.