Living cycads show a range of archaic features which suggest that they are primitive plants. They have a long fossil record, but this unfortunately consists largely of vegetative leaves. Very few reproductive organs a...Living cycads show a range of archaic features which suggest that they are primitive plants. They have a long fossil record, but this unfortunately consists largely of vegetative leaves. Very few reproductive organs are preserved as fossils. However,展开更多
文摘Living cycads show a range of archaic features which suggest that they are primitive plants. They have a long fossil record, but this unfortunately consists largely of vegetative leaves. Very few reproductive organs are preserved as fossils. However,
