Grasses may be annual or perennial herbs,[8]:?10? generally with the following characteristics (the image gallery can be used for reference): The stems of grasses, called culms, are usually cylindrical (more rarely flattened, but not 3-angled) and are hollow, plugged at the nodes, where the leaves are attached.[8][9] Grass leaves are nearly always alternate and distichous (in one plane), and have parallel veins.[8]:?11? Each leaf is differentiated into a lower sheath hugging the stem and a-
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02/09/2024