"' Parastichy, "'in phyllotaxy, is the ( invisible ) spiral line of the pattern of the areoles on some plants, such as cactuses and pinecones.
2.
Plant spirals can be seen in phyllotaxis, the arrangement of leaves on a stem, and in the arrangement ( parastichy ) of other parts as in snake fruit, as well as in the pattern of scales in pine cones, where multiple spirals run both clockwise and anticlockwise.
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