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parastichy
parastichy (pəˈræstɪkɪ) n, pl -chies1. (Botany) a hypothetical spiral line connecting the bases of a series of leaves on a stem2. (Botany) an arrangement of leaves so connected[C19: from para-1 + Greek stikhia, from stikhos row, rank] paˈrastichous adj
Parastichy
Parastichy an oblique, spiral row of crowded leaves, scales, or flowers. Parastichy is observed in plants with short stems marked by whorled phyllotaxy: the cones of conifers and various inflorescences (for example, heads of Compositae) often have a series of crisscross parastichies curving in a clockwise or counterclockwise direction. |