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Variation of rhizomes score plots between the adjacent latitudes. (a) is mid-latitude and mid-high latitude and (b) is mid-high latitude and high- latitude (blue circles = mid-latitude area, 24.95–25.06° N, red circles = mid-high latitude area, 26.49–26.64° N, yellow circles = high latitude area, 27.34–28.52° N).
