Some stems are hollow in the center. Plants of the family Poaceae, Cyperaceae, Lamiaceae etc. have hollow stems. The stems of Cyperaceae are three-cornered and those of Lamiaceae are four-cornered.
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Some stems are hollow in the center. Plants of the family Poaceae, Cyperaceae, Lamiaceae etc. have hollow stems. The stems of Cyperaceae are three-cornered and those of Lamiaceae are four-cornered.