Plant stems contain cellular tissue called collemchyma. Collelmchyma is what makes celery stalk fibers hard to chew. In Mint family plants, heavier concentrations of collenchyma build up at the stem corners, making the stems square. Verbena and Madder family plants also have square stems.
Plant stems contain cellular tissue called collemchyma. Collelmchyma is what makes celery stalk fibers hard to chew. In Mint family plants, heavier concentrations of collenchyma build up at the stem corners, making the stems square. Verbena and Madder family plants also have square stems.
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