Whorl a ring

wort an old English term for plant; also an intermediate liquid in beer making xenobiotics biomolecules from outside the plant, especially molecules that are potentially harmful xeromorphic a form adapted for dry conditions xerophytes plants adapted for growth in dry areas

zonation division into zones having different properties zoospore a swimming spore zygote the egg immediately after it has been fertilized; the one-cell stage of a new individual

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