An Introduction to Botany, Volume 2 |
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action anthers apex appears applied aril axis bark base become body branches called calyx carbonic acid cause cells cellular tissue closed colour common considered consists containing continued cotyledons covered direction distinct divided doubt effect embryo existence experiments external extremity fact fleshy flowers fluid formed fruit germination grains green growing hairs inches increase integument kind layers leaf leaves less light male manner mass matter means membrane motion nature nearly nucleus observed occurs opening opinion opposite organs origin ovule oxygen pass period petals placenta plants pollen portion present produced proportion quantity radicle remains remarkable resembling roots round seed seems seen separated side similar sometimes species spiral spores stamens stem stigma structure substance supposed surface takes place term tion tissue tree true tube usually vegetable vessels whole wood young