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acid action anther apex appears applied arranged axis bark base bears become body botanists branches called calyx carbonic acid cause cells cellular tissue centre character cloth colour common consequence considered consists containing corolla covered described developement direction distinct divided Edition effect embryo examined exist experiments extremity fact fibres figure flowers fluid fruit grains green growing hairs History important instance kind known leaf leaves less light manner margin mass matter means membrane minute nature observed opposite organs origin ovule oxygen petals petiole placenta plants Plate pollen portion produced quantity remarked roots round seeds seems seen separate side sometimes species spiral stamens stem stigma structure substance supposed surface takes place term terminating thing tissue tree tubes usually vegetable veins vessels whole wood woody young