This paper deals with leaf, stem and root growth of ten kinds (including clones, varieties and species) of one year poplar seedlings grown from cuttings.
本文对十个杨树种类(其中有无性系、变种，和种)一年生插条苗的叶、茎和根的生长及相互关系进行了研究。
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The Pachyphytum are generally propagated by leafcuttings.