长期以来对海棠的研究工作停留在经典植物分类学和园艺学研究方面，而对观赏海棠品种资源缺乏系统的调查和整理研究。
The study has stayed in the taxonomy and horticulture research since long times ago, but the ornamental crabapple resources lacks systematic collection and investigation.
长期以来对海棠的研究工作停留在经典植物分类学和园艺学研究方面，而对观赏海棠品种资源缺乏系统的调查和整理研究。
The study has stayed in the taxonomy and horticulture research since long times ago, but the ornamental crabapple resources lacks systematic collection and investigation.
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