按色、类、型、组和品种五个等级组成的牡丹品种分类系统，“色型兼备、科学实用”，有推广价值。
Tree peony cultivars may be classified scientifically by a new system composed of five classes: color, type, form, group and cultivar.
比较不同的系统聚类方法，类平均法能较好适合辣椒品种的数量分类。
Compared with other systematic clustering method, UPGMA would be better for the numerical taxonomy of the capsicum varieties.
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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