Dissertation Research: Systematic and Morphometric Studies of Holodiscus

在导师托马斯邓肯博士的指导下， 学生理查德·利斯将在墨西哥进行实地考察， 中美洲采集15-20个物种的样本 蔷薇科的一个属。这些植物的叶子将提供 大多数性状的关系进行分类学分析 在这些物种中。数据将使用图像进行累积 分析，一种新的计算机数据采集方法。叶 字符将补充额外的字符， 花和水果，没有经过彻底的调查 以前。花蕾和茎尖将被保存， 染色体分析这将是第一次研究这个 山地属利用各种线索的证据， 提供了一致的环境分类群，构建 可靠的识别关键的物种，并映射 植物的地理分布。

Under the supervision of faculty adviser Dr. Thomas Duncan, student Richard Lis will conduct field work in Mexico and Central America to acquire samples of the 15-20 species of the rosaceous genus Holodiscus. Leaves of these plants will supply a majority of characters for a taxonomic analysis of relationships among these species. The data will be accumulated using image analysis, a new computer method of data acquisition. Leaf characters will be supplemented with additional characters from flowers and fruits, which have not been thoroughly surveyed previously. Flower buds and shoot apices will be preserved for chromosome analyses. This will be the first study of this montane genus to utilize a variety of lines of evidence to provide consistent circumscriptions of the taxa, to construct reliable identification keys to the species, and to map the geographic distributions of the plants.