Dissertation Research: Systematics and Evolution of Calandrinia Subgenus Hirsutae (Portulacaceae)

研究生唐娜·福特在彼得·瑞文博士的指导下，将对智利马齿马齿科马齿苋属约20种一年生植物进行分类研究。数据将从智利新的野外采集和植物标本采集中获得，并对形态、解剖学、染色体数目、花粉和类黄酮类化合物进行额外的温室和实验室研究。考虑到生物地理学、生态学和生殖生物学的作用，我们将研究这些植物种群内和种群之间性状变异的分布情况。用于得出进化模式的计算机程序将被用来确定物种关系，并测试关于物种形成模式和迁徙路线的假设。该项目将提供关于半干旱地区植物的系统学和种群生物学的宝贵知识，并为南美洲植物资源的生物调查提供有用的信息。

Graduate student Donna Ford, working under the supervision of Dr. Peter Raven, will conduct a taxonomic study of 20 or so species of annual plants of the genus Calandrinia of the purslane family Portulacaceae in Chile. Data will be obtained from new field collections made in Chile and from herbarium collections, with additional greenhouse and laboratory study of morphology, anatomy, chromosome numbers, pollen, and flavonoids. The distribution of character variation within and among populations of these plants will be examined, considering the roles of biogeography, ecology, and reproductive biology. Computer programs for deriving evolutionary patterns will be used to determine species relationships and to test hypotheses about modes of speciation and routes of migration. This project will provide valuable knowledge about the systematics and population biology of semi-arid zone plants and contribute information useful for the biotic inventory of South American plant resources.