The Stebbins Medal was first awarded in 2003 in honour of the American botanist and geneticist George Ledyard Stebbins (1906–2000), one of the world's leading plant evolutionary biologists of the twentieth century. The medal is awarded biennially by IAPT for an outstanding paper in phylogenetic systematics and evolution of plants. The 2019 medal has been awarded to James Pease and colleagues for their paper published in 2016: James B. Pease, David C. Haak, Matthew W. Hahn & Leonie C. Moyle (2016): Phylogenomics reveals three sources of adaptive variation during a rapid radiation. PLoS Biol . 14(2): e1002379 (https://doi.org/10.1371/journal.pbio.1002379).

Pease & al. addressed the considerable controversy in the literature about the sources of variation in adaptive radiations. Based on transcriptome sequencing, their study identified and quantified the origins of adaptive variation in the evolutionary radiation of tomatoes in the Andes. Using a phylogenomic approach, the authors found evidence of three sources of variation (de novo mutation, ancestral variation, and introgression) and showed that each has contributed roughly equally to adaptive diversification. This study represents a highly creative use of phylogenomic data to address a critical question in evolutionary biology. It also presents one of the first studies to investigate the underlying genetic basis of adaptive evolutionary radiations using genomic data across a clade of species. Pease & al. very much followed Stebbins's philosophy in using a diverse range of empiricism and experimentation to address evolutionary questions.

The first author of the 2019 Stebbins Medal paper, James Pease, is an Assistant Professor of biology at Wake Forest University in North Carolina, U.S.A. His work investigates evolutionary processes of speciation, introgression and adaptation using integrative approaches. He has developed novel methods for evolutionary analysis that combine molecular evolution, gene expression, ecological data and phylogenomics. David Haak is an Associate Professor in Plant Pathology, Physiology, and Weed Science at Virginia Tech, Virginia, U.S.A.; Matthew Hahn is a Professor in the Biology and Computer Science Departments at Indiana University, Bloomington, U.S.A.; and Leonie Moyle is a Professor in the Biology Department at Indiana University, Bloomington, U.S.A.

James Pease with Leonie Moyle near Loja in southern Ecuador in 2014 doing fieldwork associated with their research on wild tomatoes. Photo: Bruce McClure.

Stebbins奖章于2003年首次颁发，以纪念美国植物学家和遗传学家George Ledyard Stebbins（1906–2000年），他是20世纪世界领先的植物进化生物学家之一。该奖章由IAPT每两年颁发一次，以表彰其在系统发育系统和植物进化方面的杰出论文。2019年的勋章已授予James Pease及其同事于2016年发表的论文：James B.Pease，David C.Haak，Matthew W.Hahn和Leonie C.Moyle（2016）：系统经济学揭示了人类在适应过程中的三种自适应变异来源快速辐射。PLoS生物学。14（2）：e1002379（https://doi.org/10.1371/journal.pbio.1002379）。

Pease等。解决了文献中关于自适应辐射变化源的大量争议。基于转录组测序，他们的研究确定并量化了安第斯山脉番茄进化辐射中适应性变异的起源。作者采用植物学方法，发现了三种变异源（从头突变，祖先变异和渗入）的证据，并表明每种都对适应性多样化做出了大致相同的贡献。这项研究代表了极富创造力的植物遗传学数据用途，以解决进化生物学中的一个关键问题。它还提供了使用跨物种进化论的基因组数据研究适应性进化辐射的潜在遗传基础的首批研究之一。Pease等。非常跟随斯特宾斯的

2019年斯特宾斯奖章论文的第一作者詹姆斯·皮斯（James Pease）是美国北卡罗莱纳州韦克森林大学的生物学助理教授，他的工作使用整合方法研究了物种形成，渗入和适应的进化过程。他开发了将分子进化，基因表达，生态数据和系统发育学相结合的进化分析新方法。David Haak是美国弗吉尼亚理工大学植物病理学，生理学和杂草科学副教授；Matthew Hahn是美国布卢明顿市印第安纳大学生物与计算机科学系的教授；Leonie Moyle是美国布卢明顿市印第安纳大学生物系教授

詹姆斯·皮斯（James Pease）和莱昂妮·莫伊尔（Leonie Moyle）于2014年在厄瓜多尔南部洛哈附近进行野外调查，研究野番茄。照片：布鲁斯·麦克卢尔（Bruce McClure）。