1. Department of Biology Duke University Box 90338 Durham North Carolina 27708 USA
2. University and Jepson Herbaria and Department of Integrative Biology University of California Berkeley California 94720 USA
3. Program in Genetics and Genomics Duke University Durham North Carolina 27708 USA
4. Department of Biology St. Mary’s College of Maryland 47645 College Drive St. Mary’s City Maryland 20686 USA