Published in Fieldiana: Botany, New Series, in 1980, in volume 2, pages 1-141
Created: 2022-12-23, modified: 2022-12-23![](https://www.biodiversitylibrary.org/pagethumb/634447,60,60)
Published in Rhodora, in 1970, in volume 72, issue 789, pages 81-93
Created: 2016-07-19, modified: 2016-07-19![](https://www.biodiversitylibrary.org/pagethumb/7465916,60,60)
Published in Botanical Museum Leaflets, Harvard University, in 1969, in volume 22, pages 265-271
Created: 2016-02-07, modified: 2016-07-26![](https://www.biodiversitylibrary.org/pagethumb/7468856,60,60)
Published in Botanical Museum Leaflets, Harvard University, in 1983, in volume 29, issue 1, pages 1-25
Created: 2016-02-07, modified: 2016-07-26![](https://www.biodiversitylibrary.org/pagethumb/11157532,60,60)
Published in Journal of the Arnold Arboretum, in 1969, in volume 50, pages 180-196
Created: 2011-01-26, modified: 2023-02-16![](https://www.biodiversitylibrary.org/pagethumb/27999259,60,60)
Published in Annals of the Missouri Botanical Garden, in 1985, in volume 72, pages 878-880
Created: 2010-01-08, modified: 2015-12-16