Published in Fieldiana: Botany, New Series, in 1980, in volume 2, pages 1-141

Created: 2022-12-23, modified: 2022-12-23

Published in Rhodora, in 1970, in volume 72, issue 789, pages 81-93

Created: 2016-07-19, modified: 2016-07-19

Published in Botanical Museum Leaflets, Harvard University, in 1969, in volume 22, pages 265-271

Created: 2016-02-07, modified: 2016-07-26

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

Published in Journal of the Arnold Arboretum, in 1969, in volume 50, pages 180-196

Created: 2011-01-26, modified: 2023-02-16

Published in Annals of the Missouri Botanical Garden, in 1985, in volume 72, pages 878-880

Created: 2010-01-08, modified: 2015-12-16