Published in Journal of The Arnold Arboretum, in 1927, in volume 8, issue 1, pages 24-55

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

Published in Journal of The Arnold Arboretum, in 1927, in volume 8, issue 2, pages 69-86

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