Published in Journal of the Arnold Arboretum, in 1988, in volume 69, pages 1-23

Published in Journal of the Arnold Arboretum, in 1988, in volume 69, pages 65-71

Published in Journal of the Arnold Arboretum, in 1988, in volume 69, pages 85-166

Published in Journal of the Arnold Arboretum, in 1988, in volume 69, pages 193-212

Published in Journal of the Arnold Arboretum, in 1988, in volume 69, pages 213-237

Published in Journal of the Arnold Arboretum, in 1988, in volume 69, pages 239-273

Published in Journal of The Arnold Arboretum, in 1988, in volume 69, issue 2, pages 167-192