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