Published in Journal of the Arnold Arboretum, in 1964, in volume 45, pages 1-35

Published in Journal of the Arnold Arboretum, in 1964, in volume 45, pages 206-234

Published in Journal of the Arnold Arboretum, in 1964, in volume 45, pages 235-250

Published in Journal of the Arnold Arboretum, in 1964, in volume 45, pages 260-273

Published in Journal of the Arnold Arboretum, in 1964, in volume 45, pages 274-278

Published in Journal of the Arnold Arboretum, in 1964, in volume 45, pages 285-301

Published in Journal of the Arnold Arboretum, in 1964, in volume 45, pages 346-357

Published in Journal of the Arnold Arboretum, in 1964, in volume 45, pages 401-438

Published in Journal of the Arnold Arboretum, in 1964, in volume 45, pages 439-463

Published in Journal of The Arnold Arboretum, in 1964, in volume 45, issue 1, pages 36-56

Published in Journal of The Arnold Arboretum, in 1964, in volume 45, issue 1, pages 57-100

Published in Journal of The Arnold Arboretum, in 1964, in volume 45, issue 1, pages 101-139

Published in Journal of The Arnold Arboretum, in 1964, in volume 45, issue 1, pages 140-157

Published in Journal of The Arnold Arboretum, in 1964, in volume 45, issue 1, pages 158-159

Published in J.Arnold Arbor., in 1964, in volume 45, issue 2, pages 161-205

Published in Journal of The Arnold Arboretum, in 1964, in volume 45, issue 2, pages 251-259

Published in Journal of The Arnold Arboretum, in 1964, in volume 45, issue 2, pages 279-283

Published in Journal of The Arnold Arboretum, in 1964, in volume 45, issue 3, pages 358-373

Published in Journal of The Arnold Arboretum, in 1964, in volume 45, issue 3, pages 374-389

Published in Journal of The Arnold Arboretum, in 1964, in volume 45, issue 4, pages 464-470

Published in Journal of The Arnold Arboretum, in 1964, in volume 45, issue 4, pages 474-489

Published in Journal of The Arnold Arboretum, in 1964, in volume 45, issue 4, pages 489-492