Published in Bulletin of Carnegie Museum of Natural History, in 1979, in volume 14, pages 1-68

Created: 2017-04-10, modified: 2017-04-10

Published in Journal of The Arnold Arboretum, in 1976, in volume 57, issue 3, pages 217-218

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

Published in Journal of The Arnold Arboretum, in 1976, in volume 57, issue 3, pages 219-249

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

Published in Madroño, in 1975, in volume 23, issue 4, pages 220-227

Created: 2016-02-15, modified: 2016-07-07

Published in Gayana Botanica, in 2001, in volume 58, pages 1-12

Created: 2014-01-14, modified: 2014-01-14