Published in Bulletin of the Torrey Botanical Club, in 1906, in volume 33, pages 27-34

Published in Bulletin of the Torrey Botanical Club, in 1906, in volume 33, pages 403-438

Published in Bulletin of the Torrey Botanical Club, in 1906, in volume 33, pages 513-522

Published in Bulletin of the Torrey Botanical Club, in 1906, in volume 33, issue 4, pages 213-221