Published in Memoirs of The Torrey Botanical Club, in 1890, in volume 1, issue 4, pages 141-185

Published in Memoirs of The Torrey Botanical Club, in 1890, in volume 2, issue 1, pages 1-26

Published in Memoirs of The Torrey Botanical Club, in 1890, in volume 2, issue 2, pages 27-56