Published in Contributions from the University of Michigan Herbarium, in 1975, in volume 11, issue 2, pages 25-40
Published in Contributions from the University of Michigan Herbarium, in 1975, in volume 11, issue 2, pages 41-50
Published in Contributions from the University of Michigan Herbarium, in 1975, in volume 11, issue 2, pages 51-55
Published in Contributions from the University of Michigan Herbarium, in 1975, in volume 11, issue 2, pages 57-63
Published in Contributions from the University of Michigan Herbarium, in 1975, in volume 11, issue 2, pages 65-68
Published in Contributions From The University of Michigan Herbarium, in 1975, in volume 11, issue 2, pages 89-93