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