1
Έκδοση: 1988
Superior document: Smithsonian contributions to botany Number 72
2
Έκδοση: 1989
Superior document: Smithsonian contributions to botany Number 69
3
Έκδοση: 1989
Superior document: Smithsonian contributions to botany Number 68
4
Έκδοση: 1985
Superior document: Smithsonian contributions to botany 59
5
Έκδοση: 1987
Superior document: Smithsonian contributions to botany Number 65