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