| Birth | 20 May 1908 | Spokane, Spokane, Washington, United States | | | |
| Residence | 1910 | Spokane, Spokane, Washington, United States | | | |
| Residence | 1920 | Turlock, Stanislaus, California, United States | | | |
| Occupation | Bet 1929 and 1993 | Botanist | | | |
| Residence | 1935 | Hawaii, United States | | | |
| Marriage | 26 Jun 1936 | Kaneohe, Honolulu, Hawaii, United States - Violet Mildred Oliveira | | | |
| Residence | 1 Apr 1940 | Arlington, Virginia, United States | | | |
| Residence | 1950 | Falls Church, Fairfax, Virginia, United States | | | |
| Occupation | 1966 - 1993 | Worked for the Smithsonian Institution (head of Botany department) - Washington, District of Columbia, United States | | | |
| Marriage | 13 Apr 1985 | Fairfax, Virginia, United States - Suzanne Ripley | | | |
| Residence | 1989 | Falls Church, Fairfax, Virginia, United States | | | |
| Residence | 1992 | Reston, Fairfax, Virginia, United States | | | |
| Death | 25 Sep 1993 | Falls Church, Fairfax, Virginia, United States | | | |
| Cremation | 27 Sep 1993 | Falls Church, Fairfax, Virginia, United States | | | |