The following is a list of the collections made by Graham Williamson in species name order. The records are of species which occur in Zambia (either as a native/naturalised species or as a cultivated species).
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| No | Species | Record date | Recorder(s) | Coll. | Det. | Conf. | Herbaria | Habitat | Location | Loc code | Outing code | Planted code | Country | QDS | Grid ref. | FZ Div | Alt. (m) | Notes | Lat | Long | Loc Acc Code |
| 84427 | Ascolepis pseudopeteri | 24 Dec 1969 | BK Simon G Williamson |
BK Simon G Williamson 1991 | SRGH K P |
Mwinilunga District | 0 | Zambia | W | 0 | K,Isotype of Ascolepis pseudopeteri,Goetgh. [family CYPERACEAE] (stored under name); Verified by Goetghebeur, P., | 0 | |||||||||
| 81979 | Disa aequiloba | Dec 1967 | G Williamson |
G Williamson 641 | Dambo | Serenje Dambo | 0 | Zambia | 1330B2 | C | 0 | 5 | |||||||||
| 81984 | Disa nyikensis | Dec 1966 | G Williamson |
G Williamson 223 | Nyika Plateau, Isoka District | 101 | 0 | Zambia | 1033D1 | N | 0 | 5 | |||||||||
| 81985 | Disa nyikensis | Dec 1971 | G Williamson |
G Williamson 2097 | Nyika Plateau | 101 | 0 | Zambia | 1033D1 | N | 0 | 5 |