The following is a list of the collections made by Watt in species name order. The records are of species which occur in Rwanda (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 |
| 95035 | Acacia sieberiana var. woodii | 27 Sep 1957 | JS Watt |
JS Watt 6 | PRE WIND |
Angola: Angola. Mucusso. Growing on the banks of the Okavango river. | 0 | Namibia (Caprivi Strip) | 1821A2 | 0 | -18.125000 | 21.375000 | 2 | ||||||||
| 95083 | Carissa spinarum | 1 Sep 1957 | JS Watt |
JS Watt 37 | JWH Giess | WIND |
Okavango, Rundu District: Okavango, probably Andara. | 0 | Namibia (Caprivi Strip) | 1821A2 | 0 | -18.125000 | 21.375000 | 2 | |||||||
| 93223 | Distephanus divaricatus | 1 Oct 1957 | JS Watt |
JS Watt 23 | WIND |
Caprivi: Western Caprivi Strip: Bwabwata. | 0 | Namibia (Caprivi Strip) | 1722D3 | 0 | Notes: Dune forest. English: 'Scotchman's rattle'; Bushman: ' 'nga 'ngingo ' | -17.875000 | 22.625000 | 5 | |||||||
| 93797 | Scadoxus multiflorus subsp. multiflorus | 30 Nov 1965 | JS Watt |
JS Watt 56 | DA Snijman | WIND |
Caprivi: About 7 miles west of Mukwangati - Omuramba. | 0 | Namibia (Caprivi Strip) | 1723C4 | 0 | 5 |