The following is a list of the collections made by Köhler in species name order. The records are of species which occur in Democratic Republic of Congo (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 |
| 95076 | Boerhavia diffusa | 1 Nov 1983 | JWH Giess O Köhler |
O Köhler 16023 | M Struwig | WIND |
Okavango, Rundu District: Andara. | 0 | Namibia (Caprivi Strip) | 1821A2 | 0 | -18.125000 | 21.375000 | 2 |