The following is a list of the collections made by Roesch in species name order. The records are of species which occur in Democratic Republic of the 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 |
| 93796 | Salvinia molesta | 18 Jan 1999 | I Roesch |
I Roesch 8 | ES Klaassen | WIND |
Caprivi Strip: Kwando river of north Kongola at Mazambala Island Lodge in main stream and backwater. | 0 | Namibia (Caprivi Strip) | 1723C4 | 0 | Hydrophyte; Notes: Perennial. Free floating fern. Leaves: green to yellow, oval in pairs, unwettable and velvety. Fruits: sterile fruiting bodies. Roots: feathery, hanging in water. Common name: kariba weed. Common. | -17.816670 | 23.333330 | 5 |