The following is a list of the collections made by Du Preez in species name order. The records are of species which occur in Angola (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 |
| 94797 | Barleria matopensis | 16 Mar 1976 | P Du Preez |
P Du Preez 00009 (17285) | I Darbyshire | WIND |
Growing in poorly drained gravelly clay soil in scrub/thicket. | Caprivi, Katima Mulilo District: Impalila Island, west of Aanloopbaan. | 208 | 0 | Namibia (Caprivi Strip) | 1725C3 | 930 | Shrub, 0.8 m high. Flower pink. | 5 |