The following is a list of the collections made by Hornby 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 |
| 32027 | Duosperma quadrangulare | No date | RM Hornby |
RM Hornby 2733 | BR |
Zambezi Valley near Tete | 0 | Mozambique | T | 0 | 0.000000 | 0.000000 | 0 | ||||||||
| 21 | Ottelia ulvifolia subsp. ulvifolia | 4 Apr 1952 | RM Hornby |
RM Hornby 3296 | SRGH |
Poole Farm, Chegutu | 0 | Zimbabwe | 1830A2 | C | 1200 | 0.000000 | 0.000000 | 0 |