The following is a list of the collections made by Holmes 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 |
| 81977 | Disa aequiloba | 11 Jan 1961 | WD Holmes |
WD Holmes 289 | Kawambwa District; Mbereshi Dambo | 0 | Zambia | 0928D2 | N | 0 | 5 | ||||||||||
| 81978 | Disa aequiloba | 1 Nov 1961 | WD Holmes |
WD Holmes 311 | Zambezi (Balovale) District; Kucheka Valley | 0 | Zambia | 1322D4 | B | 0 | 5 | ||||||||||
| 80297 | Eriocoelum lawtonii | 5 May 1955 | WD Holmes |
WD Holmes Holmes 1166 | Kew Staff | K |
Mwinilunga | 0 | Zambia | W | 0 | 0.000000 | 0.000000 | 0 | |||||||
| 90749 | Macaranga schweinfurthii | 5 Sep 1955 | WD Holmes |
WD Holmes 1162 | K NDO |
Mwinilunga | 0 | Zambia | W | 0 | 0.000000 | 0.000000 | 0 |