The following is a list of the collections made by Howell in species name order. The records are of species which occur in Zimbabwe (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 |
| 126442 (cultivated) | Burchellia bubalina (cultivated) | 15 Sep 1970 | MK Howell |
MK Howell in SRGH 217536 | SRGH |
Cultivated in garden. | Borrowdale, Harare. | 1 | 2 | Zimbabwe | C | 1470 | 0.000000 | 0.000000 | 0 |