Records determined by Ian Riddell

Determinations: 65

The following is a list of the records determined by Ian Riddell in species name order.

Click on a column heading to sort the entries in that column

NoSpeciesRecord dateRecorder(s)Coll.Det.Conf.HerbariaHabitatLocationLoc code(s) Outing codePlanted code Country QDSGrid ref.FZ DivAlt. (m)NotesLatLongLoc Acc Code
116653Acmella radicans var. radicans20 May 2022IC Riddell
 IC Riddell BT Wursten Komani0Zimbabwe1730D2C1481

https://www.inaturalist.org/observations/117832075

-17.70063030.9861767
79521Acmella radicans var. radicans3 Jun 2017IC Riddell
 IC Riddell MA Hyde Newlands Vlei, Harare10Zimbabwe1731C3C1510

In extensive patches, up to 2.8 m tall

-17.80000031.0790007
107972Adansonia digitata8 Aug 2019IC Riddell
 IC Riddell Ndowoyo Communal Lands, Chipinge0Zimbabwe2032C2E486

iNaturalist record

-20.56518332.4827026
107973Adansonia digitata8 Jan 2018IC Riddell
 IC Riddell Sango, Save Valley Conservancy0Zimbabwe2032A1E500

iNaturalist record

-20.23915532.2028157
107974Adansonia digitata11 Aug 2014IC Riddell
 IC Riddell Matusadona National Park.1650Zimbabwe1628C4N524

iNaturalist record

-16.96785928.4720907
107975Adansonia digitata1 Sep 1980IC Riddell
 IC Riddell Chizarira National Park1610Zimbabwe1727D2N1042

iNaturalist record

-17.71451427.8700365
112958Afzelia quanzensis12 Jan 2018IC Riddell
 IC Riddell BT Wursten Sango, Save Valley Conservancy0Zimbabwe2032A1 S600

iNaturalist record

 6
112957Afzelia quanzensis8 Aug 2019IC Riddell
 IC Riddell BT Wursten Ndowoyo Communal Lands, Chipinge0Zimbabwe2032C2 E0

iNaturalist record

 5
112956Afzelia quanzensis11 Aug 2019IC Riddell
 IC Riddell MA Hyde C. 25 km Southwest of Mutare.0Zimbabwe1932B1 E865

iNaturalist record

 7
123986Agelanthus subulatus6 Feb 2020IC Riddell
 IC Riddell CCH Jongkind Mukuvisi Woodland, Harare.1,20Zimbabwe1731C3C1510

Parasitic on Pterocarpus rotundifolius subsp. rotundifolius. iNaturalist record

-17.83999031.0953406
119080Albizia amara subsp. sericocephala29 Jan 2023MA Hyde
IC Riddell
 IC Riddell On a termite moundMukuvisi Woodland1,20Zimbabwe1731C3C1484

On a large anthill.

-17.84375931.0846747
119084Albizia amara subsp. sericocephala29 Jan 2023MA Hyde
IC Riddell
 IC Riddell Sandy woodlandMukuvisi Woodland1,20Zimbabwe1731C3C1485

Five tall trees on the anthill.

-17.84455031.0842777
117589Albizia tanganyicensis25 Sep 2022IC Riddell
 IC Riddell Miombo woodland regrowth on ironstone hillSummit ridge, Tree Society Arboretum, Lake Chivero110Zimbabwe1730D4C1452

-17.88588430.7674445
102467Ansellia africana25 Jul 2018IC Riddell
 IC Riddell C Peter Monavale Vlei, Harare770Zimbabwe1731C3 C1460

ADU OrchidMap record

 6
119081Ansellia africana29 Jan 2023MA Hyde
IC Riddell
 MA Hyde IC Riddell On a tree trunkMukuvisi Woodland1,20Zimbabwe1731C3 C1485

 7
98724Brachystegia allenii20 Sep 2018IC Riddell
 IC Riddell BT Wursten Roadside in mixed miombo woodland. National Parks Office, Marongora.0Zimbabwe1629A1N833

-16.22330129.1614987
122769Cleome houtteana14 Nov 2019IC Riddell
 IC Riddell MA Hyde On the lake foreshore.Lake Chivero Recreational Park, Zimbabwe.110Zimbabwe1730D4C1368

iNat record. https://www.inaturalist.org/observations/191832143

-17.91505330.8435457
122770Cleome houtteana12 Nov 2023IC Riddell
 IC Riddell MA Hyde On the lake foreshore.Lake Chivero Recreational Park, Zimbabwe.110Zimbabwe1730D4C1369

iNat record. https://www.inaturalist.org/observations/191831877. Ian Riddell commented as follows: "The Cleome was on the foreshore so grassy/herby. I presume it has come down the Marimba from Harare and there are no nearby gardens. There were about 3 or so plants in the latest sighting; probably a few more than that in 2019 (record_id no. 122769). Both fairly clumped together".

-17.91494930.8400157
123444Combretum kirkii3 Nov 2023MA Hyde
M Coates Palgrave
C Sharp
IC Riddell
K van Laeren
J Van Bel
S Mulunjana
 IC Riddell In deciduous dry forestDande Safari Area0Zimbabwe1530C4N441

Massive woody lianes with prominent bosses.

-15.91835830.3854797
117991Crinum crassicaule30 Oct 2022IC Riddell
 IC Riddell RH Archer Mukuvisi Woodland, Harare1,20Zimbabwe1731C3 C1489

In flower. https://www.inaturalist.org/observations/140955340

 7
118709Cucumis zeyheri28 Dec 2022IC Riddell
 IC Riddell MA Hyde Mukuvisi Woodlands, Harare1,20Zimbabwe1731C3C1503

https://www.inaturalist.org/observations/145251194

-17.84501631.0883527
101716 (cultivated)Cycas thouarsii (cultivated)10 Dec 2018IC Riddell
 IC Riddell Cultivated in gardenLeeds Close, Newlands, Harare12Zimbabwe1731C3C1508

-17.81162931.0808457
119075Cyperus laxus subsp. sylvestris29 Jan 2023MA Hyde
IC Riddell
 MA Hyde IC Riddell Open sandy miombo woodland.Mukuvisi Woodland1,20Zimbabwe1731C3C1485

-17.84137531.0861527
118711Cyphostemma rhodesiae23 Dec 2022IC Riddell
 IC Riddell MA Hyde Monavale Vlei, Harare1,770Zimbabwe1731C3C1457

https://www.inaturalist.org/observations/144972728

-17.81074031.0070137
107512Cyrtorchis praetermissa subsp. praetermissa3 Dec 2019IC Riddell
 IC Riddell BT Wursten Monavale, Harare10Zimbabwe1731C3 C1474

INaturalist record: https://www.inaturalist.org/observations/36405595

 7
107510Cyrtorchis praetermissa subsp. praetermissa14 Nov 2018IC Riddell
 IC Riddell BT Wursten In woodlandMukuvisi Woodland, Harare1,20Zimbabwe1731C3 C1500

INaturalist record: https://www.inaturalist.org/observations/18389003

 7
107509Cyrtorchis praetermissa subsp. praetermissa13 Oct 2018IC Riddell
 IC Riddell BT Wursten In woodlandMukuvisi Woodland, Harare1,20Zimbabwe1731C3 C1500

INaturalist record: https://www.inaturalist.org/observations/17488673

 7
113428Diospyros whyteana27 Oct 2020IC Riddell
 IC Riddell 54,1550Zimbabwe1832B2E1987

iNaturalist record

-18.23333132.7944117
118577Erianthemum virescens18 Oct 2022MA Hyde
IC Riddell
 MA Hyde IC Riddell In open ground insandy miombo woodlandMukuvisi Woodland1,20Zimbabwe1731C3C1505

Host plant Vitex payos

-17.85098131.0969847
124963Eulophia cucullata27 Nov 2024IC Riddell
 IC Riddell BT Wursten Haka Game Park, Harare.1,30Zimbabwe1731C3 C1539

In flower. iNaturalist record

 7
118323Eulophia subsaprophytica21 Nov 2022IC Riddell
 IC Riddell BT Wursten Mukuvisi Woodland1,20Zimbabwe1731C3 C1508

https://www.inaturalist.org/observations/142598797. A new species for the Mukuvisi Woodland.

 7
117543Ficus abutilifolia25 Sep 2022IC Riddell
 IC Riddell Miombo woodland regrowth on ironstone hillSummit ridge, Tree Society Arboretum, Lake Chivero110Zimbabwe1730D4C1452

-17.88588430.7674445
117659Filicium decipiens15 May 2022MA Hyde
IC Riddell
 IC Riddell In garden5, Leeds Close, Newlands12Zimbabwe1731C3 C1508

 6
107442Filicium decipiens2 Apr 2019IC Riddell
 IC Riddell MA Hyde In gardenNewlands,Harare12Zimbabwe1731C3 C1508

 7
118319Gladiolus atropurpureus21 Nov 2022IC Riddell
 IC Riddell C Archer Mukuvisi Woodland, Harare1,20Zimbabwe1731C3 C1508

https://www.inaturalist.org/observations/142533378

 7
122803Gladiolus dalenii subsp. dalenii16 Jan 2021IC Riddell
 IC Riddell In vlei grasslandMonavale Vlei, Harare.1,770Zimbabwe1731C3 C1457

https://www.inaturalist.org/observations/68150811

 7
118510Globimetula mweroensis24 Nov 2015IC Riddell
 IC Riddell CCH Jongkind Newlands, Harare10Zimbabwe1731C3C1508

Host: Ficus sur. iNaturalist record

-17.81164031.0809637
118520Globimetula mweroensis10 Aug 2018IC Riddell
 IC Riddell RH Archer Newlands, Harare10Zimbabwe1731C3C1508

Host: Pyracantha. iNaturalist record

-17.81164031.0809637
118521Globimetula mweroensis27 Apr 2019IC Riddell
 IC Riddell CCH Jongkind Chapungu, Harare10Zimbabwe1731C3C1522

Host: Salix. iNaturalist record

-17.84261031.1215387
123956Globimetula mweroensis4 Oct 2022IC Riddell
 IC Riddell MA Hyde Newlands, Harare.10Zimbabwe1731C3C1499

Parasite on Morus alba. iNaturalist record

-17.81895131.0879987
123955Globimetula mweroensis4 Oct 2022IC Riddell
 IC Riddell MA Hyde Newlands, Harare.10Zimbabwe1731C3C1499

Parasite on Fraxinus angustifolia. iNaturalist record

-17.81884631.0888247
123953Globimetula mweroensis4 Oct 2022IC Riddell
 IC Riddell MA Hyde Newlands, Harare.10Zimbabwe1731C3C1499

Parasite on Populus deltoides. iNaturalist record

-17.81871031.0887627
117356Guibourtia conjugata27 Oct 2018IC Riddell
 IC Riddell BT Wursten Dry open woodlandGorhwe pan, Gonarezhou National Park1600Zimbabwe2131D3S480

iNaturalist record

-21.79010331.6647527
102468Habenaria schimperiana5 Feb 2017IC Riddell
 IC Riddell C Peter Monavale Vlei, Harare1,770Zimbabwe1731C3 C1460

ADU OrchidMap record

 7
116059Hibiscus cannabinus25 Mar 2022IC Riddell
 IC Riddell MA Hyde Monavale Vlei1,770Zimbabwe1731C3C1458

https://www.inaturalist.org/observations/109523824

-17.80761031.0070087
114494 (cultivated)Hibiscus tiliaceus (cultivated)28 Mar 2021MA Hyde
M Coates Palgrave
IC Riddell
T Alegria
A Sinclair
J Van Bel
 MA Hyde IC Riddell In garden131, Enterprise Road, Harare12Zimbabwe1731C3C1524

Tree, c. 4 m, with bronzed circular leaves; white-tomentose beneath; Azanza-like fissure on main vein beneath. Flowers yellow with dark centre.

-17.79621431.0988737
119868Indigofera demissa12 Mar 2023MA Hyde
IC Riddell
 IC Riddell MA Hyde Sandy grasslandMukuvisi Woodland1,20Zimbabwe1731C3C1508

Prostrate perennial; leaves with 3-4 pairs of opposite leaflets plus terminal

-17.84176531.0913727
102552Millettia stuhlmannii7 Aug 2019IC Riddell
 IC Riddell BT Wursten Dry and degraded woodland.Eastern Ndowoyo CL, Chipinge0Zimbabwe2032C4E400

INaturalist record

-20.85603732.4862407
116061Nymphaea nouchali var. caerulea25 Mar 2022IC Riddell
 IC Riddell In waterMonavale Vlei, Harare1,770Zimbabwe1731C3C1461

iNaturalist record

-17.80576531.0083407
118611Ochna serrulata18 Oct 2022MA Hyde
IC Riddell
 IC Riddell In garden5, Leeds Close, Newlands12Zimbabwe1731C3C1506

Small shrub, c. 60 cm, lenticellate, in fruit

-17.81148531.0810646
119069Oenothera rosea29 Jan 2023MA Hyde
IC Riddell
 MA Hyde IC Riddell In woodlandBy entry path, Mukuvisi Woodland, Harare1,20Zimbabwe1731C3C1489

-17.83893731.0875697
117351Pontederia crassipes30 Jan 2021IC Riddell
 IC Riddell Crowborough, Harare10Zimbabwe1730D4C1416

iNaturalist record

-17.86006230.9131367
123954Populus deltoides4 Oct 2022IC Riddell
 IC Riddell MA Hyde Newlands, Harare.12Zimbabwe1731C3C1499

iNaturalist record

-17.81871031.0887627
117910Pteridium aquilinum subsp. capense12 Oct 2022IC Riddell
 IC Riddell BT Wursten Mukuvisi Woodland1,20Zimbabwe1731C3C1486

https://www.inaturalist.org/observations/138585744

-17.84888331.0855097
113429Rhoicissus tridentata26 Oct 2020IC Riddell
 IC Riddell Nyanga National Park54,1550Zimbabwe1832B1E1764

iNaturalist record

-18.24981132.7170737
121255Rhynchosia monophylla12 Jul 2023IC Riddell
 IC Riddell C Archer Great Dyke, Mazowe, Zimbabwe.0Zimbabwe1630D4N1715

Quite widespread in short/dwarf miombo on the ridge of dyke. First record for Flora Zambesiaca division N. https://www.inaturalist.org/observations/174823831

-16.84008530.8578637
123985Sagina apetala11 Mar 2021IC Riddell
 IC Riddell MA Hyde In cracks in drive in garden.Leeds Close, Newlands, Harare.10Zimbabwe1731C3C1509

Tiny plant. In flower; sepals 4; petals present, white. iNaturalist record

-17.81140031.0810407
123434Salvinia molesta3 Nov 2023IC Riddell
 IC Riddell In pond in river bedRoad to Masau Lodge, Kanyemba0Zimbabwe1530C2N325

-15.66779130.3550747
119857Sida cordifolia subsp. maculata12 Mar 2023MA Hyde
IC Riddell
 MA Hyde IC Riddell Sandy grasslandMukuvisi Woodland1,20Zimbabwe1731C3C1504

-17.84203931.0893877
112923Trichilia emetica subsp. emetica4 Nov 2019IC Riddell
 IC Riddell BT Wursten Chizarira National Park1610Zimbabwe1727D1N653

iNaturalist record

-17.67905027.7021456
112924Trichilia emetica subsp. emetica21 Sep 2018IC Riddell
 IC Riddell BT Wursten Mana Pools National Park590Zimbabwe1529C4N365

iNaturalist record

-15.77257229.2703847
112925Trichilia emetica subsp. emetica13 Jan 2018IC Riddell
 IC Riddell BT Wursten Sango, Save Valley Conservancy0Zimbabwe2032A1S581

-20.242708Lon:

-20.24270832.0321506
119309Triumfetta annua12 Mar 2023MA Hyde
IC Riddell
 IC Riddell MA Hyde In disturbed ground in the garden.5, Leeds Close, Newlands10Zimbabwe1731C3C1506

Specimen checked, not kept.

-17.81148531.0810646
122736Xylotheca tettensis var. macrophylla2 Nov 2023IC Riddell
 IC Riddell Dande, Guruve0Zimbabwe1530C4N383

iNaturalist record

-15.78625830.3853957
108135Xysmalobium undulatum16 Mar 2020IC Riddell
 IC Riddell BT Wursten Marlborough vlei, Harare10Zimbabwe1730D2C1466

iNaturalist record

-17.73652030.9896187

Copyright: Mark Hyde, Bart Wursten, Petra Ballings and Meg Coates Palgrave, 2002-25

Hyde, M.A., Wursten, B.T., Ballings, P. & Coates Palgrave, M. (2025). Flora of Zimbabwe: Records determined by Ian Riddell.
https://www.zimbabweflora.co.zw/speciesdata/utilities/utility-display-determinations-by-person.php?person_id=250, retrieved 5 December 2025

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