| Erica ciliaris x tetralix = E. x watsonii | GB, VC1 West Cornwall, Chacewater | James Henry Augustus Steuart | Watson Botanical Exchange Club Harold Stuart Thompson National Museum of Wales | 9/1894 | BIRM |
| Erica ciliaris x tetralix = E. x watsonii | GB, VC1 West Cornwall, Chacewater | James Henry Augustus Steuart | Watson Botanical Exchange Club National Museum of Wales | 9/1894 | SLBI |
| Herniaria ciliolata | GB, VC1 West Cornwall, Lizard | James Henry Augustus Steuart | James Henry Augustus Steuart | 7/1894 | ABS |
| Teucrium chamaedrys | GB, VC1 West Cornwall, Newbridge | James Henry Augustus Steuart | James Henry Augustus Steuart William Hadden Beeby | 8/1886 | SLBI |
| Echium plantagineum | GB, VC1 West Cornwall, Saint Just | James Henry Augustus Steuart | Harold Stuart Thompson James Henry Augustus Steuart | 7/1884 | BIRM |
+ | Physospermum cornubiense | GB, VC2 East Cornwall, Bodmin | Richard Vercoe Tellam | Charles Bailey James Henry Augustus Steuart | 7/1888 | MANCH |
| Physospermum cornubiense | GB, VC2 East Cornwall, Bodmin | Richard Vercoe Tellam | James Henry Augustus Steuart William Hunt Painter Richard Vercoe Tellam | 7/1891 | ABS |
| Physospermum cornubiense | GB, VC2 East Cornwall, Colquite | Richard Vercoe Tellam | James Henry Augustus Steuart William Hunt Painter | 7/1891 | ABS |
| Physospermum cornubiense | GB, VC2 East Cornwall, Dunmere wood | Richard Vercoe Tellam | James Henry Augustus Steuart William Hunt Painter | 8/1888 | ABS |
| Physospermum cornubiense | GB, VC2 East Cornwall, Dunmere Wood, Bodmin | Richard Vercoe Tellam | James Henry Augustus Steuart William Hunt Painter Richard Vercoe Tellam | 8/1888 | ABS |
| Galium | GB, VC3 South Devon, Exeter | James Henry Augustus Steuart | Botanical Exchange Club of The British Isles Augustin Ley James Alfred Wheldon | 7/7/1891 | BIRM |
| Centaurium erythraea | GB, VC10 Isle of Wight, Afton Down | James Henry Augustus Steuart | | 2/7/1889 | ABS |
| Clinopodium menthifolium | GB, VC10 Isle of Wight, Apesdown | James Henry Augustus Steuart | Watson Botanical Exchange Club Harold Stuart Thompson National Museum of Wales | 9/1888 | BIRM |
| Gentianella anglica | GB, VC10 Isle of Wight, Bembridge | James Henry Augustus Steuart | Botanical Exchange Club of The British Isles James Henry Augustus Steuart William Hadden Beeby | 20/6/1889 to 27/6/1889 | SLBI |
| Carex sylvatica | GB, VC10 Isle of Wight, Bembridge, Steyne Wood | James Henry Augustus Steuart | Royal Botanic Gardens, Kew James Alfred Wheldon | 2/5/1893 | E |
| Filago pyramidata | GB, VC10 Isle of Wight, Bowcombe | James Henry Augustus Steuart | Harold Stuart Thompson James Henry Augustus Steuart James Henry Augustus Steuart | 8/1888 | BIRM |
| Pulmonaria longifolia | GB, VC10 Isle of Wight, Combley Wood | James Henry Augustus Steuart | | 6/1888 | SLBI |
| Centaurium erythraea var. capitatum | GB, VC10 Isle of Wight, Freshwater | James Henry Augustus Steuart | Allan Octavian Hume James Henry Augustus Steuart | 8/1890 | SLBI |
| Centaurium erythraea | GB, VC10 Isle of Wight, Freshwater | James Henry Augustus Steuart | Augustin Ley James Henry Augustus Steuart | 8/1890 | BIRM |
| Centaurium erythraea | GB, VC10 Isle of Wight, Freshwater | James Henry Augustus Steuart | James Henry Augustus Steuart William Hunt Painter | 8/1890 | ABS |
| Serratula tinctoria | GB, VC10 Isle of Wight, Freshwater | James Henry Augustus Steuart | Charles Bailey James Henry Augustus Steuart | 9/1891 | MANCH |
| Serratula tinctoria | GB, VC10 Isle of Wight, Freshwater | James Henry Augustus Steuart | Botanical Exchange Club of The British Isles Augustin Ley James Alfred Wheldon | 8/1891 | BIRM |
| Serratula tinctoria | GB, VC10 Isle of Wight, Freshwater | James Henry Augustus Steuart | Augustin Ley James Henry Augustus Steuart | 9/1891 | BIRM |
| Centaurium erythraea var. capitatum | GB, VC10 Isle of Wight, Freshwater, Afton Down | James Henry Augustus Steuart | William Hadden Beeby | 12/7/1891 | SLBI |
| Centaurium erythraea | GB, VC10 Isle of Wight, Freshwater, Afton Down | James Henry Augustus Steuart | George Goode Harold Stuart Thompson | 2/7/1890 | BIRM |
+ | Agrostemma githago | GB, VC10 Isle of Wight, Freshwater, Isle of Wight | James Henry Augustus Steuart | | 1882 | LIV |
| Pulmonaria longifolia | GB, VC10 Isle of Wight, Guildford Heath | James Henry Augustus Steuart | Harold Stuart Thompson James Henry Augustus Steuart | 28/5/1889 | BIRM |
| Cerastium pumilum | GB, VC10 Isle of Wight, Isle of Wight | James Henry Augustus Steuart | William Robert Sherrin | 5/1889 | SLBI |
| Mentha arvensis x aquatica x spicata = M. x smithiana | GB, VC10 Isle of Wight, Newbridge | James Henry Augustus Steuart | John Durbin Gray | 9/1894 | CGE |
| Carex paniculata x remota = C. x boenninghauseniana | GB, VC10 Isle of Wight, Newchurch | James Henry Augustus Steuart | Charles Bailey Frederick Thompson Mott James Henry Augustus Steuart Henry Peter Reader Thomas Thorp | 5/1893 | MANCH |
| Carex paniculata x remota = C. x boenninghauseniana | GB, VC10 Isle of Wight, Newchurch | James Henry Augustus Steuart | Arthur Bennett | 5/1893 | BM |
| Carex paniculata x remota = C. x boenninghauseniana | GB, VC10 Isle of Wight, Newchurch | James Henry Augustus Steuart | James Henry Augustus Steuart | 5/1893 6/1893 | BM |
| Chenopodium murale | GB, VC10 Isle of Wight, Newchurch | James Henry Augustus Steuart | James Henry Augustus Steuart | 9/1892 | ABS |
| Chenopodium murale | GB, VC10 Isle of Wight, Newchurch | James Henry Augustus Steuart | James Henry Augustus Steuart | 9/1892 | SHYB |
| Carex riparia | GB, VC10 Isle of Wight, Newport | James Henry Augustus Steuart | James Henry Augustus Steuart | 6/1889 | E |
| Arum italicum subsp. neglectum | GB, VC10 Isle of Wight, Saint Lawrence | James Henry Augustus Steuart | Augustin Ley | 9/1890 6/1891 | BIRM |
+ | Cerastium pumilum | GB, VC10 Isle of Wight, Sandown | James Henry Augustus Steuart | Charles Bailey James Alfred Wheldon | 1889 | MANCH |
| Cerastium pumilum | GB, VC10 Isle of Wight, Sandown | James Henry Augustus Steuart | Botanical Exchange Club of The British Isles James Alfred Wheldon | 1889 | BIRM |
| Cerastium pumilum | GB, VC10 Isle of Wight, Sandown | James Henry Augustus Steuart | Botanical Exchange Club of The British Isles Allan Octavian Hume Frederick Townsend James Alfred Wheldon | 1889 | SLBI |
+ | Agrostemma githago | GB, VC10 Isle of Wight, Ventnor | James Henry Augustus Steuart | | 1893 | NMW |