+ | Agrostemma githago | GB, VC10 Isle of Wight, Freshwater, Isle of Wight | James Henry Augustus Steuart | | 1882 | LIV |
+ | Agrostemma githago | GB, VC10 Isle of Wight, Ventnor | James Henry Augustus Steuart | | 1893 | NMW |
| Agrostis canina | GB, VC58 Cheshire, Fishpool | George Alfred Holt | Botanical Exchange Club of The British Isles Augustin Ley James Henry Augustus Steuart | 7/1892 | BIRM |
| Agrostis canina var. mutica | GB, VC58 Cheshire, Oakmere | George Alfred Holt | James Henry Augustus Steuart Watson Botanical Exchange Club John Whitehead | 7/1892 | ABS |
| Agrostis capillaris | GB, VC58 Cheshire, Delamere | George Alfred Holt | Botanical Exchange Club of The British Isles Augustin Ley James Henry Augustus Steuart John Whitehead | 7/1892 | BIRM |
| Anisantha madritensis | GB, VC113 Channel Islands, Portelet Bay, Jersey | Margaret Dawber | Augustin Ley James Henry Augustus Steuart Botanical Exchange Club of The British Isles | 25/6/1888 | BIRM |
| Anthriscus cerefolium | GB, VC36 Herefordshire, Ross | Eleonora Armitage | James Henry Augustus Steuart William Hadden Beeby | 5/1891 | SLBI |
| Anthriscus cerefolium | GB, VC36 Herefordshire, Ross | Eleonora Armitage | Augustin Ley James Henry Augustus Steuart | 5/1891 | BIRM |
| Anthriscus cerefolium | GB, VC36 Herefordshire, Ross | Eleonora Armitage | James Henry Augustus Steuart William Hunt Painter | 5/1891 | ABS |
| Arum italicum subsp. neglectum | GB, VC10 Isle of Wight, Saint Lawrence | James Henry Augustus Steuart | Augustin Ley | 9/1890 6/1891 | BIRM |
| Asarum europaeum | GB, VC25 East Suffolk, Wortham GB, VC26 West Suffolk, Honington Cultivated | William Marsden Hind | James Henry Augustus Steuart | 5/5/1894 | ABS |
| Berteroa incana | GB, VC36 Herefordshire, Peterstow | Eleonora Armitage | James Henry Augustus Steuart William Hunt Painter | 9/1894 | ABS |
| Calamagrostis epigejos x Ammophila arenaria = x Calammophila baltica | GB, VC27 East Norfolk, Caister Sands | James Henry Augustus Steuart | James Henry Augustus Steuart | 8/1887 | ABS |
| Carex appropinquata | GB, VC28 West Norfolk, Stoke Ferry | William J Cross | James Henry Augustus Steuart | 7/1871 | E |
| Carex appropinquata | GB, VC28 West Norfolk, Stoke Ferry | W J Cross | Alexander Somerville James Henry Augustus Steuart | 7/1891 | E |
| Carex appropinquata | GB, VC29 Cambridgeshire, Wicken Fen | J W F Cross | Albert Bruce Jackson James Henry Augustus Steuart | 8/1891 | BM |
| Carex depauperata | GB, VC27 East Norfolk, Ranworth | William Curnow | James Henry Augustus Steuart | 1878 | E |
+ | Carex ericetorum | GB, VC26 West Suffolk, Mildenhall | | Charles Bailey James Henry Augustus Steuart Frederic Henry Ward | 5/5/1887 | MANCH |
| Carex lachenalii | GB, VC92 South Aberdeenshire, Lochnagar | John Whitehead | Edward Francis Linton James Henry Augustus Steuart James Alfred Wheldon | 7/1876 | BM |
| Carex lachenalii | GB, VC92 South Aberdeenshire, Lochnagar | John Whitehead | Anthony Hurt Wolley Dod James Henry Augustus Steuart John Whitehead | 7/1876 | BM |
| Carex otrubae x remota = C. x pseudoaxillaris | GB, VC37 Worcestershire, Madresfield | James Henry Augustus Steuart | Albert Bruce Jackson | 8/1892 | BM |
| Carex otrubae x remota = C. x pseudoaxillaris | GB, VC37 Worcestershire, Malvern | James Henry Augustus Steuart | James Henry Augustus Steuart William Charles Barton | 8/1892 | BM |
| Carex otrubae x remota = C. x pseudoaxillaris | GB, VC37 Worcestershire, Malvern | James Henry Augustus Steuart | Eliza Standerwick Gregory James Henry Augustus Steuart | 7/1892 | BM |
| Carex ovalis | GB, VC37 Worcestershire, Malvern Wells | James Henry Augustus Steuart | James Henry Augustus Steuart William Charles Barton | 8/1892 | BM |
| Carex ovalis | GB, VC37 Worcestershire, Malvern Wells | James Henry Augustus Steuart | Albert Bruce Jackson James Henry Augustus Steuart | 8/1892 | BM |
| Carex ovalis | GB, VC37 Worcestershire, Malvern Wells | James Henry Augustus Steuart | James Henry Augustus Steuart | 7/1892 | BM |
| Carex paniculata x remota = C. x boenninghauseniana | | James Henry Augustus Steuart | Edward Francis Linton James Henry Augustus Steuart | 5/1893 to 6/1893 | BM |
| 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 |
| Carex pulla | GB, VC88 Mid Perthshire, Beinn Heasgarnich | R H McCobrum | James Henry Augustus Steuart | 19/7/1888 | ABS |
| Carex pulla | GB, VC88 Mid Perthshire, Beinn Heasgarnich | R H McCobrum | Harold Stuart Thompson James Henry Augustus Steuart | 19/7/1888 | BIRM |
| Carex riparia | GB, VC10 Isle of Wight, Newport | James Henry Augustus Steuart | James Henry Augustus Steuart | 6/1889 | E |
| 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 |
| Centaurium erythraea | GB, VC10 Isle of Wight, Afton Down | James Henry Augustus Steuart | | 2/7/1889 | ABS |
| 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 |
| 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 |