| Silene conica | GB, VC26 West Suffolk, Elveden | Henry Dixon Hewitt | Allan Octavian Hume | 9/6/1907 | SLBI |
| Silene conica | GB, VC26 West Suffolk, Weeting | Henry Dixon Hewitt | Allan Octavian Hume | 2/6/1907 | SLBI |
| Silene otites | GB, VC26 West Suffolk, Barnhamcross Common | Henry Dixon Hewitt | Allan Octavian Hume | 11/7/1906 | SLBI |
| Silene otites | GB, VC26 West Suffolk, Barnhamcross Common | Henry Dixon Hewitt | Allan Octavian Hume | 17/6/1906 | SLBI |
| Silene otites | GB, VC26,VC28, Barnhamcross Common | Henry Dixon Hewitt | Croydon Natural History and Scientific Society Henry Franklin Parsons | 10/7/1906 | SLBI |
| Sium latifolium | GB, VC26 West Suffolk, Brandon | Henry Dixon Hewitt | Allan Octavian Hume | 19/9/1908 | SLBI |
| Solidago virgaurea | GB, VC16 West Kent, Orpington Cultivated GB, VC49 Caernarvonshire, Betws-y-Coed | Henry Dixon Hewitt | Allan Octavian Hume William Henry Griffin | 5/6/1905 | SLBI |
| Suaeda fruticosa | GB, VC28 West Norfolk, Wells-on-Sea | Henry Dixon Hewitt | Allan Octavian Hume | 30/8/1906 | SLBI |
| Suaeda maritima | GB, VC28 West Norfolk, Wells next the Sea | Henry Dixon Hewitt | Allan Octavian Hume | 30/8/1906 | SLBI |
| Teesdalia nudicaulis | GB, VC26 West Suffolk, Icklingham | Henry Dixon Hewitt | Allan Octavian Hume | 21/4/1906 | SLBI |
| Thalictrum minus | GB, VC26,VC28, Barnhamcross Common | Henry Dixon Hewitt | Allan Octavian Hume | 11/7/1906 | SLBI |
| Trifolium scabrum | GB, VC26,VC28, Barnhamcross Common | Henry Dixon Hewitt | Allan Octavian Hume | 11/7/1906 | SLBI |
| Veronica arvensis | GB, VC26 West Suffolk, Icklingham | Henry Dixon Hewitt | Allan Octavian Hume | 26/5/1906 | SLBI |
| Veronica spicata | GB, VC28 West Norfolk, Thetford | Henry Dixon Hewitt | | 8/1929 | SLBI |
| Astragalus danicus | GB, VC26 West Suffolk, Eriswell | Henry Dixon Hewitt | | 1914 | K |
| Astragalus danicus | GB, VC28 West Norfolk, Thetford Heath | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 7/1906 | K |
| Astragalus danicus | GB, VC28 West Norfolk, West Harling | Henry Dixon Hewitt | Herbert Stanley Redgrove | 5/1923 | K |
| Carex ericetorum | GB, VC28 West Norfolk, Thetford | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 1/6/1947 | K |
| Dianthus deltoides | GB, VC28 West Norfolk, Brettenham | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 5/9/1909 | K |
| Dianthus deltoides | GB, VC28 West Norfolk, Brettenham | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 5/9/1909 | K |
| Dianthus deltoides | GB, VC28 West Norfolk, Brettenham | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 5/9/1909 | K |
| Habenaria viride | GB, VC57 Derbyshire, Longstone Edge | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 20/8/1914 | K |
| Hypochaeris glabra | GB, VC26 West Suffolk, Thetford warren | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 11/6/1922 | K |
| Hypochaeris glabra | GB, VC28 West Norfolk, Santon Warren | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 24/9/1910 | K |
| Lamium amplexicaule | GB, VC15 East Kent, Malling | Henry Dixon Hewitt | | 1906 | K |
| Lamium amplexicaule | GB, VC28 West Norfolk, Weeting | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 29/4/1944 | K |
| Linaria purpurea | GB, VC28 West Norfolk, Thetford | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 17/7/1941 | K |
| Linaria vulgaris x repens = L. x sepium | GB, VC44 Carmarthenshire, Velindre | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | | K |
| Mentha aquatica | GB, VC26 West Suffolk, Bury St Edmunds, Horringer | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 8/8/1917 | K |
| Mentha arvensis | GB, VC29 Cambridgeshire, Fowlmere | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 5/8/1923 | K |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC28 West Norfolk, Larlingford | Henry Dixon Hewitt | | 6/8/1943 | K |
| Oenanthe fistulosa | GB, VC28 West Norfolk, Dereham | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 28/7/1900 | K |
| Plantago lanceolata | GB, VC28 West Norfolk, Santon Warren | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 8/7/1944 | K |
| Scrophularia vernalis | GB, VC26 West Suffolk, Fornham Saint Genevieve | Henry Dixon Hewitt | | 13/5/1906 | K |
| Silene conica | GB, VC26 West Suffolk, Elveden | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 9/11/1907 | K |
| Silene conica | GB, VC28 West Norfolk, Weeting | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 3/6/1907 | K |
| Silene conica | GB, Norfolk, Weeting | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 3/6/1907 | K |
| Sium latifolium | GB, VC26 West Suffolk, Lakenheath | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 25/7/1908 to 3/10/1908 | K |
| Stachys palustris | GB, VC11 South Hampshire, Matley Bog | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 12/8/1901 | K |
| Thymus | GB, VC4 North Devon, Hunters Inn | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 19/8/1910 | K |
| Thymus chamaedrys | GB, VC13 West Sussex, Bow Hill | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 20/9/1948 | K |
| Thymus chamaedrys | GB, VC13 West Sussex, Lavant | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 20/9/1948 | K |
| Verbascum virgatum | GB, VC28 West Norfolk, Brettenham | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 24/9/1921 | K |
| Veronica arvensis | GB, VC26 West Suffolk, Icklingham | Henry Dixon Hewitt | | 5/5/1906 | K |
| Veronica spicata | GB, VC28 West Norfolk, West Harling | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 6/8/1922 | K |
| Veronica triphyllos | GB, VC26 West Suffolk, Barnham | Henry Dixon Hewitt | | 28/5/1933 | K |
| Veronica verna | GB, VC26 West Suffolk, Thetford warren | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 22/5/1921 | K |
| Veronica verna | GB, VC26 West Suffolk, Thetford warren | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 22/5/1921 | K |