| 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 |
| Muscari comosum | GB, VC28 West Norfolk, Thetford Cultivated | Henry Dixon Hewitt | | 9/6/1907 | SLBI |
| Silene conica | GB, VC26 West Suffolk, Elveden | Henry Dixon Hewitt | Allan Octavian Hume | 9/6/1907 | SLBI |
| Alyssum alyssoides | GB, VC26 West Suffolk, Brandon | Henry Dixon Hewitt | Allan Octavian Hume | 16/6/1907 | SLBI |
| Astragalus danicus | GB, VC26 West Suffolk, Thetford Heath | Henry Dixon Hewitt | Allan Octavian Hume | 2/7/1907 | SLBI |
| Scleranthus perennis | GB, VC26 West Suffolk, Barnhamcross Common | Henry Dixon Hewitt | Allan Octavian Hume | 20/7/1907 | SLBI |
| Artemisia campestris | GB, VC28 West Norfolk, Thetford | Henry Dixon Hewitt | Allan Octavian Hume | 13/8/1907 | SLBI |
| Epipactis helleborine | GB, VC44 Carmarthenshire, Llandovery | Henry Dixon Hewitt | Allan Octavian Hume | 27/8/1907 | SLBI |
| Crassula tillaea | GB, VC28 West Norfolk, Tofts Heath | Henry Dixon Hewitt | Allan Octavian Hume | 15/9/1907 | SLBI |
| Crassula tillaea | GB, VC28 West Norfolk, Tofts Heath | Henry Dixon Hewitt | Allan Octavian Hume | 21/9/1907 | SLBI |
| Silene conica | GB, VC26 West Suffolk, Elveden | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 9/11/1907 | K |
| Sium latifolium | GB, VC26 West Suffolk, Lakenheath | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 25/7/1908 to 3/10/1908 | K |
| Lotus glaber | GB, VC27 East Norfolk, Overstrand | Henry Dixon Hewitt | Allan Octavian Hume | 15/8/1908 | SLBI |
| Oenanthe aquatica | GB, VC26 West Suffolk, Brandon | Henry Dixon Hewitt | Allan Octavian Hume | 19/9/1908 | SLBI |
| Oenanthe aquatica | GB, VC26 West Suffolk, Brandon | Henry Dixon Hewitt | Allan Octavian Hume | 19/9/1908 | SLBI |
| Sium latifolium | GB, VC26 West Suffolk, Brandon | Henry Dixon Hewitt | Allan Octavian Hume | 19/9/1908 | SLBI |
| Erysimum cheiranthoides | GB, VC26 West Suffolk, Lakenheath | Henry Dixon Hewitt | Allan Octavian Hume | 4/10/1908 | SLBI |
| 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 |
| Persicaria minor | GB, VC28 West Norfolk, Ring Mere | Henry Dixon Hewitt | Allan Octavian Hume | 12/9/1909 | SLBI |
| Persicaria minor | GB, VC28 West Norfolk, Ring Mere | Henry Dixon Hewitt | Allan Octavian Hume | 12/9/1909 | SLBI |
| Rumex maritimus | GB, VC28 West Norfolk, East Wretham Heath | Henry Dixon Hewitt | Allan Octavian Hume | 13/9/1909 | SLBI |
| Rumex maritimus | GB, VC28 West Norfolk, Ring Mere | Henry Dixon Hewitt | Isaac A Helsby William Robert Sherrin | 13/9/1909 | SLBI |
| Thymus | GB, VC4 North Devon, Hunters Inn | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 19/8/1910 | K |
| Hypochaeris glabra | GB, VC28 West Norfolk, Santon Warren | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 24/9/1910 | K |
| Carex disticha | GB, VC28 West Norfolk, Thetford | Henry Dixon Hewitt | Allan Octavian Hume | 10/6/1911 | SLBI |
| Astragalus danicus | GB, VC26 West Suffolk, Eriswell | Henry Dixon Hewitt | | 1914 | K |
| Habenaria viride | GB, VC57 Derbyshire, Longstone Edge | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 20/8/1914 | K |
| Mentha aquatica | GB, VC26 West Suffolk, Bury St Edmunds, Horringer | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 8/8/1917 | 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 |
| Verbascum virgatum | GB, VC28 West Norfolk, Brettenham | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 24/9/1921 | K |
| Hypochaeris glabra | GB, VC26 West Suffolk, Thetford warren | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 11/6/1922 | K |
| Veronica spicata | GB, VC28 West Norfolk, West Harling | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 6/8/1922 | K |
| Astragalus danicus | GB, VC28 West Norfolk, West Harling | Henry Dixon Hewitt | Herbert Stanley Redgrove | 5/1923 | K |
| Mentha arvensis | GB, VC29 Cambridgeshire, Fowlmere | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 5/8/1923 | K |
| Veronica spicata | GB, VC28 West Norfolk, Thetford | Henry Dixon Hewitt | | 8/1929 | SLBI |
| Veronica triphyllos | GB, VC26 West Suffolk, Barnham | Henry Dixon Hewitt | | 28/5/1933 | K |
| Linaria purpurea | GB, VC28 West Norfolk, Thetford | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 17/7/1941 | K |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC28 West Norfolk, Larlingford | Henry Dixon Hewitt | | 6/8/1943 | K |
| Lamium amplexicaule | GB, VC28 West Norfolk, Weeting | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 29/4/1944 | K |
| Plantago lanceolata | GB, VC28 West Norfolk, Santon Warren | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 8/7/1944 | K |
| Carex ericetorum | GB, VC28 West Norfolk, Thetford | Henry Dixon Hewitt | Benjamin Thompson Lowne jnr | 1/6/1947 | 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 |
| Eriophorum angustifolium | GB, VC45 Pembrokeshire, Marloes Mere | Henry Dixon Hewitt | | 28/6/1959 | SLBI |