| Carex vulpina | GB, VC18 South Essex, Waltham Abbey, Essex GB, VC18,VC21, Ponders End | John Benbow | John Benbow | 9/1886 | BM |
| Carex appropinquata | GB, VC20 Hertfordshire, Harefield | John Benbow | John Benbow | 5/1885 | BM |
| Carex paniculata | GB, VC21 Middlesex | John Benbow | Douglas Henry Kent | 1885 | BM |
| Carex appropinquata | GB, VC21 Middlesex, Cowley | John Benbow | | 6/1884 | BM |
| Carex paniculata | GB, VC21 Middlesex, Cowley | John Benbow | John Benbow | 6/1884 | BM |
| Carex otrubae x remota = C. x pseudoaxillaris | GB, VC21 Middlesex, Edgware | | John Benbow | 21/6/1877 | BM |
| Carex appropinquata | GB, VC21 Middlesex, Harefield | John Benbow | John Benbow | 5/1885 | BM |
| Carex appropinquata | GB, VC21 Middlesex, Harefield | John Benbow | John Benbow | 5/1885 | BM |
| Carex appropinquata | GB, VC21 Middlesex, Harefield | John Benbow | | 6/1885 | BM |
| Carex appropinquata | GB, VC21 Middlesex, Harefield | John Benbow | John Benbow | 7/1885 | BM |
| Carex appropinquata | GB, VC21 Middlesex, Harefield | John Benbow | John Benbow | 3/6/1893 | BM |
| Carex paniculata | GB, VC21 Middlesex, Harefield | John Benbow | Douglas Henry Kent | 10/5/1845 | BM |
| Carex paniculata | GB, VC21 Middlesex, Harefield | | John Benbow | 1884 | BM |
| Carex paniculata | GB, VC21 Middlesex, Harefield | John Benbow | John Benbow | 1884 | BM |
| Carex divulsa subsp. divulsa | GB, VC21 Middlesex, Hillingdon | John Benbow | John Benbow | 1881 | BM |
| Carex otrubae x remota = C. x pseudoaxillaris | GB, VC21 Middlesex, Ickenham | John Benbow | John Benbow | 10/6/1886 | BM |
| Carex otrubae x remota = C. x pseudoaxillaris | GB, VC21 Middlesex, Ickenham | John Benbow | | 2/6/1893 | BM |
| Carex divisa | GB, VC21 Middlesex, Isle of Dogs | John Benbow | John Benbow | 10/8/1887 | BM |
| Carex paniculata | GB, VC21 Middlesex, Northolt | John Benbow | John Benbow | 20/6/1887 | BM |
| Carex divulsa subsp. divulsa | GB, VC21 Middlesex, Northwood | John Benbow | | | BM |
| Carex appropinquata | GB, VC21 Middlesex, Springwell Moor | John Benbow | John Benbow | 1885 | BM |
| Carex appropinquata | GB, VC21 Middlesex, Springwell Moor | | John Benbow | 7/1885 | BM |
| Carex appropinquata | GB, VC21 Middlesex, Harefield GB, VC21 Middlesex, Uxbridge | John Benbow | John Benbow | 1884 to 1885 | BM |
| Carex disticha | GB, VC21 Middlesex, Uxbridge | John Benbow | John Benbow | 5/1884 | BM |
| Carex divulsa subsp. divulsa | GB, VC21 Middlesex, Uxbridge | John Benbow | John Benbow | 1881 | BM |
| Carex divulsa subsp. divulsa | GB, VC21 Middlesex, Uxbridge | John Benbow | John Benbow | 5/1884 | BM |
| Carex otrubae x remota = C. x pseudoaxillaris | GB, VC21 Middlesex, Uxbridge | John Benbow | John Benbow | | BM |
| Carex otrubae x remota = C. x pseudoaxillaris | GB, VC21 Middlesex, Uxbridge | John Benbow | John Benbow | 5/7/1885 | BM |
| Carex otrubae x remota = C. x pseudoaxillaris | GB, VC21 Middlesex, Uxbridge | John Benbow | John Benbow | 30/9/1888 | BM |
| Carex otrubae x remota = C. x pseudoaxillaris | GB, VC21 Middlesex, Uxbridge | John Benbow | John Benbow | 7/1890 | BM |
| Carex ovalis | GB, VC21 Middlesex, Uxbridge | John Benbow | John Benbow | 6/1884 | BM |
| Carex remota | GB, VC21 Middlesex, Uxbridge | John Benbow | John Benbow | 1884 | BM |
| Carex riparia | GB, VC21 Middlesex, Uxbridge | John Benbow | John Benbow | 1884 | BM |
| Carex riparia | GB, VC21 Middlesex, Uxbridge | John Benbow | John Benbow | 5/1884 | BM |
| Carex spicata | GB, VC21 Middlesex, Uxbridge | John Benbow | John Benbow | 6/1884 | BM |
| Carex vulpina | GB, VC21 Middlesex, Uxbridge | John Benbow | John Benbow | 1884 | BM |
| Carex acutiformis | GB, VC21 Middlesex, West Drayton | John Benbow | John Benbow | 1884 | BM |
| Carex disticha | GB, VC21 Middlesex, West Drayton | John Benbow | John Benbow | 5/1884 to 6/1884 | BM |
| Carex canescens | GB, VC24 Buckinghamshire, Black Park | John Benbow | John Benbow | 31/5/1890 | BM |
| Carex canescens | GB, VC24 Buckinghamshire, Black Park Lake | John Benbow | John Benbow | 31/5/1890 | BM |
| Carex paniculata | GB, VC24 Buckinghamshire, Denham | John Benbow | John Benbow | 1884 | BM |
| Carex paniculata | GB, VC24 Buckinghamshire, Denham Lock | | John Benbow | 6/1887 | BM |
| Carex appropinquata | GB, VC24 Buckinghamshire, Harefield Moor | John Benbow | John Benbow | 11/6/1900 | BM |
| Carex appropinquata | GB, VC24 Buckinghamshire, Loudwater | John Benbow | Arthur Bennett Charles Edgar Salmon | 27/5/1896 | BM |
| Carex acutiformis | GB, VC21,VC24, Uxbridge | John Benbow | John Benbow | 1884 | BM |
| Carex disticha | GB, VC21,VC24, Uxbridge | | John Benbow | 1884 | BM |
| Carex vulpina | GB, VC21,VC24, Uxbridge | John Benbow | | 5/1884 | BM |
| Carex arenaria | GB, VC85 Fifeshire, Fife | John Benbow | John Benbow H C Benbow | | BM |
| Carex canescens | GB, VC88 Mid Perthshire, Ben Lawers | | John Benbow Haslebach | 8/1891 | BM |