| Lamium purpureum var. hybridum | GB, VC41 Glamorganshire | John Patrick Micklethwait Brenan | | | K |
| Plantago coronopus | GB, VC10 Isle of Wight, Freshwater | John Patrick Micklethwait Brenan | John Patrick Micklethwait Brenan | | K |
+ | Valerianella dentata | GB, VC25 East Suffolk | J.N.M John Patrick Micklethwait Brenan June R J Mills | | 7/8/1846 | MANCH |
+ | Myriophyllum verticillatum | GB, VC30 Bedfordshire | John Norton Mills John Patrick Micklethwait Brenan | Botanical Exchange Club of The British Isles | 11/8/1906 | MANCH |
| Linaria supina | GB, VC2 East Cornwall, Par Sands | John Patrick Micklethwait Brenan | | 28/8/1934 | K |
| Glechoma hederacea | GB, VC16 West Kent, Tonbridge | John Patrick Micklethwait Brenan | | 5/4/1935 | K |
| Draba muralis | GB, VC6 North Somerset, Easton-in-Gordano | John Patrick Micklethwait Brenan | John Patrick Micklethwait Brenan | 20/4/1935 | SLBI |
| Callitriche stagnalis | GB, VC17 Surrey, Godalming | John Patrick Micklethwait Brenan | | 25/5/1935 | K |
| Callitriche truncata | GB, VC16 West Kent, Chipstead | John Patrick Micklethwait Brenan | | 10/7/1935 | K |
| Dactylis glomerata | GB, VC28 West Norfolk, Appleton | Charles Edward Hubbard | John Patrick Micklethwait Brenan | 12/7/1935 | K |
| Mentha arvensis | GB, VC14 East Sussex, Broadwater Forest | John Patrick Micklethwait Brenan | | 25/7/1935 | K |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC14,VC15,VC16, Hawkhurst | John Patrick Micklethwait Brenan | | 3/8/1935 | K |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC6 North Somerset, Bath,Twerton | John Patrick Micklethwait Brenan | | 25/8/1935 | K |
| Mentha spicata x suaveolens = M. x villosa | GB, VC6 North Somerset, Publow | John Patrick Micklethwait Brenan | | 3/9/1935 | K |
| Glebionis segetum | GB, VC35 Monmouthshire, Chepstow | John Patrick Micklethwait Brenan | | 11/9/1935 | K |
| Mentha suaveolens | GB, VC41 Glamorganshire, Cardiff, Cardiff Docks | Cecil Ivry Sandwith John Patrick Micklethwait Brenan | | 11/9/1935 | K |
| Limosella aquatica | GB, VC41 Glamorganshire, Morfa Pool | John Patrick Micklethwait Brenan | | 12/9/1935 | K |
| Lamium purpureum var. hybridum | GB, VC16 West Kent, Hildenborough | John Patrick Micklethwait Brenan | | 28/3/1936 | K |
| Mentha arvensis x aquatica x spicata = M. x smithiana | GB, VC33 East Gloucestershire, Compton Abdale | John Patrick Micklethwait Brenan | | 10/4/1936 | K |
| Glechoma hederacea | GB, VC15 East Kent, Sellindge | John Patrick Micklethwait Brenan | | 17/4/1936 | K |
| Lamium album | GB, VC16 West Kent, Tonbridge | John Patrick Micklethwait Brenan | | 9/5/1936 | K |
| Callitriche obtusangula | GB, VC4 North Devon, Appledore | John Patrick Micklethwait Brenan | | 21/5/1936 | K |
| Callitriche intermedia subsp. hamulata | GB, VC14 East Sussex, Chailey Common | John Patrick Micklethwait Brenan | John Patrick Micklethwait Brenan | 23/5/1936 | K |
| Callitriche intermedia subsp. hamulata | GB, VC16 West Kent, Snodland | John Patrick Micklethwait Brenan | | 28/5/1936 | K |
| Dactylis glomerata | GB, VC16 West Kent, Snodland | John Patrick Micklethwait Brenan | | 28/5/1936 | K |
| Carex hirta | GB, VC23 Oxfordshire, Oxford | | John Patrick Micklethwait Brenan | 3/6/1936 | BM |
| Glebionis segetum | GB, VC16 West Kent, Tunbridge | John Patrick Micklethwait Brenan | | 28/6/1936 | K |
| Phalaris arundinacea | GB, VC16 West Kent, Tonbridge | John Patrick Micklethwait Brenan | | 28/6/1936 | K |
| Glebionis segetum | GB, VC16 West Kent, Sevenoaks | John Patrick Micklethwait Brenan | | 19/7/1936 | K |
| Linaria repens | GB, VC15 East Kent, Richborough Port | John Patrick Micklethwait Brenan | | 27/8/1936 | K |
| Glebionis segetum | GB, VC18 South Essex, Dagenham | John Patrick Micklethwait Brenan | | 30/8/1936 | K |
| Mentha spicata | GB, VC6 North Somerset, Weston | John Patrick Micklethwait Brenan | | 4/9/1936 | K |
| Callitriche stagnalis | GB, VC6 North Somerset, Cheddar | John Patrick Micklethwait Brenan | | 8/9/1936 | K |
| Callitriche truncata | GB, VC5 South Somerset, Taunton | John Patrick Micklethwait Brenan | | 8/9/1936 | K |
| Cuscuta epithymum | GB, VC15 East Kent, Dungeness | John Patrick Micklethwait Brenan Noel Yvri Sandwith | | 20/9/1936 | K |
| Hypochaeris glabra | GB, VC15 East Kent, Dungeness | John Patrick Micklethwait Brenan | | 20/9/1936 | K |
| Bupleurum tenuissimum | GB, VC11 South Hampshire, Hayling Island | John Patrick Micklethwait Brenan | | 1/10/1936 | K |
| Glechoma hederacea | GB, VC1 West Cornwall, Ponsanooth | John Patrick Micklethwait Brenan | John Patrick Micklethwait Brenan | 26/3/1937 | K |
| Ranunculus aquatilis | GB, VC23 Oxfordshire, Menmarsh | John Frederick Gustav Chapple John Patrick Micklethwait Brenan | John Patrick Micklethwait Brenan | 29/4/1937 | SLBI |
| Plantago coronopus | GB, VC6 North Somerset, Steep Holm | Cecil Ivry Sandwith John Patrick Micklethwait Brenan | | 30/5/1937 | K |