| Apium nodiflorum | GB, VC37 Worcestershire, Purshull Green | Richard Charles L'Estrange Burges | | 21/8/1921 | BIRM |
| Apium nodiflorum | GB, VC55 Leicestershire, Duddington | Richard Charles L'Estrange Burges | | 1/8/1937 | BIRM |
| Apium nodiflorum x inundatum = A. x moorei | IE, VCH24,VCH25, Lanesborough | Richard Charles L'Estrange Burges | | 18/6/1937 | BIRM |
| Apium repens | GB, VC23 Oxfordshire, Oxford, Port Meadow | Richard Charles L'Estrange Burges | | 12/8/1939 | BIRM |
| Apium repens | GB, VC23 Oxfordshire, Oxford,Port Meadow | Richard Charles L'Estrange Burges | | 12/8/1939 | BIRM |
| Arabidopsis thaliana | GB, VC37 Worcestershire, Hartlebury Common | Richard Charles L'Estrange Burges | | 21/5/1932 | BIRM |
| Arabidopsis thaliana | GB, VC69 Westmorland, Furness Abbey | Richard Charles L'Estrange Burges | | 16/7/1929 | BIRM |
| Arabis albida | GB, VC57 Derbyshire, High Tor, Matlock | Richard Charles L'Estrange Burges | | 6/6/1942 | BIRM |
| Arabis alpina | GB, VC104 North Ebudes, Sligachan | Richard Charles L'Estrange Burges | | 20/7/1938 | BIRM |
| Arabis hirsuta | GB, VC36 Herefordshire, Great Doward | Richard Charles L'Estrange Burges | | 17/4/1938 | BIRM |
| Arabis hirsuta | GB, VC49 Caernarvonshire, Devil's Kitchen | Richard Charles L'Estrange Burges | | 21/6/1942 | BIRM |
| Arabis hirsuta | GB, VC69 Westmorland, Grange over Sands | Richard Charles L'Estrange Burges | | 16/7/1929 | BIRM |
| Arabis hirsuta subsp. glabrata | GB, VC45 Pembrokeshire, Tenby | Richard Charles L'Estrange Burges | | 16/8/1936 | BIRM |
| Arabis petraea | GB, VC87 West Perthshire, Stob Garbh | Richard Charles L'Estrange Burges | | 2/7/1936 | BIRM |
| Arabis petraea | GB, VC88 Mid Perthshire, Ben Laoigh [Ben Lui] | Richard Charles L'Estrange Burges | | 17/7/1938 | BIRM |
| Arabis petraea var. hispida | GB, VC94,VC96, Cairn Gorm | Richard Charles L'Estrange Burges | | 5/7/1946 | BIRM |
| Arabis petraea | GB, VC104 North Ebudes, Skye | Richard Charles L'Estrange Burges | | 20/7/1938 | BIRM |
| Arabis scabra | GB, VC34 West Gloucestershire, Penpole Point, Shirehampton | Richard Charles L'Estrange Burges | | 2/4/1932 | BIRM |
| Aristolochia clematitis | GB, VC23 Oxfordshire, Godstow | Richard Charles L'Estrange Burges | | 8/1939 | BIRM |
| Aristolochia clematitis | GB, VC23 Oxfordshire, Godstow Nunnery | Richard Charles L'Estrange Burges | | 19/9/1936 | BIRM |
| Aristolochia clematitis | GB, VC23 Oxfordshire, Godstow Nunnery | Richard Charles L'Estrange Burges | | 19/9/1936 | BIRM |
| Armeria maritima | GB, VC49 Caernarvonshire, Clogwyn Du'r Arddu | Richard Charles L'Estrange Burges | | 22/6/1935 | BIRM |
| Armeria maritima | GB, VC67 South Northumberland, Slaggyford | Richard Charles L'Estrange Burges | | 22/6/1951 | BIRM |
| Armeria maritima | GB, Mid-West Perthshire, Beinn Laoigh | Richard Charles L'Estrange Burges | | 2/7/1936 | BIRM |
| Armeria maritima | GB, VC90 Angus, Meikle Kilrannoch | Richard Charles L'Estrange Burges | | 26/6/1936 | BIRM |
| Armeria maritima | GB, VC98 Argyllshire, Beinn Laoigh | Richard Charles L'Estrange Burges | | 10/7/1939 | BIRM |
| Armeria maritima subsp. maritima | GB, VC45 Pembrokeshire, Tenby | Richard Charles L'Estrange Burges | | 21/8/1935 | BIRM |
| Armeria maritima subsp. maritima | GB, VC113 Channel Islands, Guernsey, Jerbourg | Richard Charles L'Estrange Burges | | 8/9/1948 | BIRM |
| Armeria plantaginea | GB, VC113 Channel Islands, Les Quennevais | Richard Charles L'Estrange Burges | | 6/9/1948 | BIRM |
| Armeria plantaginea | GB, VC113 Channel Islands, Saint Ouen's Bay, Jersey | Richard Charles L'Estrange Burges | | 1/9/1948 | BIRM |
| Armeria plantaginea | GB, VC113 Channel Islands, Saint Ouen's Bay, Jersey | Richard Charles L'Estrange Burges | | 1/9/1948 | BIRM |
| Asarum europaeum | GB, VC8 South Wiltshire, Downton | Richard Charles L'Estrange Burges | | 18/4/1937 | BIRM |
| Asperula cynanchica | GB, VC8 South Wiltshire, Larkhill | Richard Charles L'Estrange Burges | | 8/1941 | BIRM |
| Asperula cynanchica | GB, VC23 Oxfordshire, Taynton | Richard Charles L'Estrange Burges | | 6/8/1939 | BIRM |
| Asperula cynanchica | GB, VC34 West Gloucestershire, Wotton-under-Edge | Richard Charles L'Estrange Burges | | 19/7/1936 | BIRM |
| Asperula cynanchica | GB, VC45 Pembrokeshire, Tenby | Richard Charles L'Estrange Burges | | 12/8/1935 | BIRM |
| Asperula cynanchica | IE, VCH16 West Galway, Roundstone,Dog's Bay | Richard Charles L'Estrange Burges | | 16/8/1949 | BIRM |
| Asperula odorata | GB, VC12 North Hampshire, Ludgershall | Richard Charles L'Estrange Burges | | 19/5/1940 | BIRM |
| Astilbe japonica x chinensis x rosea = A. x arendsii | GB, VC69 Westmorland, Stock Ghyll Force | Richard Charles L'Estrange Burges | | 31/7/1943 | BIRM |
| Astrantia major | GB, VC40 Shropshire, Stoke Wood | Richard Charles L'Estrange Burges | | 25/7/1937 | BIRM |