+ | Saxifraga hypnoides | GB, VC90 Angus, Forfar | David J Powrie | W Horton-Smith | 7/1878 | MANCH |
+ | Saxifraga hirculus | GB, VC83 Midlothian, Edinburgh | W Horton-Smith | W Horton-Smith | 10/9/1878 | MANCH |
| Sanicula europaea | | W Horton-Smith | | | MANCH |
| Sanicula europaea | GB, VC51 Flintshire, Holywell | W Horton-Smith | | 29/7/1917 | MANCH |
| Sanicula europaea | GB, VC51 Flintshire, Mold, Loggerheads | W Horton-Smith | | 18/6/1916 | MANCH |
| Sanicula europaea | GB, VC83 Midlothian, Penicuik | W Horton-Smith | | 4/6/1877 | MANCH |
| Salix viminalis x cinerea = S. x holosericea | GB, VC58 Cheshire, Billinge Green | W Horton-Smith | | 17/5/1916 | MANCH |
| Salix viminalis x aurita = S. x fruticosa | GB, VC58 Cheshire, Hatchmere | W Horton-Smith | | 10/4/1916 to 21/6/1916 | MANCH |
| Salix purpurea x repens = S. x doniana | GB, VC58 Cheshire, Little Budworth Cultivated | W Horton-Smith | | 27/5/1919 | MANCH |
| Salix cinerea x repens = S. x subsericea | GB, VC58 Cheshire, Allostock | W Horton-Smith | | 12/4/1916 14/7/1916 | MANCH |
| Salix cinerea x repens = S. x subsericea | GB, VC58 Cheshire, Allostock | W Horton-Smith | | 12/4/1916 14/7/1916 | MANCH |
| Salix cinerea x aurita = S. x multinervis | GB, VC58 Cheshire, Allostock | W Horton-Smith | | 12/4/1916 14/7/1916 | MANCH |
| Salix cinerea x aurita = S. x multinervis | GB, VC58 Cheshire, Allostock | W Horton-Smith | | 11/4/1916 to 14/6/1916 | MANCH |
| Salix cinerea x aurita = S. x multinervis | GB, VC58 Cheshire, Allostock | W Horton-Smith | | 14/7/1916 | MANCH |
| Salix cinerea x aurita = S. x multinervis | GB, VC58 Cheshire, Allostock | W Horton-Smith | | 12/4/1916 | MANCH |
| Salix cinerea x aurita = S. x multinervis | GB, VC58 Cheshire, Hatchmere | W Horton-Smith | | 9/4/1916 21/6/1916 | MANCH |
| Salix cinerea x aurita = S. x multinervis | GB, VC58 Cheshire, Marbury | W Horton-Smith | W Horton-Smith | 24/5/1916 | MANCH |
| Salix cinerea x aurita = S. x multinervis | GB, VC58 Cheshire, Pickmere | W Horton-Smith | | 11/4/1916 to 8/6/1916 | MANCH |
| Salix cinerea x aurita = S. x multinervis | GB, VC58 Cheshire, Rudheath | W Horton-Smith | | 29/4/1916 14/6/1916 | MANCH |
| Salix cinerea x aurita = S. x multinervis | GB, VC58 Cheshire, Rudheath | W Horton-Smith | | 25/4/1916 21/6/1916 | MANCH |
| Salix cinerea x aurita = S. x multinervis | GB, VC58 Cheshire, Rudheath | W Horton-Smith | | 25/4/1916 | MANCH |
| Salix cinerea x aurita = S. x multinervis | GB, VC58 Cheshire, Wincham | W Horton-Smith | | 11/4/1916 8/6/1916 | MANCH |
| Salix caprea x aurita = S. x capreola | GB, VC58 Cheshire, Allostock | W Horton-Smith | | 12/6/1916 | MANCH |
| Salix caprea x aurita = S. x capreola | GB, VC58 Cheshire, Allostock | W Horton-Smith | | 14/6/1916 | MANCH |
| Salix aurita x repens = S. x ambigua | GB, VC58 Cheshire, Wincham | W Horton-Smith | | 18/5/1916 | MANCH |
| Salix aurita x repens = S. x ambigua | GB, VC58 Cheshire, Wincham | W Horton-Smith | | 18/5/1916 | MANCH |
+ | Sagina saginoides | GB, Perthshire, Perthshire | K M Webb | W Horton-Smith | 14/8/1878 | MANCH |
| Rumex crispus x obtusifolius = R. x pratensis | GB, VC51 Flintshire, Prestatyn | W Horton-Smith | | 6/8/1916 | MANCH |
| Rorippa palustris | GB, VC28 West Norfolk, Fakenham | W Horton-Smith | | | MANCH |
| Rorippa palustris | GB, VC50 Denbighshire, Bowling Bank | W Horton-Smith | | 26/8/1917 | MANCH |
| Rorippa palustris | GB, VC58 Cheshire, Knutsford | W Horton-Smith | | 30/7/1916 | MANCH |
| Rorippa palustris | GB, VC58 Cheshire, Northwich, Witton Brook | W Horton-Smith | | 11/6/1916 | MANCH |
| Rorippa palustris | GB, VC58 Cheshire, Whitegate, Bradford Mill | W Horton-Smith | | 26/7/1916 | MANCH |
| Rorippa palustris | GB, VC58 Cheshire, Witton | W Horton-Smith | Schill | 26/8/1915 | MANCH |
| Rorippa nasturtium-aquaticum | GB, VC83 Midlothian, Duddingston | W Horton-Smith | | 22/6/1878 | MANCH |
+ | Romulea columnae | GB, VC3 South Devon, Torquay,Dawlish Warren | W D Hincks | Schill W Horton-Smith | 4/1841 | MANCH |
| Ranunculus repens | GB, VC58 Cheshire, Northwich | W Horton-Smith | | 3/5/1916 | MANCH |
| Ranunculus repens | GB, VC82 East Lothian, Longniddry | W Horton-Smith | | 9/6/1877 | MANCH |
| Ranunculus bulbosus | GB, VC83 Midlothian, Edinburgh | W Horton-Smith | | 5/1877 | MANCH |
| Ranunculus acris | GB, VC58 Cheshire, Bartington | W Horton-Smith | | 15/5/1918 | MANCH |