- Fargher; Garrad 1984
- IFC S 897: 81
269.Gardeners’ Chronicle (1871: I), 45,
106 - Britten & Holland, 172
- Gepp, 45
- Johnston 1853, 159
- Woodruffe-Peacock
244 Notes
- Briggs 1880; Wright, 241; Lafont
- Parkinson, 30
- Lafont
- Macpherson MS
- IFC S 897: 263
- Beith
- Vickery 1995
- Cameron
- Lafont