- IPNI Life Sciences Identifier (LSID)
- The Flora of Berkshire; being a topographical and historical account of the flowering plants and ferns found in the county, with short biographical notices of the botanists who have contributed to Berkshire botany during the last three centuries. Oxford
- Family as entered in IPNI
- H. conopsea, Benth
- Same citation as
- Habenaria gymnadenia Druce, Fl. Berks. 479 (1897), in adnot.