A key to the subspecies of Brownleea galpinii
| 1a | Lateral sepals 6-7 mm long; median sepal 5-8 mm long; petals with upper margin not or only slightly crenulate; lip erect, 0.8-1.3 mm long, not reaching to the top of the stigma | subsp. galpinii |
| 1b | Lateral sepals (6.5-) 8-10 mm long; median sepal 7.5-9 mm long; petals with the apical lobe crenulate and fan-like; lip 2-2.6 mm long, reaching over the stigma to between the rostellum lobes | subsp. major |
World Checklist of Monocotyledons. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/monocots/ accessed 01/01/2015
