Prescottia

Azevedo, Cecília Oliveira De, Berg, Cássio Van Den & Barros, Fábio De, 2014, A revision of Prescottia (Orchidaceae: Orchidoideae, Cranichideae), Phytotaxa 178 (4), pp. 233-286 : 242-243

Key to species of Prescottia

1. Lip inner surface glabrous ................................................................................................................................................................ 2

- Lip inner surface pubescent ............................................................................................................................................................ 12

2. Lateral sepals erect or pressed against the lip .................................................................................................................................. 3

- Lateral sepals reflexed to revolute .................................................................................................................................................... 6

3. Petal apex truncate; lip apex prominent with undulate margin ....................................................................... Prescottia glazioviana

- Petal apex not truncate; lip apex not prominent with straight margin .............................................................................................. 4

4. Sepals and petals greenish, with some brown; lip whitish to yellowish, 1.2–1.5 mm long ............................ Prescottia mucugensis

- Sepals and petals pale green; lip green, at least 2.5 mm long .......................................................................................................... 5 5. Leaves 2–3, sessile or pseudopetiolate; lip 2.5–4.0 mm long ............................................................................. Prescottia phleoides

- Leaves 1(2), clearly petiolate; lip 4.0–4.8(–6.6) mm long ................................................................................... Prescottia montana

6. Leaf sessile or pseudopetiolate ......................................................................................................................................................... 7

- Leaf clearly petiolate ........................................................................................................................................................................ 8

7. Flowers overlapping; sepals and petals whitish, lip green ...................................................................... Prescottia spiranthophylla

- Flowers not overlapping; sepals, petals and lip greenish .......................................................................... Prescottia plantaginifolia

8. Petiole 1.5–2.0 cm long; lateral sepals reflexed with distal part pressed against ovary................................. Prescottia leptostachya

- Petiole more than 2 cm long; lateral sepals revolute ........................................................................................................................ 9

9. Flowers almost patent; lip with a keel or septum ................................................................................................ Prescottia carnosa

- Flowers erect; lip without a keel or septum .................................................................................................................................... 10

10. Leaf deltoid .................................................................................................................................................. Prescottia ecuadorensis

- Leaf elliptic to ovate ....................................................................................................................................................................... 11

11. Leaf ovate; lip with a prominent midvein .............................................................................................................. Prescottia lojana

- Leaf elliptic to ovate; lip without a prominent midvein .................................................................................. Prescottia stachyodes

12. Inflorescence nodding ......................................................................................................................................... Prescottia lancifolia

- Inflorescence erect .......................................................................................................................................................................... 13

13. Leaf petiolate; flowers not overlapping .............................................................................................................. Prescottia oligantha

- Leaf sessile to pseudopetiolate; flowers overlapping ..................................................................................................................... 14

14. Rachis 1.0–2.0 cm long; lip 1.5–1.7 mm long; leaf sessile.................................................................................... Prescottia ostenii

- Rachis 5.0–14.0 cm long; lip 1.7–2.4 mm long; leaf sessile to pseudopetiolate................................................ Prescottia densiflora