Habenaria sect. Microdactylae, Kranzlin, 1892

Batista, João A. N., Reis, André F. De S., Leite Junior, Josefran L. & Bianchetti, Luciano De Bem, 2018, Phylogeny and taxonomy of Habenaria leprieurii, H. alpestris and H. sect. Microdactylae (Orchidaceae), with descriptions of two new taxa, Phytotaxa 373 (4), pp. 241-271 : 247

Key to the species of Habenaria sect. Microdactylae

1. Inflorescence usually congested, average of 2.1–4.9 flowers/cm of inflorescence; perianth usually bright yellow, occasionally green ........................................................................................................................................................................... H. heptadactyla

- Inflorescence lax, average of 0.7–1.5 flowers/cm of inflorescence; perianth green, white or greenish-white (yellowish in H. cruegeri var. flaviflora )......................................................................................................................................................................2

2. Pedicellate ovary straight, parallel to the inflorescence axis, curved only at the apex; corolla green or yellow; lateral sepals 1.1– 1.3(–1.6) mm wide.............................................................................................................................................................................3

- Pedicellate ovary arched, subparallel to the inflorescence axis, curved throughout its length; corolla white or greenish-white; lateral sepals 1.4–3.4 mm wide..........................................................................................................................................................4

3. Plants from seasonally to permanently wet meadows; stem 9–30(–40) cm long including the inflorescence; flowers (1–)2–6(–9); sepals green, petals and lip green to greenish-brown; pedicellate ovary (11.0–)13.0–16.0 mm long; spur (7.0–)8.0–11.0 mm long ........................................................................................................................................................................................... H. cruegeri

- Plants from dry grassy fields (campo limpo seco); stem 33–44 cm long including the inflorescence; flowers 10–13; sepals green, petals and lip yellow to greenish-yellow; pedicellate ovary 8.0–10.0 mm long; spur 6.0– 7.5 mm long............................................. .................................................................................................................................................................... H. cruegeri var. flaviflora

4. Pedicellate ovary 19–24(–34) mm long; pedicel (6.5–)8.0–10.0(–15.0) mm long .......................................................... H. leprieurii

- Pedicellate ovary 11–17 mm long; pedicel 2.0–5.0 mm long .............................................................................................. H. omissa