Anathallis, Barbosa Rodrigues, 1877

Krahl, Amauri Herbert, Valsko, Jefferson José, Holanda, Ana Sofia Sousa De & Chiron, Guy, 2016, Anathallis manausensis (Orchidaceae, Pleurothallidinae), a new species from the Brazilian Amazon, Phytotaxa 245 (3), pp. 229-233 : 231-232

Key to species of Anathallis from the Brazilian Amazon

(Adapted from Pessoa et al. 2014 considering Karremans (2014))

1. Ramicaul more than 80 mm long; leaf more than 65 × 20 mm ............................................................................................................ ................................................................................................ A. taracuana ( Schlechter 1925: 91) Barros & Barberena (2010: 129)

- Ramicaul less than 50 mm long; leaf ca. 50 × 15 mm .......................................................................................................................2

2. Ramicaul as long or longer than leaves..............................................................................................................................................3

- Ramicaul shorter than leaves..............................................................................................................................................................4

3. Apex of the sepals acuminate; apex of the petals and labellum papillose............................................................................................ .............................................................................................. A. roseopapillosa E.Pessoa & J.J.Valsko in Pessoa et al. (2014: 1073)

- Apex of the sepals acute; apex of the petals and labellum smooth ...................................................................................................... ........................................................................................... A. brevipes ( Focke 1849: 198–199) Pridgeon & Chase (2001: 247–248)

4. Petals broadly elliptic or obovate.......................................................................................................................................................5

- Petals narrowly elliptic to linear.........................................................................................................................................................7

5. Plant caespitose .................................................................................... A. funerea ( Barbosa Rodrigues 1891: 118) Luer (2009: 258)

- Plant subrepent...................................................................................................................................................................................6

6. Apex of the petals acute; labellum ≥ 3 mm long................ A. polygonoides ( Grisebach 1864: 609) Pridgeon & Chase (2001: 250)

- Apex of the petals obtuse; labellum ≤ 2 mm long.................................. Anathalllis nanifolia ( Foldats 1961: 258) Luer (2009: 259)

7. Peduncle of the inflorescence inconspicuous; labellum entire...........................................................................................................8

- Peduncle of the inflorescence long (10–40 mm long); labellum slightly 3-lobed.............................................................................9

8. Caespitose habit, leaves elliptic somewhat broad (2–4 mm); lateral sepals acute to sub-acute; petals linear ..................................... .............................................................................................................................................. A. manausensis Krahl, Valsko & Chiron

- Sub-repent habit, leaves oblanceolate to elliptic narrower (1.2–3.0 mm); lateral sepals acuminate to long-acute; petals narrow elliptic.................................................................................................................................... A. amazonica Pessoa & Alves (2012: 13)

9. Caespitose habit; petals long-acuminate; leaves oblanceolate or linear-oblanceolate with purple points; 1–3-flowered; flower somewhat orange ........................................................................................... A. humilis ( Schweinfurth 1951: 185) Luer (2009: 258)

- Repent habit; petals acute; leaves lanceolate without any point; 1-flowered; flower whitish ............................................................. ................................................................................................. A. sertularioides ( Swartz 1788: 122) Pridgeon & Chase (2001: 250)