Adiantopsis

Kessler, Michael, Smith, Alan R. & Prado, Jefferson, 2017, Prodromus of a fern flora for Bolivia. XXVII. Pteridaceae, Phytotaxa 332 (3), pp. 201-250 : 204

Key to the Bolivian species of Adiantopsis

1 Blades digitate (sometimes ternate in young plants), with 5–9 pinnae radiating from a central point at the distal end of the stipes. ............................................................................................................................................................................................ A. radiata

- Blades 1-pinnate, ternate (with three 1-pinnate pinnae), or 2-to 3-pinnate-pinnatifid ..................................................................... 2

2 Blades 1-pinnate or ternate, with three pinnae radiating from a central point at the distal end of the stipes ................ A. trifurcata

- Blades 2-pinnate or 2-to 3-pinnate-pinnatifid .................................................................................................................................. 3

3 Stipes filiform, 0.2–0.3 mm diam.; ultimate segments (pinnules) flabellate or cuneate, the larger ones cleft apically, Adiantum - like ........................................................................................................................................................................................ A. senae

- Stipes 0.5–1.5 mm diam.; ultimate segments oblong ....................................................................................................................... 4

4 Blades 2–3-pinnate-pinnatifid, broadly deltate, usually> 10 cm wide proximally .................................................. A. chlorophylla

- Blades 2-pinnate, lanceolate, usually <5 cm wide proximally .................................................................................... A. tweedieana