Danaea (Christenhusz, 2010)

Christenhusz, Maarten J. M., Almeida, Erton M. & Felix, Leonardo P., 2018, A new species Danaea (Marattiaceae) from the Atlantic forests of Brazil, Phytotaxa 356 (3), pp. 226-232 : 231

Key to the species of Danaea in Atlantic Brazil

1. Rhizome erect. Pinna margins entire or slightly sinuate, but not toothed..........................................................................................2

–. Rhizome creeping. Pinna margins toothed at least near the apex ......................................................................................................4

2. Largest lateral pinnae 1–3(–4) cm wide; petioles glossy, dark purple throughout; pinnae occasionally with additional pinnules at base....................................................................................................................... D. atlantica Christenh., E.M.Almeida & L.P.Felix

–. Largest lateral pinnae 3–6 cm wide; petioles dull, green throughout or slightly tinged purple at the base near the rhizome attachment...........................................................................................................................................................................................3

3. Rhizomes tall and slender, up to 110 cm long. Leaves well-spaced. Lateral pinnae dull above, abruptly acuminate......................... ................................................................................................................................................... D. arbuscula Christenh. & Tuomisto

–. Rhizomes shorter and stout, up to 50 cm long. Leaves more crowded. Lateral pinnae usually glossy above, gradually acute to longacuminate............................................................................................................................................................. D. geniculata Raddi

4. Rhizomes dorsiventral, rooting only on the lower side. Petioles without nodes.................................................................................. ..................................................................................................................... D. sellowiana C.Presl [= D. nodosa auct. non (L.) Sm.]

–. Rhizomes radial, rooting on all sides. Petioles with 1–3(–4) nodes...................................................................................................5

5. Pinnae apices acute-acuminate with caudate-spathulate, sharply serrated tips. Pinnae linear-oblanceolate, widest near the apex..... .......................................................................................................................................................................... D. excurrens Rosenst.

–. Pinna apices sharply denticulate to serrulate, without spathulate tips. Pinnae ovate-lanceolate, widest in the middle or at the base. ........................................................................................................................................................................... D. moritziana C.Presl