Marsilea

Kessler, Michael & Smith, Alan R., 2017, Prodromus of a fern flora for Bolivia. XV. Marsileaceae, Phytotaxa 329 (1), pp. 93-96 : 94

Key to the Bolivian species of Marsilea

1 Land leaves adaxially glabrous or sparsely hairy, abaxially densely hairy; above 2900 m elevation ................................ M. mollis

– Land leaves adaxially and abaxially glabrous or sparsely hairy; below 1000 m elevation .............................................................. 2

2 Rhizomes 1–2.3 mm thick; petioles 0.8–1.5 mm thick; sporocarps 3.1–3.9 × 2.9–3.7 mm, pear-shaped, flattened, attached in the central third of the petioles ......................................................................................................................................... M. crotophora

– Rhizomes 0.5–1.7 mm thick; petioles 0.4–0.9 mm thick; sporocarps 2–2.6 × 1.6–2.1 mm, round to ovate, round in cross-section, attached on the lower half of the petioles ..................................................................................................................... M. polycarpa