Ophioglossum

Kessler, Michael & Smith, Alan R., 2017, Prodromus of a fern flora for Bolivia. V. Ophioglossaceae, Phytotaxa 327 (1), pp. 90-94 : 92

Key to the Bolivian species of Ophioglossum

1 Rhizomes globose .............................................................................................................................................. O. crotalophoroides

– Rhizomes cylindrical, sometimes swollen, but not globose ............................................................................................................. 2

2 Sterile leaves stalked, with a 3–8 mm long, dry, membranaceous common stalk ........................................................ O. scariosum

– Sterile leaves sessile or nearly so ...................................................................................................................................................... 3

3 Sterile blades narrowly to broadly elliptic to oblong, mostly 0.5–1(1.5) cm wide, bases cuneate, often narrowly so; midveins usually somewhat distinct, often bordered by a pale band of tissue ................................................................................... O. nudicaule

– Sterile blades cordiform, mostly (2) 3–6 cm wide, bases cordate; midveins indistinct, not bordered by a pale band of tissue .......... ...................................................................................................................................................................................... O. reticulatum