Ophioglossaceae

1. Vegetative blades simple, entire; sporangia imbedded in the rachis of a spike.

Ophioglossum

1. Vegetative blades pinnately lobed, dissected, or even more compounded (except in extremely depauperate individuals); sporangia fully exposed, often on a branched structure.

2. Vegetative blades persisting over winter; blades with distinct petiole, usually 5–25 cm long in fertile individuals, but dwarfed plants occasional, leaf texture somewhat leathery; vegetative individuals common in populations; fertile portion of leaf joining the vegetative portion at or near ground level.

Sceptridium

2. Vegetative blades (and entire plant) deciduous; blades usually ± sessile, large (>>5cm) or much smaller, membranous, herbaceous, or sometimes ± succulent in texture; most individuals in populations fertile; fertile portion of leaf joining the vegetative portion well above ground level.

3. Vegetative blades deltate, 3–4x pinnate, sessile and mostly 5–25 cm broad; fertile portion of blade erect , suggesting a continuation of the common stalk.

Botrypus

3. Vegetative blades short-deltate, oblong, or linear, lobed (simple) to 3-pinnate (typically 1-pinnate to 2-pinnate pinnatifid), 1–5 (–10) cm broad; fertile portion of blade frequently ascending, spreading, or even perpendicular to the common stalk.

Botrychium

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. May 24, 2017. http://michiganflora.net/family.aspx?id=Ophioglossaceae.