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Key A2: pteridophytes and lycophytes growing as floating or rooted aquatics

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1 Plant with at least some leaves palmately or pinnately lobed or 1-4× pinnately divided (‘fern-like’) and > 2 cm long
1 Plant either a floating aquatic with leaves <5 cm long, or with clover-like or linear leaves.
..2 Plant a floating aquatic
..2 Plant a rooted aquatic.
....3 Plant clover-like, with 4 leaf segments borne terminally
....3 Leaves linear.
......4 Plants cormose or with short rhizomes; leaves numerous, undivided leaves
......4 Plants with creeping rhizomes; leaves few, reduced to a winged petiole
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