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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Key to Astrolepis

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1 Largest pinnae 4-7 mm long; scales of the upper surface of the leaf blade circular to elliptic, peltate
1 Largest pinnae 7-35 mm long; scales of the upper surface of the leaf blades elongate, attached on one end
..2 Scales of the upper leaf surface dense and usually persistent; largest pinnae asymmetrically lobed or entire; [rare eastern disjunct known from AL]
..2 Scales of the upper leaf surface sparse and usually deciduous; largest pinnae usually symmetrically lobed; [TX westwards and southwestwards, also rare eastern disjunct known from GA and SC]
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