KEY TO THE SPECIES

1Number of pinnae 19 or more, rarely fewer in extremely small leaves; pinna-segments usually strongly oblique and falcate; costae glabrous beneath at maturity.
Matonia pectinata
1'Number of pinnae 15 or less, rarely up to 17; pinna-segments subpatent or oblique, straight or only moderately falcate; costae usually hairy beneath.
Matonia foxworthyi