| 1 | Pollen cones less than 3 cm long; leaf elliptic, somewhat revolute, adult leaves less than 5 cm long |
| 1' | Pollen cones more than 3 cm long; leaf mostly lanceolate or linear-lanceolate, not revolute, adult leaves at least 5 cm long. |
| 2 | Leaf linear-lanceolate or linear, midrib broad and blunt on the upper side (no crest on fruit) |
| 2' | Leaf lanceolate, midrib sharp and narrow on the upper side. |
| 3 | Leaves more than 7 mm wide; scales at base of pollen cone long triangular; fruit with a crest. |
| 3' | Leaves less than 8 mm wide; scales at base of pollen cone broad and rounded; fruit blunt |
| 4 | Leaves mostly over 10 mm wide; foliola at base of receptacle more than 3 mm long; bud for pollen cone 4-5 mm in diameter; pollen cone initially sessile, when mature with an elongated scaly base |
| 4' | Leaves mostly less than 10 mm wide; foliola at base of receptacle up to 3.4 mm long; bud for pollen cone c. 2 mm in diameter; pollen cone with a short peduncle to 2 mm. |
