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How are the veins in cycad leaflets arranged?
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Cycadophyte
Cycas circinalis.
The arrangement of veins in cycad leaflets varies by genus:
- Pinnately veined: The genera Stangeria and Chigua are unique in possessing leaflets with a distinct midrib and side veins.1
- Midrib only: Cycas pinnae feature a midrib but lack side veins entirely.1
- Dichotomously branching: In all other cycad genera, the leaflets contain veins that branch dichotomously and are arranged in a more or less parallel fashion.1