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No flowers or fruits, but I can't think what else these leaves could belong to. I'm only familiar with the low-elevation var. palmatus.

Calyx 7mm, moderately pubescent on outer surface, Corolla tube 12mm

Common, smaller and thinner leaved than Isoetes occidentalis here

Could there be V. scopariun on the Peninsula? It looks unlike the V. parvifolium that has new, big, bright green leaves.

@geographerdave did I get it right this time?

In open pine woods, gravelly soil near Castle Creek.