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Key to Hydrolea
https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=40408
4 Leaves elliptic to lanceolate, 2-3 cm long, 0.3-1.0 cm wide; leaf margins serrulate; styles 5-10 mm long; axillary thorns 0-1 per node (often absent); [SC, GA, FL] | |