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Support the Flora of the Southeastern US

2024 has been a banner year for making the best flora we can imagine. We've created:
With financial support from people like you, we are aiming even higher in 2025. Together we can accomplish all this: Vote on our 2025 priorities
  • Add Global Conservation Ranks (GRanks) vote
  • Professional graphic keys (polyclaves) to individual families/genera vote
  • 2 new FloraQuest apps: Florida & Mid-South vote
  • Image overlays highlighting diagnostic characters with arrows vote
  • iNaturalist integration in FloraQuest vote
Write-in vote: vote
We've set a goal of recruiting 200 ongoing supporters to donate $15 or more each month in 2025. Please help us reach this goal and make next year's flora even better:
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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Key to Hydrolea

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1 Flowers in axillary cymes; leaves 1.5-4 cm wide; axillary thorns present in the axils of some leaves; corolla 7-11 mm long.
  2 Calyx and stem sparsely pubescent with spreading, jointed hairs 2-3 mm long
  2 Calyx and stem glabrous, minutely puberulent with simple hairs, or with sessile glands
1 Flowers in terminal cymes or corymbs; leaves 0.2-3.0 cm wide; axillary thorns present or absent; corolla 5-17 mm long.
    3 Stems pubescent or hispid, also usually covered with shorter glandular hairs; [s. TX southwards]
    3 Stems densely pubescent, with few or no glandular hairs; [collectively widespread in se. Coastal Plain from se. TX northwards and eastwards].
      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]
      4 Leaves ovate to ovate-lanceolate, 3-6 cm long, (1.0-) 1.5-2.5 cm wide; leaf margins entire; styles 10-15 mm long; axillary thorns 1-2 per node; [GA and westwards]