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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 Hydrangeaceae

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1 Woody vine, climbing by aerial rootlets; petals 7-10; [tribe Hydrangeae]
1 Shrub; petals 4-5 (rarely 10 or many in the cultivars of Deutzia and Philadelphus).
  2 Pubescence of leaves and twigs stellate; stamens 10; [a cultivated exotic, rarely escaped]; [tribe Philadelpheae]
  2 Pubescence of leaves and twigs simple; stamens 8-10 (Hydrangea) or 25-90 (Philadelphus); [natives and exotics].
    3 Leaf blades 10-30 cm long; inflorescences of 25-many flowers; stamens 8-10; [tribe Hydrangeae]
    3 Leaf blades 3-8 cm long; inflorescences of 1-7 flowers; stamens 25-90; [tribe Philadelpheae]