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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 Marsilea

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1 Leaves strongly bicolored (pale green toward the base of each of the 4 leaflets, darker green toward the tip); aquatic forms with a swollen air bladder just below the leaf
1 Leaves unicolored.
  2 Roots present (1-3) between the nodes, as well as at the nodes.
    3 Distal tooth 0.3-0.8 mm long; sporocarps 3.5-5.0 mm long; sporocarps 1 or 2(-4) per fertile frond, attached to stipe up to 5 mm above stipe base; common peduncle joining 2 peduncles to stipe, if present then only 1 mm
    3 Distal tooth absent or < 0.2 mm long; sporocarps 4.5-6.0 mm long; sporocarps (1-) 2-5 (-7) per fertile frond, attached to stipe up to 25 mm above stipe base; common peduncle joining 2 or more peduncles to stipe 2-8 mm
  2 Roots present only at the nodes.
      4 Distal tooth absent or a very low bump (< 0.2 mm long); leaf lower surface densely spreading pubescent
      4 Distal tooth 0.4-1.2 mm long, sharply acute to pointed, often hooked; leaf lower surface glabrate to sparsely appressed pubescent