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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 Parietaria

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1 Main lateral veins diverging from the midvein above the usually narrowly cuneate leaf base; larger leaves 2-5× as long as wide; achene 0.9-1.2 mm long
  2 Perennial; achenes dark brown, with an acute apex and lacking a mucro; tepals 2.0-3.5 mm long, longer than the involucral bracts (1.5-2.5 mm long); [exotic weed]; [subgenus Parietaria]
  2 Annual; achenes light brown, the apex rounded but with an apical mucro; tepals 1.5-2.0 mm long, shorter than the involucral bracts (1.8-5.0 mm long); [native, sometimes weedy]; [subgenus Freirea].
1 Main lateral veins diverging from the midvein at the usually truncate, rounded, or broadly cuneate leaf base; larger leaves 1-2× as long as wide; achene either 0.6-0.9 or 1.0-1.4 mm long.
    3 Achene 0.6-0.9 mm long, with a flanged stipe, the mucro located symmetrically at the pole of the achene; leaf blades 0.7-2.7 cm long
    3 Achene 1.0-1.4 mm long, without a flanged stipe, the mucro located asymmetrically; leaf blades 1.0-6.5 cm long