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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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References

For Populus

Eckenwalder, J.E. 1977. North American cottonwoods (Populus, Salicaceae) of sections Abaso and Aigeiros. J. Arnold Arb. 58: 193-208. Google Scholar

Eckenwalder, J.E. 1984. Natural intersectional hybrids between North American species of Populus (Salicaceae) in sections Aigeiros and Tacamahaca. II. Taxonomy. Can. J. Bot. 62: 325-335. Google Scholar

Eckenwalder, J.E. 1996. Systematics and evolution of Populus. In Stettler, R.F., H.D. Bradshaw, Jr., P.E. Heilman, and T.M. Hinckley, eds. Biology of Populus and its implications for management and conservation. NRC Research Press, Ottawa. Google Scholar

Eckenwalder, J.E. 2010. Populus. In Flora of North America Editorial Committee. 2010. Flora of North America north of Mexico. Volume 7, Magnoliophyta: Brassicaceae to Salicaceae. Oxford Univ. Press, New York, NY. 797 pp. Google Scholar

Hamzeh, M., and S. Dayanandan. 2004. Phylogeny of Populus (Salicaceae) based on nucleotide sequences of chloroplast trnT-trnF region and nuclear rDNA. Amer. J. Botany 91: 1398-1408. Google Scholar