Geum × catlingii

Catling's avens
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Rosales
Family:	Rosaceae
Genus:	Geum
Species:	G. × catlingii
Binomial name
	Geum × catlingii; J.-P. Bernard & R. Gauthier

Geum × catlingii, or Catling's avens, is a plant in the rose family, Rosaceae. It is known from eastern Canada, where it arises from natural hybridization between the native G. canadense Jacq. and the introduced G. urbanum L.[1][2] It is named after Paul M. Catling, the botanist who first observed the hybrid.

Geum ×catlingii (centre), with parents G. canadense (top right), and G. urbanum (bottom centre)

Description

Geum ×catlingii is a hybrid taxon, and as such exhibits variable morphology. However, several characters in combination help distinguish it from other Geum species:[1]

Hybrid vigor - hybrids tend to be larger than parents
Petals are creamy-yellow - intermediate between dark yellow (G. urbanum) and white (G. canadense).
Intermediate stem bract size
Highly sterile ovaries

It has been noted to bloom throughout the summer, after other species have shed their petals.[3]

gollark: I mean, you can get it from a circle; tau is the *radius*/circumference ratio.

gollark: There are formulae for both, IIRC.

gollark: Yes you can.

gollark: https://tauday.com/

gollark: It is superior to the foolish "pi", because radians.

References

Bernard, J.-P.; Gauthier, R. (1986). "Observations sur le Geum urbanum L. dans la région de Québec et description de deux hybrides" (PDF). Naturaliste Canadien. 113 (4): 317–324.
Brouillet, L.; Coursol, F.; Meades, S.J.; Favreau, M.; Anions, M.; Bélisle, P.; Desmet, P. (2010). "VASCAN, the Database of Vascular Plants of Canada". Retrieved 2018-01-12.
Rothfels, C.J. (2005). "Significant 2004 Hamilton Study Area Plant Records from the Royal Botanical Gardens Herbarium (HAM)" (PDF). The Wood Duck. 58 (9): 219–223.

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[Bernard86-1] Bernard, J.-P.; Gauthier, R. (1986). "Observations sur le Geum urbanum L. dans la région de Québec et description de deux hybrides" (PDF). Naturaliste Canadien. 113 (4): 317–324.

[2] Brouillet, L.; Coursol, F.; Meades, S.J.; Favreau, M.; Anions, M.; Bélisle, P.; Desmet, P. (2010). "VASCAN, the Database of Vascular Plants of Canada". Retrieved 2018-01-12.

[3] Rothfels, C.J. (2005). "Significant 2004 Hamilton Study Area Plant Records from the Royal Botanical Gardens Herbarium (HAM)" (PDF). The Wood Duck. 58 (9): 219–223.