Solidago ptarmicoides (Nees) B. Boivin - Prairie Goldenrod


 

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Solidago ptarmicoides - (image 1 of 6)

 

Taxonomy

Family: Asteraceae

 

Synonyms include Aster ptarmicoides (Nees) Torr. & A. Gray, Oligoneuron album (Nutt.) G.L. Nesom and Unamia ptarmicoides (Nees) Greene. Can hybridize with other species of Solidago.  

Habitat

Prairies and other dry, open places. Prefers sandy or gravelly, calcareous soil.

Associates

 

 Distribution

VT, NY, and western Quebec south to GA, west to Saskatchewan, CO, and AR.

Morphology

Herbaceous perennial to 0.7 m. Leaves firm and coriaceous (leathery), glabrous or scabrous, entire or with a few projecting teeth, usually 3-nerved; lower leaves tend to be larger, linear to narrowly lanceolate and petiolate, persistent; upper leaves gradually reduced and becoming sessile. Heads 3-60 in open flat or flattish-topped, corymbiform inflorescences; involucral bracts glabrous, imbricate, firm, often with a strongly thickened midrib; ray white, 5-9 mm; disk flowers whitish, numerous; pappus bristles clavellate-thickened and subplumose towards the tip. 

Notes

Flowers mid June to early October

Wetland indicator: Facultative

Could easily be mistaken for an Aster due to the large, white ray petals. The clavate (club-like) pappus bristles are a good diagnostic feature. Most other Goldenrods have smaller rays that are yellow. Solidago bicolor L. is the only other species with white flowers in our area. Endangered in several states.

References

Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. Second Ed.
The New York Botanical Garden. Bronx, NY

 

Swink, F. and G. Wilhelm. 1994. Plants of the Chicago Region.
Indiana Academy of Science. The Morton Arboretum. Lisle, Illinois.

 

USDA, NRCS. 2002. The PLANTS Database, Version 3.5 (http://plants.usda.gov).
National Plant Data Center, Baton Rouge, LA 70874-4490 USA.

 


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 Michael Hough 2009