Not to be semantically confused with : Canadian Fleabane (Erigeron bonariensis) [a plant of similar name belonging to the same family but differing Genera] nor to
Canadian Waterweed (Elodea canadensis).
Easily mistaken for : garden varieties of Canadian Goldenrod.
Easily mis-identified as :
Early Goldenrod (Solidago gigantea) is usually taller at up to 2.5m (but can be as short as 0.5m) and has more or less hairless leaves except sometimes on the veins underneath the leaf, and it has between 6 and 10 (12) disc florets whereas Canadian Goldenrod has between only 2 to 8.
Rough-stemmed Goldenrod (Solidago rugosa) which has between 3 and 8 disc florets and presumably a rough stem, but it does not occur on the Sefton Coast.
Hybridises with : Goldenrod (Solidago virgaurea) to produce the sterile Silidago × niederederi but that appears to be extinct not seen since 1999 and even then only in four hectads nowhere near the Sefton Coast.
There are two sub-species with only slight variations between them:
The sub-species of Canadian Goldenrods from North American are numerous and difficult to differentiate between, and may, or may not have given rise to the British sub-species with some possibly being cultivars or hybrids that have arisen in the UK, particularly in regard to
- (Solidago canadensis ssp. canadensis)
- (Solidago canadensis ssp. altissima)
Early Goldenrod and
Disc florets number between 2 and 8 (whereas Early Goldenrod has between 6 and 10 (12) disc florets, so it cannot be that).
Grass-leaved Goldenrod (Solidago graminifolia) is more like Goldenrod with just a single spike of flowers which is flat-topped but it has much narrower leaves than does Goldenrod.
Inhabits waysides and waste ground, spreading in great clones by underground rhizomes. Only one or two specimens were recorded at Nob End in 1978, but by 2010 the population had covered several dozen square metres.
Three colours of dye, mustard, orange and brown, can be extracted from the whole plant.
It is poisonous containing some pyrrolizidine alkaloids,