Wild Roses of Saskatchewan How to tell them apart.

Links provided for photograph referencing the four SK wild rose species.

Minnesota Wild Flower has great images of blooms, leaves, fruit. Fruit images especially good for identification after late July

Glen Lee on Saskatchewan Wild Flower has images going into all the rose parts but not the fruit

Woods Rose Rosa woodsii
Wood' Rose https://www.saskwildflower.ca/nat_Rosa-woodsii.html
The only difference between Wood's Rose and Smooth Rose is the pair of prickles just below the wood's rose leaf nodes (infrastipular.) The stem shows broad flattened bases on every bristle. Mainly seen with 7 leaflets. 2-4 blooms at end of stem (can be more) Any shape fruit, mostly globular. Often mixed up with smooth rose.

Prickly Rose Rosa aciclaris
Saskatchewan Data conservation centre gives this as Rosa acicularis ssp. sayi
The tallest of all the prairie roses. 1.2 - 2.5 m (4 - 8 feet) high. Many many prickles on the stem. 5-7 leaflets rarely more. Only one to three flowers at the end of the stem, and usually one deep pink flower only. Most often the rose hip is long, oval and slender not globular Rarely but sometimes Round globular fruit.

Prairie Rose Rosa arkansas
Shortest of all prairie wild roses - low growing 15 to 46 cm high and may bloom after the other roses are finished. Whitish pink flowers. (6 to 18 inches) 9-11 shiny leaflets. 1-4 flowers on end of stem. Round globular fruit.

Note besides the three roses above, the Saskatchewan Conservation Data Centre SCDC also lists
Smooth Rose Rosa blanda
SCDC ranks Smooth rose as S1 Critically Imperiled/ Extremely rare At very high risk of extinction or extirpation due to extreme rarity, very steep declines, high threat level, or other factors.
Not listed on Sk Wildflowers so no link
Branches thornless or almost thornless as in images above.
Upper portions of bush and new growth has no bristles. Usually 7 leaflets. 1-4 blooms at end of stem. Round globular fruit. Often confused with Wood's Rose. The only difference between Wood's Rose and Smooth Rose is the pair of prickles just below the wood's rose leaf nodes (infrastipular.)

Because there are two rose species very similar, one could say that Wood's Rose/Smooth Rose are the most common species on the prairies.

Great to take pictures of the bristles, the numbers of leaflets on a leaf, if there are bristles below leaf nodes, and after the bush stops blooming an image of the fruit.

Posted on July 26, 2021 04:58 PM by saskatoonafforestationareas saskatoonafforestationareas


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