Rosa acicularis, the Bristly Rose, has a wider distribution than any other Rosa species. From Europe to Asia across the islands of Japan to North America, rightly it's called the Circumpolar Rose. Within that broad range, Washington University botanist Walter Hepworth Lewis recognized two subspecies, a Eurasian octoploid (2n=56) named subsp. acicularis and a North American hexaploid (2n=42) named subsp. sayi. Rosa sayi was named for the American naturalist, Thomas Say. Photographed April 23, 2020 at "Rose Woods.
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Rosa acicularis, the Bristly Rose, has a wider distribution than any other Rosa species. From Europe to Asia across the islands of Japan to North America, rightly it's called the Circumpolar Rose. Within that broad range, Washington University botanist Walter Hepworth Lewis recognized two subspecies, a Eurasian octoploid (2n=56) named subsp. acicularis and a North American hexaploid (2n=42) named subsp. sayi. Rosa sayi was named for the American naturalist, Thomas Say. Photographed April 23, 2020 at "Rose Woods.