Synonyms: Rosa acicularis f. plena; Rosa acicularis var. bourgeauiana; Rosa acicularis var. cucurbiformis; Rosa acicularis var. engelmannii; Rosa acicularis var. lacorum; Rosa acicularis var. lacuum; Rosa acicularis var. rotunda; Rosa acicularis var. sayi (homotypic); Rosa acicularis var. sayiana; Rosa aciculata; Rosa blanda var. aciculata; Rosa bourgeauiana; Rosa butleri; Rosa collaris; Rosa engelmannii; Rosa engelmannii britannicae-columbiae; Rosa engelmannii occidentalis; Rosa sayi (homotypic); Rosa stricta; Rosa suavis var. engelmannii (homotypic)