Rosa pisocarpa subsp. pisocarpa

Rosa rivalis Eastw. Bull. Torrey Club 32: 198. 1905
Stems about 1 m. high, chestnut-brown, terete, glabrous, with a few slender short straight prickles 1-4 mm. long; stipules adnate, about 2 cm. long, narrow or the upper dilated, glabrous, dentate on the margins, the free portion broad, ovate or broadly semi-lunate, incurved; rachis and petiole glabrous or slightly pubescent; leaflets 5-7, usually round-oval, rarely obovate, 2-5 cm. long, coarsely toothed, thin, wholly glabrous or somewhat pubescent on the veins beneath; flowers corymbose, leafy-bracted; pedicels glabrous, 1-2 cm. long; hypanthium glabrous, globose; sepals lanceolate, caudate-attenuate, usually with dilated tips, 1.5-2 cm. long, sparingly glandular on the back, tomentose on the margins and within; petals obcordate, rose-colored, about 2 cm. long; styles distinct, persistent, not exserted.
Type locality: Laytonville, Mendocino County, California. Distribution: Central California to Oregon.