Pine Rose

Rosa pinetorum A. Heller, Muhlenbergia 1: 53. 1904
Stems slender, erect, sparingly branched, 6-8 dm. high, usually armed with numerous bristles and weak prickles, especially below, and stouter infrastipular prickles, which are often 1 cm. long, straight, terete or slightly flattened below; floral branches about 1 dm. long, prickly but rarely bristly; stipules short, adnate, about 1 cm. long, mostly dilated, more or less glandular on the back, conspicuously glandular-ciliolate; rachis and petiole glandular-hispid and sometimes prickly, reddish; leaflets 5-7, orbicular or round-oval, 1-3 cm. long, glabrous or nearly so above, slightly pubescent and sparingly glandular on the veins, more or less double-serrate with gland-tipped teeth; flowers commonly solitary; petioles glabrous, about 2 cm. long; hypanthium globose, glabrous; sepals lanceolate, caudate-attenuate, about 2 cm. long, purplish, glabrous or slightly glandular on the back, villous on the margins and tomentose within; petals deep rose-colored, about 2 cm. long, obcordate; styles distinct, persistent, not exserted.
Type locality: Pacific Grove, California. Distribution: Vicinity of Monterey Bay, California.

Rosa pinetorum is an uncommon species of rose known by the common name pine rose. It is endemic to California, where it occurs in the coniferous forests of the Central Coast Ranges around Monterey Bay.