(1944)  Page(s) 462.  Includes photo(s).
 
Rosa Aldersonii Greene. Alderson's Rose. Fig. 2508.
Rosa californica var. Petersiana C. A. Mey. Zimmtr. 19. 1847.
Rosa californica var. glandulosa Crepin, Bull. Soc. Bot. Belg. 15: 52. 1876.
Rosa Aldersonii Greene, Pittonia 5: 110. 1903.
Rosa Breweri Greene, Leaflets Bot. Obs. 2: 262. 1912.

Stems armed with stout recurved prickles. Leaves 5-9-foliolate, pilose and glandular-pubescent throughout ; leaflets broadly oval, obtuse, 15-30 mm. long, more or less doubly serrate with gland-tipped teeth ; pedicels pilose and glandular ; flowers in few- to several-flowered cymes; sepals pilose and glandular; petals 15-20 mm. long; fruit 8-10 mm. thick, globose or ovoid and short-beaked, glabrous or sparsely pilose toward the base.
Hillsides and thickets. Upper Sonoran Zone; central California to northern Lower California. Type locality: Witch Creek, San Diego County, California. April-Aug.
This species and californica, as here treated, constitute two extremely variable groups. A number of segregates have been proposed based largely upon pubescence, the shape of the prickles, and the absence or presence of a neck on the fruit.
 

(1944)  Page(s) 465.  Includes photo(s).
 
Rosa Bridgesii Crépin. Bridges' Rose. Fig. 2519.
Rosa Bridgesii Crepin, Bull. Soc. Bot. Belg. 15: 54. 1876.
Rosa gymnocarpa var. pubescent S. Wats. Bot. Calif. 1: 187. 1876.
Rosa crenulata Greene, Leaflets Bot. Obs. 2: 255. 1912.
Rosa oligocarpa Rydb. N. Amer. Fl. 22: 532. 1918.

Stems slender, low and spreading, 2-10 cm. high, armed with straight or slightly curved infrastipular prickles, the floral branches often unarmed. Stipules glandular-ciliate; petioles with gland-tipped teeth, finely pubescent on both surfaces; flowers mostly solitary; pedicels glabrous or somewhat glandular-hispid; hypanthium glabrous, globose, 6-7 mm. broad in fruit; sepals ovate, acuminate, about 8 mm. long, deciduous with the styles. Open pine forest, Arid Transition Zone; southern Oregon to the southern Sierra Nevada, California. Type locality: California. June-July.

(1944)  Page(s) 462.  Includes photo(s).
 
Rosa californica Cham. & Sch. California Rose. Fig.. 2509.
Rosa californica Cham. & Sch. Linnaea 2: 35. 1827.
Rosa californica var. pubescens Crepin, Bull. Soc. Bot. Belg. 15: 52. 1876.
Rosa Hartwegiana Crepin, Bull. Soc. Bot. Belg. 15: 52, as a synonym. 1876.

A variable species, the typical form with stems erect, much branched, light brown or yellowish, 1-3 m. high, armed with stout flattened recurved prickles, the young shoots usually bristly. Leaves 5-7-foliolate, oval, 1-2 cm. long, usually simply serrate, teeth without glands, dull green and more or less appressed-pubescent above, villous and sometimes slightly glandular beneath ; pedicels glabrous or somewhat villous ; hypanthium glabrous or rarely sparsely villous, globose or subglobose with a distinct neck, 10-15 mm. broad in fruit; sepals lanceolate, caudate-attenuate, entire, villous and rarely glandular on the margins.
Low ground or moist slopes, often forming thickets, Upper Sonoran and Transition Zones; southern Oregon to northern Lower California. Type locality: San Francisco, California. May-Sept.

(1944)  Page(s) 463.  
 
Rosa Covillei Greene, Leaflets Bot. Obs. 2: 262. 1912. Stems less than 1 m. high, glaucescent, bristly and with weak straight infrastipular prickles. Stipules narrow, glandular-ciliate; petioles and rachis more or less glandular; leaflets 7, oval or obovate, 15-20 mm. long, serrate, glabrous above, puberulent beneath; flowers solitary; pedicels glabrate; hypanthium glabrous, round-ovoid, contracted into a neck, 1.5 mm. broad in fruit; sepals ovate, short-acuminate, about 1 cm. long. Originally collected in the yellow pine forests south of Naylox, Klamath County, Oregon. Perhaps only a local variation of Rosa Macounii Greene.
 

(2018)  Page(s) 459.  
 
Rosa Durandii Crepin, Bull. Soc. Bot. Fr. 22: 19. 1875. Stems erect, 2-3 m. high, brown, with stout flat curved prickles, about 15 mm. long, the branches pubescent and densely glandular-hispid. Leaves 5-9-foliolate; petioles unarmed, pubescent and very glandular; leaflets broadly oval, glabrous above, densely glandular-granuliferous beneath, double-toothed with gland-tipped teeth; hypanthium glabrous or glandular at base, globose, in fruit 12—15 mm. broad- sepals broadly lanceolate, caudate-attenuate, entire, glandular on the back. A little-known species, Queen Charlotte Island, Davidson 8144, and Oregon, Elihu Hall 146. Type locality: Oregon, without definite locality.
 

(1944)  Page(s) 465.  Includes photo(s).
 
Rosa gymnocarpa Nutt. Wood Rose. Fig. 2518.
Rosa gymnocarpa Nutt. ex Torr. & Gray, Fl. N. Amer. 1 : 461. 1840.

Stems slender, erect, 1-3 m. high, often very bristly and with slender infrastipular prickles, the floral branches often unarmed. Stipules narrow, glandular-ciliate and usually dentate; petioles and rachis usually glandular-hispid ; leaflets 5-9, suborbicular to elliptic, 1-3 cm. long, thin, glabrous on both surfaces, doubly serrate with gland-tipped teeth ; flowers usually solitary ; hypanthium ellipsoid, in fruit 4-6 mm. broad; sepals ovate, acuminate, glabrous on the back, deciduous with the styles.
In shady woods, chiefly Humid Transition Zone; British Columbia to Montana and central California. Type locality: in shady woods, Oregon. May-July. Bald-hip Rose.
Greene (Leaflets Bot. Obs. 2: 255-266. 1912) has described ten segregates of this species based on minor vegetative variations.

(1944)  Page(s) 462.  Includes photo(s).
 
Rosa Macdougalii Holz. MacDougal's Rose. Fig. 2507.
Rosa nutkana var. hispida Fernald, Bot. Gaz. 19: 335. 1894.
Rosa Macdougalii Holz. Bot. Gaz. 21 : 36. 1896.
Rosa nutkana Macdougalii Piper, Contr. U.S. Nat. Herb. 11: 335. 1906.

Stems erect, 1-2 m. high, armed with straight infrastipular prickles, the floral branches with weaker prickles or unarmed. Leaves 7-foliolate; stipules more or less glandular-toothed; petioles and rachis puberulent and slightly glandular ; leaflets oval, 1 . 5-5 cm. long, glabrous or nearly so above, puberulent or slightly glandular beneath ; flowers solitary or rarely corymbose ; pedicels glandular-bristly; hypanthium subglobose, densely bristly or prickly, 12-18 mm. thick in fruit ; sepals glandular on the back, caudate-attenuate.
Arid Transition Zone; British Columbia and eastern Washington to northern Utah. Type locality: Farmington, Idaho. May-July.

(1944)  Page(s) 463.  Includes photo(s).
 
Rosa mohavensis Parish. Mojave Rose. Fig. 2515.
Rosa californica var. glabrata Parish, Erythea 6: 88. 1898.
Rosa mohavensis Parish, Bull. S. Calif. Acad. 1 : 87. 1902.
Rosa Woodsii var. mohavensis Jepson, Fl. Calif. 2: 210. 1936.

Plant glabrous throughout; stems slender, 5-10 dm. high, armed with nearly straight scattered prickles flattened at base; floral branches short, more or less prickly. Stipules mostly entire ; petioles and rachis occasionally with a few prickles ; leaflets generally 5, oval to elliptic, 5—15 mm. long, serrate ; flowers solitary, rarely 2 or 3 ; hypanthium globose ; sepals caudate-attenuate, about 10 mm. long ; petals about 15 mm. long.
Moist places, Upper Sonoran Zone; borders of the Mojave Desert, southern California. Type locality: Cushenberry Springs, on the desert slopes of the San Bernardino Mountains, California. May-July.

 

(1944)  Page(s) 459.  Includes photo(s).
 
Rosa myriadènia Greene. Glandular Rose. Fig. 2505.
Rosa myriadenia Greene, Leaflets Bot. Obs. 2: 263. 1912.
Stems low, with spreading branches, armed with slender terete distinctly curved infrastipular prickles. Leaves 5-foliolate; stipules broad, densely glandular and slightly prickly; leaflets oval, 1-2 cm long, doubly serrate, with gland-tipped teeth, dark green and glabrous above, densely pilose beneath and glandular on the veins; flowers 1-3; pedicels glabrous; hypanthium globose, with a short neck; sepals caudate-attenuate, glandular-hispid and sometimes prickly on the back.
Transition Zone; southern Oregon, west of the Cascade mountains. Type locality: Huckleberry Mountain, Jackson County, Oregon. May-July.

(1944)  Page(s) 459.  
 
Rosa nutkana Presl. Nootka Rose. Fig. 2503.
Rosa nutkana Presl, Epimel. Bot. 203. 1851.
Rosa anacantha Greene, Leaflets Bot. Obs. 2: 265. 1912.
Rosa columbiana Rydb. N. Amer. Fl. 22: 514. 1918.

Stems stout, erect, 0.5-1.5 m. high, usually armed with large paired straight or somewhat curved prickles, the floral branches glabrous or nearly so. Stipules 1-2 cm. long, more or less glandular-dentate ; petioles and rachis more or less puberulent or short-pubescent and often with interspersed stalked glands; leaflets usually 7, 1.5-5 cm. long, broadly ovate, rounded at both ends or acute at apex, doubly serrate, with glandular teeth, dark green and glabrous above, paler and somewhat glandular-puberulent or slightly pubescent on the veins beneath; flowers usually solitary; pedicels glabrous or sometimes glandular-hispid; hypanthium glabrous; sepals lanceolate, 2-3 cm. long, cordate-acuminate, often with foliaceous entire appendages, glabrous or rarely glandular on the back ; petals 25-35 mm. long, broadly obcordate ; hypanthium globose, 15-18 mm. broad in fruit.
Canadian and Transition Zones; Alaska to Wyoming and northern California. Type locality: Nootka Sound, British Columbia. May-July.