462 ROSACEAE 



6. 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: Farming- 

 ton, Idaho. May-July. 



7. Rosa Aldersdnii 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 Brezveri 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 segre- 

 gates have been proposed based largely upon pubescence, the shape of the prickles, and the absence or presence 

 of a neck on the fruit. 



8. 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 yellow- 

 ish, 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-atten- 

 uate, 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. 



9. Rosa pisocarpa A. Gray. Mortar or Cluster Rose. Fig. 2510. 



Rosa pisocarpa A. Gray, Proc. Amer. Acad. 8: 382. 1872. 

 Rosa Copelandii Greene, Leaflets Bot. Obs. 2: 264. 1912. 

 Rosa Pringlei Rydb. Bull. Torrey Club 44: 79. 1917. 

 Rosa Eastwoodiae Rydb. N. Amer. Fl. 22: 527. 1918. 



Stems slender, 1-2 m. high, armed with weak infrastipular prickles, the floral branches 

 sometimes unarmed. Stipules densely short-pubescent, slightly glandular-dentate ; leaflets usually 

 7, 1-4 cm. long, glabrous above, densely puberulent beneath ; flowers corymbose ; pedicels 

 glabrous ; hypanthium smooth, globose, about 8 mm. broad in fruit ; sepals caudate-attenuate, 

 often foliaceous, glandular-hispid on the back. 



In moist places, Transition Zone; British Columbia to Idaho and northern California. Type locality: Oregon. 

 May-Aug. 



In the northern Sierra Nevada and the Siskiyou Mountains are a series of forms that seem to show hybridi- 

 zation or intergradation between the southern R. californica, the northwestern R. pisocarpa, and the interior or 

 Great Basin R. ultramontana. 



10. Rosa ultramontana (S. Wats.) Heller. Interior Rose. Fig. 2511. 



Rosa californica var. ultramontana S. Wats. Bot. Calif. 1 : 187. 1876. 



Rosa ultramontana Heller, Muhlenbergia 1: 107. 1904. 



Rosa Woodsii var. ultramontana Jepson, Fl. Calif. 2: 210. 1936. 



Stems rather stout, 1-3 m. high, armed with straight prickles, the floral branches often 

 unarmed and over-topped by long sterile shoots. Stipules puberulent and often denticulate; 

 leaflets normally 7, 2-4 cm. long, oval, coarsely serrate, dull green on both surfaces, glabrous 

 above, puberulent and often pruinose beneath ; flowers corymbose ; pedicels glabrous ; hypan- 

 thium glabrous, globose, 8-10 mm. broad in fruit; sepals glabrous or slightly puberulent but not 

 glandular-hispid on the back. 



Moist places, Arid Transition Zone; British Columbia to Montana, Nevada, and northern California, east 

 of the Sierra Nevada. Type locality: eastern side of the Sierra Nevada, California. June- Aug. 



