ROSE FAMILY 463 



11. Rosa gratissima Greene. Tehachapi Rose. Fig. 2512. 



Rosa gratissima Greene, Fl. Fran. 73. 1891. 



Stems much branched, 1-2 m. high, densely armed with straight stramineous prickles and 

 bristles, the larger often infrastipular. Stipules puberulent, entire or dentate, not glandular; 

 leaflets 5-7, oval, 1-3 cm. long, glabrous above, puberulent beneath; flowers corymbose; pedicels 

 glabrous or pruinose, sometimes slightly prickly; hypanthium glabrous, globose, about 8 mm. 

 broad in fruit ; sepals glabrous on the back. 



Moist ground, mainly Arid Transition Zone; central Sierra Nevada, mainly eastern slope, to southern Cali- 

 fornia. Type locality: mountains of Kern County, California. April- Aug. 



12. Rosa Macounii Greene. Macoun's Rose. Fig. 2513. 



Rosa Woodsii Lindl. Bot. Reg. 12: pi. 976. 1826. Not Lindl. 1820. 

 Rosa Macounii Greene, Pittonia 4: 10. 1899. 



Stems 0.5-2 m. high, much branched, usually armed with straight terete prickles, the young 

 shoots bristly; floral branches often unarmed. Stipules glandular-denticulate or entire, puberu- 

 lent on the back ; petioles and rachis puberulent ; leaflets 5-7, obovate, cuneate at base, 1-3 cm. 

 long, serrate, green and glabrous above, pale and puberulent beneath ; flowers solitary or in few- 

 flowered corymbs; pedicels glabrous; hypanthium globose, smooth, 8-10 mm. broad in fruit; 

 sepals glabrous or sparingly puberulent on the back. 



Moist ground, mainly Arid Transition Zone; British Columbia and Saskatchewan to eastern Oregon, Ne- 

 braska, and western Texas. Type locality: Assiniboia. June-July. 



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. 



13. Rosa rivalis Eastw. Brook Rose. Fig. 2514. 



Rosa rivalis Eastw. Bull. Torrey Club 32: 198. 1905. 



Stems about 1 m. high, glabrous, armed with scattering slender straight prickles. Stipules 

 glabrous ; rachis and petioles glabrous or slightly pubescent ; leaflets 5-7, broadly oval, 2-5 cm. 

 long, coarsely toothed, thin, glabrous or sparsely pubescent on the veins beneath; flowers 

 corymbose; hypanthium globose; sepals 1.5-2 cm. long, usually with dilated tips, sparingly 

 glandular on the back; petals about 2 cm. long. 



Transition Zone; southern Oregon to central California. Type locality: Laytonville, Mendocino County, 

 California. June-July. 



14. 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 scat- 

 tered 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. 



15. Rosa spithamaea S. Wats. Ground Rose. Fig. 2516. 



Rosa spithamaea S. Wats. Bot. Calif. 2: 444. 1880. 

 Rosa adenocarpa Greene, Leaflets Bot. Obs. 2: 261. 1912. 



Stems low, 1-3 dm. high, from creeping rootstocks, armed with straight, terete, infrastipular 

 prickles and often also bristly. Stipules glandular-ciliate and slightly glandular on the back; 

 petioles and rachis glandular and often with a few prickles ; leaflets usually 5, oval to sub- 

 orbicular, 1-3 . 5 cm. long, doubly serrate with gland-tipped teeth, sparingly pubescent or 

 glabrate above, glandular-pruinose beneath; flowers corymbose or sometimes solitary; pedicels 

 glandular-hispid ; hypanthium ellipsoid or subglobose, densely glandular-hispid, 7-8 mm. broad in 

 fruit ; sepals densely glandular-hispid on the back. 



Open forests, Arid Transition Zone; southwestern Oregon and northwestern California. Type locality: 

 Trinity River, California. June-Aug. 



16. Rosa sonomensis Greene. Sonoma Rose. Fig. 2517. 



Rosa sonomensis Greene, Fl. Fran. 72. 1897. 



Rosa spithamaea var. sonomensis Jepson, Fl. W. Mid. Calif. 279. 1901. 



Rosa granulata Greene, Leaflets Bot. Obs. 2: 262. 1912. 



Plants much resembling Rosa spithamaea in size and general habit, differing chiefly in the 

 leaflets which are broadly oval to orbicular, 5-15 mm. long, doubly serrate with glandular 

 teeth, glabrous on both surfaces, firm and somewhat glaucous. 



Local on high mountain ridges, Upper Sonoran and Arid Transition Zones; Sonoma and Marin Counties to 

 San Luis Obispo County, California. Type locality: Petrified Forest, Sonoma County. May- Aug. 



