70 Rydberg: Notes on Rosaceae 



4. Rosa Brownii Rydberg, sp. nov. 



Stem slender, terete, glabrous, green or brownish, armed with 

 slender straight prickles which are 5-8 mm. long, terete except the 

 expanded depressed base; leaves five- to seven-foliolate; stipules 

 ovate, acute; petiole and rachis finely'pilose and more or less glandu- 

 lar; leaflets thin, 1-3 cm. long,serratewithsomeof the'teeth double, 

 broadly oval, acute at the apex, glabrate above, paler, pilose and 

 slightly glandular-muricate beneath; flowers mostly solitary; 

 pedicels 1-2 cm. long, glabrous; hypanthium globose, glabrous, in 

 fruit about 12 mm. in diameter; sepals lanceolate, caudate-acu- 

 minate, usually with foliaceous tips, about 2 cm. long, glabrate on 

 the back, tomentose and slightly glandular-hispid around the 

 margins, and tomentose within; petals broadly obovate, rose- 

 colored, 1.5-2 cm. long; styles distinct, persistent, not exserted; 

 achenes inserted both on the inside and in the bottom of the 

 hypanthium. 



This species resembles somewhat R. nutkana, but the prickles 

 are weak, not at all flattened, and the petioles, rachis and lower 

 surface of the leaflets decidedly pilose. Much of the Californian 

 material determined as R. nutkana belongs here. 



California: North side of Mt. Shasta, 1897, H. E. Brown 349 

 (type, in the herbarium of the New York Botanical Garden) ; Hum- 

 boldt Bay, 1901, Chandler 1198; Mendecino, 1903, McMurphy 270. 



5. Rosa californica Cham. & Schlecht. Linnaea 2: 35. 1827 



The original R. californica is characterized by its stout, flat, 

 usually curved prickles, corymbose flowers, and its leaflets which 

 are villous on both sides, usually simple-toothed and rarely 

 slightly, if at all, glandular. The hypanthium is usually ovoid with 

 a distinct neck. It is not uncommon throughout California, and 

 two specimens have been seen from Lower California. 



Lower California: San Ysidro Ranch, Mearns 3865 (peculiar 

 form) ; between Tio Juana River and Laguna, Mearns 3504. 



6. Rosa Aldersonii Greene, Pittonia 5: no. 1903 



This species diff'ers from R. californica in the doubly serrate 

 leaflets which are conspicuously glandular-granuliferous and only 

 slightly, if at all, pubescent beneath. The first one to recognize 

 it as different from the typical R. californica wasC A. Meyer, who 



