162 



Rydberg: Notes on Rosaceae 



Leaves very thin, pale and slightly 

 glandular-puberulent, but not muri- 

 culate beneath. 12. R. Nutkana. 



Leaves thicker, dark green on both sides, 

 conspicuously glandular-muricate be- 

 neath. 13. R. muriculata. 

 Leaflets simple-toothed, puberulent beneath, 

 but not glandular-granuliferous or -muricate; 



rachis rarely glandular. 14. R. Spaldingii. 



Prickles more or less curved. 



Prickles very large, flat, pubescent; twigs densely 



glandular and pubescent. 15- R- Durandii. 



Prickles slender, glabrous, not conspicuously 

 flattened; twigs not conspicuously glandular, 

 mostly glabrous. 

 Sepals not glandular-hispid; leaflets 2-4 cm. 

 long, not conspicuously glandular double- 

 toothed. 16. R. Columbiana. 

 Sepals conspicuously glandular-hispid; leaflets 

 1-2 cm. long, conspicuously glandular double- 

 toothed. 17- R- myriadenia. 

 Flowers mostly corymbose, if solitary the petals 2 cm. 

 long or less; fruit rarely more than 1 cm. in diameter. 

 Prickles more or less curved. 



Leaflets softly villous beneath; prickles stout, 



flattened; hypanthium with a neck. 18. R. califomica. 



Leaflets very finely puberulent and somewhat 



glandular-pruinose beneath; prickles not 



flattened; hypanthium without a distinct 



neck. 



Leaflets with simple teeth, not copiously 



glandular-pruinose beneath. 19. R. puberulenta. 



Leaflets with double gland-tipped teeth, con- 

 spicuously glandular-puberulent beneath. 20. R. delitescens. 

 Prickles straight or nearly so. 



Hypanthium normally neither prickly or bristly. 

 Hypanthium globose; neck usually obsolete. 

 Sepals lanceolate, with long, caudate- 

 attenuate or sometimes foliaceous 

 tips, more than 1 cm. long. 

 Stipules, petiole, and rachis copiously 

 glandular; leaflets double-toothed, 

 with gland-tipped teeth, densely 

 glandular-pruinose or muriculate 

 beneath. 

 Leaflets orbicular or rounded oval. 13. R. muriculata. 

 Leaflets oblong to oval. 22. R. Fendleri. 



Stipules, petiole, and rachis not glan- 

 dular or the stipules slightly glan- 

 dular-dentate. 



