Rydberg: Notes on Rosaceae 



163 





Leaflets glabrous or nearly so. 



Leaflets broadly oval, 3-5 cm. 



long. 

 Leaflets obovate or elliptic, rarely 

 3 cm. long. 

 Leaflets more or less pubescent be- 

 neath. 

 Leaflets villous or pilose beneath, 



rounded or broadly oval. 

 Leaflets finely puberulent be- 

 neath. 

 Leaves obovate, more or less 

 pale or glaucous beneath; 

 prickles comparatively long, 

 spreading. 

 Leaflets elliptic or oval, 

 equally green on both 

 sides; plant with few 

 short ascending prickles. 

 Sepals decidedly glandular; 



leaflets thin and soft. 

 Sepals not glandular, or 

 slightly so on the mar- 

 gins; leaflets rather thick. 

 Sepals ovate, less than 1 cm. long, not con- 

 spicuously caudate; leaflets simple-toothed; 

 puberulent beneath. 

 Hypanthium elongate with a distinct neck; 

 leaves finely puberulent beneath. 

 Leaflets light green, coarsely toothed; hy- 

 panthium in fruit pyriform. 

 Leaflets dark green above, finely toothed; 

 hypanthium in fruit ellipsoid. 

 Plant unarmed or nearly so; fruit 1 mm. 



broad. 

 Plant with slender prickles; fruit 6-8 mm. 

 broad. 

 Hypanthium densely bristly or prickly; leaflets 

 orbicular in outline. 

 Leaflets subsessile. 

 Leaflets with petiolules, 1-4 mm. long. 



21. R. rivalis. 

 23. R. Woodsii. 



25. R. myriantha. 



24. R. Maconnii. 



26. R. pisocarpa. 



27. R. ultramonlana. 



28. R. Covillei. 



31. R. pyrifera. 



32. R. Pringlei. 



33. R. Eastwoodiae. 



29. R. spithamea. 



30. R. adenocarpa. 



5. Rosa collaris Rydberg 



The following specimens are doubtfully referred to this species: 

 Washington: Fort Colville, 1880, S. Watson 121. 



