ROSACEAE, 



X S. Bumalda. 



S. Douglasii. 



S. tomentosa. 



S. salicifolia. 



S. latifolia. 



S. prunifolia. 



S. prunifolia plena. 



X S. multiflora. 



2. Leaves small (scarcely 10 X 30 mm,), nerved. X S. arguta. 

 Leaves distinctly larger, veiny. 3. 



3. Leaves rhombic-lanceolate. X S. cantoniensis,. 

 Leaves not rhombic. 4. 



4. Flowers in flat corymbs, often pink. 

 Flowers in elongated panicles. 5. 



5. Tomentose : flowers pink. 6. 



Stems and foliage glabrous : flowers white. 



6. Fruit glabrous. 

 Fruit pubescent. 



/. Twigs yellow-brown : inflorescence woolly. 

 Twigs reddish-brown : inflorescence glabrate. 



8. Pubescent : leaves ovate, minutely serrulate. 9. 

 Glabrous, ic. 



9. Flowers single. (Bridal Wreath). 

 Flowers double. 



10. Leaves serrate. 

 Leaves often lobed. n. 



11. Leaves very obtuse. S. trilobata. 

 Leaves often rather acute. X S. Vanhouttei. 



NEVIUSIA. Snow Wreath. 



Deciduous small shrubs with slender twigs 3-lined below 

 the nodes; round homogeneous pith; alternate raised small half- 

 round leaf-scars with a single bundle-trace ; no stipule-scars ; 

 sessile ovoid buds with about 8 exposed scales ; rather small 

 petioled leaves ; slender-stalked dioecious apetalous flowers with 

 elongated white stamens, at ends of the branches ; and several 

 somewhat fleshy pubescent akenes to each persistent calyx. 

 Leaves ovate, double serrate. N. alabamensis. 



SORBARIA. 



Deciduous small shrubs with slender terete twigs ; relatively 

 large continuous roundish brownish pith; alternate little raised 

 broadly triangular leaf-scars with 3 bundle-traces; no stipule 

 scars ; ovoid buds somewhat contracted at base, with several 

 scales ; odd pinnate leaves with serrate leaflets ; perfect moder- 



