ROSACEAE 55 



4. Flowers in flat corymbs, often pink. X S. Bumalda. 

 Flowers in elongated panicles. 5. 



5. Tomentose below: flowers pink. 6. 



Stems and foliage glabrous: flowers nearly white. 8. 



6. Fruit glabrous. 7. 



Fruit pubescent. (Steeple bush). S. tomentosa. 



7. Leaves acute at both ends. X S. Billardieri. 

 Leaves blunt at both ends. S. Douglasii. 



8. Twigs yellow-brown: inflorescence woolly. S. salicifolia. 

 Twigs reddish-brown: inflorescence glabrate. S. latifolia. 



9. Pubescent: leaves elliptic-ovate, serrulate. 10. 

 Glabrate. 11. 



10. Flowers single. (Bridal wreath). S. prunifolia. 

 Flowers double. S. prunifolia plena. 



11. Leaves serrate. 12. 

 Leaves often lobed. 13. 



12. Leaves ovate. X S. multiflora. 

 Leaves obovate. S. chamaedryfolia. 



13. 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 follicles to each per- 

 sistent calyx. 



Leaves ovate, doubly serrate. N. alabamensis. 



SORBARIA. 



Deciduous small shrubs with slender terete twigs; rela- 

 tively large continuous roundish brownish pith; alternate lit- 

 tle 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 



