go ROSACEAE, 
i) 
. 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.. x S. Bumalda. 
Flowers in elongated panicles. 5. 
5. Tomentose: flowers pink. 6, 
Stems and foliage glabrous: flowers white. 7. 
6. Fruit glabrous. S. Douglasii. 
Fruit pubescent. S. tomentosa. 
7. Twigs yellow-brown: inflorescence woolly. S. salicifolia. 
Twigs reddish-brown: inflorescence glabrate. S. latifolia. - 
8. Pubescent: leaves ovate, minutely serrulate. 9. 
Glabrous. Ie. 
9g. Flowers single. (Bridal Wreath). S. prunifolia. 
Flowers double. S. prunifolia plena. 
10. Leaves serrate. x S. multiflora. 
Leaves often lobed. 11. 
11. Leaves very obtuse. S. trilobata. 
Leaves often rather acute. x S. Vanhouttei. 
Neviusi1A. 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- 
