KEY TO THE SPIREAS 155 



erect ; stamens longer than the round petals. Cbenate Spirea 

 (211) — Spiraea oren^ta. 



C. Leaves |-1| inches long and almost as broad as long, smooth 

 dark green above and bluish green below, thick and almost ever- 

 green; tall, to 8 feet with spreading branches. Round-leaved 

 Spikea (212) — Spirsea bracteiita. 



B. Margin of leaves decidedly notched and surface smooth on both 

 sides ; stamens not longer than the petals. (D.) 



D. Leaves |-1| inches long, broad ovate and feather-veined ; hardy 

 only South ; petals about as long as stamens. Blhme's Spirea 

 — Spiraea Bliimei. 



D. Leaves J-l| inches long, 3-5-ribbed f rom base and often 3-lobed 



at tip ; shrub to 4 feet with spreading branches ; common. 



Three-lobed Spirea (213) — Spiraea trilob^ta. 

 D. Leaves |-1| inches long ; petals twice the length of the stamens'; 



to 6 feet with arching branches; common. Van Houtte's 



Spirea (214) — Spiraea Van Hotittei. 



D. Leaves decidedly 'more elongated, 1-2 J inches long, dark green 

 above and bluish green below ; handsome and common South 

 but not fully hardy North, growing to the height of 4 feet with 

 arching branches ; flowers larger in dense clusters, often double 

 (var, fibre plfeno). Lance-leaved Spirea (215) — Spiraea 

 cantoni^nsis (S. lanceol^ta, S. ReevesiJina) . 



B. Margin of leaves decidedly notched and surface pubescent, espe- 

 cially below; stamens not longer than the petals. (B.) 



E. Flowers and seed-pods also pubescent ; hardy only South. (F.) 

 F. Lowersideofleavescoveredwithgrayishhairs. SpiraeabUnda. 

 F. Lower side of leaves covered with yellowish hairs. Chinese 



Spirea — Spiraea chin^nsis. 

 B. Flowers and seed-pods smooth ; shrub to 6 feet with slender 

 arching branches ; hardy and frequent North. Downt-leaved 

 Spirea (216) — Spiraea pubfecens. 

 B. Margin of leaves serrate or doubly serrate ; stamens longer than 

 the petals ; calyx reflexed. (G.) 

 G. Upright shrub to five feet with round and usually smooth 

 branches ; leaves slightly notched near tip, 1-2J inches long. 

 Intermediate Spirea (217) — Spiraea mfedia. 

 G. Shrub to 6 feet with smooth but angular branches ; leaves de- 

 cidedly notched, 2-3 inches long. Germander-leaved Spirea 

 (218) — Spiraea chamaedryfblia. 

 * White or pink flowers in broad and flat compound clusters at the 

 tips of the branches, blooming in June and later, some as late as 

 August. (H.) 



