ROSACEAE: Rose Family
KEY TO SPECIES OF SPIRAEA
1. Leaf blade narrowly elliptic or narrowly lanceolate, most under 5 mm across, ca 5-7 X as long as wide .............................. S. thunbergii
1. Leaf blade of wider shapes, over 5 mm across, 4 X or less as long as wide ..................................... 2
2. Leaf blade mostly 80-120 mm, apex acuminate .......... S. japonica
2. Leaf blade mostly 70 mm or less, apex acute to obtuse, rarely some short-acuminate ..................................... 3
3. Leaf blade obviously widest beyond middle; most blades with ca 7-8 teeth on each edge, all occurring on upper 1/3 of margin, all pointed apically ............................... S. × vanhouttei
3. Leaf blade mostly widest near middle or below, uncommonly oblanceolate; most blades with 12 or more teeth on each edge ..... 4
4. Leaf blade less than 2 X as long as wide, base widely acute to rounded or barely cordate .................. S. prunifolia
4. Leaf blade more than 2 X as long as …………….. S. cantoniensis