Table I.

Summary of percent increases in DMAPP content from predawn to midday

Nonemitting Species	Emitting Species
%	%
Eastern white pine (Pinus strobus) −22	Salix fragilis   110
Common walnut 9	Cowpea    110
Red maple 23	Red oak    143
Common pole bean 42	Cottonwood   149
	Pinus rigida   184
	Ponderosa pine   489
	Gray pine     1,063

Note that data for this summary are given in Figure 2 and represent the average percent increase of three to five individual leaf samples. Both isoprene and MBO emitters are included in the “emitting species” category.