1	"Involucres 1.5-2.6 mm long; pappuses 1.2-2.1 mm long"	"Conyza stricta"
1	"Involucres more than (3-)4 mm long; pappuses more than 2.5 mm long"	2
2	"Marginal florets more than 100"	3
2	"Marginal florets 30-50"	4
3	"Plants perennial; central florets more than 10"	"Conyza hochstetteria"
3	"Plants annual or biennial; central florets fewer than 10"	"Conyza aegyptiaca"
4	"Leaves scabrous or pubescent but not white on the lower surface; heads in dense corymbs"	"Conyza pyrrhopappa"
4	"Leaves white-lanate or cobwebby-hairy on the lower surface; heads few"	"Conyza pedunculata"