1	"Leaves ternate, with 5 or fewer leaflets"	2
1	"Leaves biternate or triternate, with more than 5 leaflets"	4
2	"Anthers with terminal appendages 1-3 mm long"	"Clematis aristata"
2	"Anthers with terminal appendage up to 0.5 mm long"	3
3	"Achenes often slightly falcate, and often with longitudinal ridges; anthers mostly 1-1.5 mm long"	"Clematis pickeringii"
3	"Achenes not falcate, without any longitudinal ridges; anthers mostly 1.5-2 mm long"	"Clematis glycinoides"
4	"Pedicels glabrous; achenes slightly flattened, 0.9-1.1 mm wide; leaflets usually toothed; upper surface of leaflets with sparse indumentum of +/- appressed hairs up to 0.8 mm long"	"Clematis fawcettii"
4	"Pedicels with dense antrorse hairs; achenes strongly flattened, 1.8-2.3 mm wide; leaflets entire or deeply lobed, not toothed; upper surface of leaflets glabrous or with a few hairs up to 0.3 mm long"	5
5	"Leaves mostly biternate, with 7-12 leaflets"	"Clematis microphylla"
5	"Leaves mostly triternate, with more than 12 leaflets"	"Clematis decipiens"