1	"Leaves palmately lobed to palmately compound with up to 7 lobes or leaflets"	2
1	"Leaves simple, entire, toothed, pinnately lobed or hastate, neither palmately lobed nor compound"	7
2	"Leaves palmately lobed to near the base but not palmately compound; leaflets 3–7"	3
2	"Leaves palmately compound with 3–5 leaflets"	4
3	"Plant hairy; leaf lobes coarsely dentate to irregularly pinnately lobed; corolla white with a rose to purple throat, 3–4.5 cm long"	"Merremia dissecta"
3	"Plant glabrous; leaf lobes entire; corolla yellow, 5–6 cm long"	"Merremia tuberosa"
4	"Peduncles glandular in the upper part, sometimes mixed with spreading hairs; sepals at flowering 3–8 mm long; corolla to 2.5 cm long"	"Merremia quinquefolia"
4	"Peduncles glabrous or hairy, but not glandular; sepals longer, 7.5–25 mm long; corolla 2.5–5 cm long"	5
5	"Leaflets 3, outer leaflets with a secondary lobe, so appearing 5, leaflets undulate to occasionally toothed; sepals glabrous, 12–15 mm long, sub- equal, acute"	"Merremia kimberleyensis"
5	"Leaflets 5, entire"	6
6	"Outer sepals glabrous, 7–10 mm long, obtuse, much shorter than the inner; corolla 3–5 cm long"	"Merremia quinata"
6	"Outer sepals patently hirsute, 12–25 mm long, acute or acuminate, slightly longer than the inner; corolla 2–3.5 cm long"	"Merremia aegyptia"
7	"Leaves peltate"	"Merremia peltata"
7	"Leaves never peltate"	8
8	"Corolla pink to mauve, glabrous; leaves initially ovate, cordate, dentate, becoming hastate with a long linear mid-lobe and shorter dentate basal lobes; sepals ± equal in length"	"Merremia incisa"
8	"Corolla white, yellow or orange; leaves not as above; outer sepals shorter than inner"	9
9	"Corolla 2–3.5 cm long, mid-petaline bands of corolla hairy externally; flowers in umbelliform cymes, rarely solitary"	"Merremia umbellata"
9	"Corolla 2 cm long or less, mid-petaline bands of corolla glabrous; flowers solitary or in few flowered cymes, not umbelliform"	10
10	"Sepals distinctly unequal in length; outer sepals 3–4 mm long elliptic to oblong-elliptic or oblong, slightly concave or flat; inner sepals 4.5–6 mm long; capsule broad-ovoid to globular, smooth"	"Merremia hirta"
10	"Sepals slightly unequal in length; outer sepals 3–7 mm long, broadly ovate to orbicular or broadly spathulate, concave; inner sepals 4–8 mm long; capsule depressed-globular to broad-conical, wrinkled"	11
11	"Outer sepals 4–7mm long, broadly ovate to orbicular, emarginate, not or slightly mucronulate, usually hairy; inner sepals 6–8 mm long; corolla 1.5–2.5cm long; capsule depressed-globose, coarsely wrinkled; petioles appressed pilose, usually without tubercles"	"Merremia gemella"
11	"Outer sepals 3–4 mm long, broadly ovate to spathulate, broadly notched at the apex and distinctly mucronate, mucro directed outwards, usually glabrous; inner sepals 4–5 mm long; corolla 0.5–1 cm long; capsule depressed-globose or broadly conical, somewhat 4-angular, less coarsely wrinkled; petioles often with small tubercles"	"Merremia hederacea"