1	"Epicalyx bracts at least 1.5 times longer than wide"	2
1	"Epicalyx bracts less than 1.5 times as long as their width"	8
2	"Epicalyx bracts up to 1(-1.6) mm wide in fruit"	3
2	"Epicalyx bracts 2-8 mm wide"	5
3	"Stems and leaves sparsely pubescent; plants annual"	"Mehlania annua"
3	"Stems and leaves tomentose; plants usually perennial"	4
4	"Leaves ovate to elliptic with a thick indumentum; epiclayx bracts not recurved; capsules 6-9 mm long"	"Melhania ovata"
4	"Leaves oblong-ellitpic to oblong-linear, indumentum of shorter hairs; epicalyx bracts usually more or less recurved; capsules 4-6 mm long"	"Melhania incana"
5	"Young stems and leaves with a yellowish to brownish indumentum"	6
5	"Young stems and leaves with a whitish or greyish indumentum"	7
6	"Epicalyx bracts 6-8 mm wide, bases cordate; petals 7-11 mm long; styles 0.5-3 mm long"	"Melhania velutina"
6	"Epicalyx bracts 3-4 mm wide, bases cuneate; petals 12-15 mm long; styles 7-8 mm long"	"Melhania engleriana"
7	"Leaf length usually more than twice the width; capsules 5-7 mm long, with 2-3 seeds per cell; epicalyx bracts 5-11 mm long, not recurved in fruit"	"Melhania parviflora"
7	"Leaf length usually less than twice the width; capsules 8-13 mm long, with 4 sees per cell; epicalyx bracts 10-20 mm long, recurved in fruit"	"Melhania rotundata"
8	"Plants annual herbs; epicalyx bracts ovate-triangular in fruit; seeds usually with a smooth black swelling at the distal end"	"Melhania annua"
8	"Plants perennial herbs or shrublets; epicalyx bracts usually more or less reniform; seeds without black swellings"	9
9	"Sepals almost glabrous but with minute scattered hairs towards the base"	"Melhania hiranensis"
9	"Sepals hairy, at least along the median line"	10
10	"Petals 7-10 mm long; seeds 3-4 mm long, tuberculate"	"Melhania phillipsiae"
10	"Petals 2.5-7 mm long; seeds 1.6-3 mm long, if 3 mm then smooth"	11
11	"Flowers usually solitary, rarely in 2-flowered cymes"	12
11	"Flowers in 2-8 flowered cymes or some solitary"	14
12	"Stipules soon falling"	"Melhanis muricata"
12	"Stipules more or less persistent"	13
13	"Leaves almost entire or with shallowly serrate margins; seeds tubercular"	"Melhania stipulosa"
13	"Leaves with deeply sinuate marginsl seeds smooth"	"Melhania quercifolia"
14	"Stipules 10-30 mm long, more or less persistent"	"Melhania coriacea"
14	"Stipules 3-12 mm long, often soon falling"	15
15	"Sepals pilose to pubescent all over; peduncles 5-40 mm long"	"Melhania dehamii"
15	"Sepals pilose mainly over the median and the more or less acuminate tip; peduncles 2-10 mm long"	"Melhania kelleri"