1	"Plants densely covered with branched hairs"	"Endostemon tomentosus"
1	"Plants with unbranched hairs only"	2
2	"Fruiting calyces spherical in outline, the upper lip enlarging, developing coiled side lobes; pedicels terete, 6-11 mm long in fruit"	"Endostemon leucosphaerus"
2	"Fruiting calyces more or less elongate in outline; pedicels flat or almost terete, 2-5 mm long in fruit"	3
3	"Fruiting calyces closed or almost so, their throats glabrous or very slightly hairy; lateral lobes obliquely truncate to rounded"	4
3	"Fruiting calyces open, their throats villous; lateral lobes acute or slightly acuminate"	5
4	"Corollas 3-6 mm long, red or purple, their tubes 1-1.7 times as long as the calyces"	"Endostemon tereticaulis"
4	"Corolla 6-10 mm long, pink or white, their tubes 1.7-2.2 times as long as the calyces"	"Endostemon kelleri"
5	"Lateral leaf veins very prominent, thickened on the lower surface towards the margin"	"Endostemon stenoneurus"
5	"Lateral veins not very prominent, uniformly thick or thin on the lower surface towards the margin"	6
6	"Corollas 3-4.5 mm long; verticillasters with 4-6 flowers"	"Endostemon gracilis"
6	"Corollas 5-15 mm long; verticillasters with 2-4 flowers"	7
7	"Corollas 5-7 mm long, 4-lobed, the upper lobe widest; verticillasters with 2-4 flowers"	"Endostemon obbiadensis"
7	"Corollas 7-10 mm long, 5-lobed; verticillasters with 2 flowers"	8
8	"Upper calyx lobes much larger than the others"	"Endostemon tenuiflorus"
8	"Upper calyx lobes only slightly larger than the others"	9
9	"Corolla tubes strongly widened towards the mouth; lower lips 3-lobed for about 3/4th its length; corollas 10-20 mm long"	"Endostemon tenuiflorus"
9	"Corolla tubes shardly widened towards the mouth; lower lips 3-lobed almost to the base; corollas 12-14 mm long"	"Endostemon racemosus"