1	"Leafy twigs slender, 1-2(3) mm in diameter"	2
1	"Leafy twigs robust, 3-9 mm in diameter"	5
2	"Leaves with (9)10 to 13 pairs of veins"	"Gardenia pyriformis subsp. pyriformis"
2	"Leaves with 7 to 9(10) pairs of veins"	3
3	"Plants with grey mottled ochre to rusty yellow bark; fruit 22-30 mm long, with pedicels 5-10 mm long"	"Gardenia pyriformis subsp. keartlandii"
3	"Plants with dark brown bark; fruit 30-35 mm long, with pedicels 10-35 mm long"	4
4	"Leaves with lamina ovate to elliptic; stipules (5)8-17 mm long usually copiously resinous (north-western Northern Territory and eastern Kimberley, Western Australia)"	"Gardenia resinosa subsp. resinosa"
4	"Leaves with lamina oblanceolate to narrowly elliptic; stipules 3-6 mm long, not resinous (Mitchell Plateau, Western Australia)"	"Gardenia resinosa subsp. kimberleyensis"
5	"Leaves tomentose to sericeous"	6
5	"Leaves glabrous to minutely hairy"	7
6	"Fruit 20-25 mm long; bark glaucous mauve to dark brown; corolla tube 10-12 mm long; leaves subsessile, petioles 0-3 mm long"	"Gardenia sericea"
6	"Fruit 35-70 mm long; bark light grey, mottled ochre to rusty yellow; corolla tube 15-25 mm long; petioles 3-15 mm long"	"Gardenia megasperma"
7	"Leafy twigs 5-9 mm diameter; calyx tube more than 10 mm long; calyx lobes flattened into radial blades"	8
7	"Leafy twigs 3-5 mm diameter; calyx tube less than 8 mm long; calyx lobes linear or absent, not flattened into blades"	9
8	"Fruit with laterally flattened calyx spurs more than 5 mm wide; leaves with 6 to 9 pairs of secondary veins, often covered with sticky resin; stipules bullet-shaped, mammilliform"	"Gardenia dacryoides"
8	"Fruit with narrow laterally flattened calyx spurs less than 5 mm wide; leaves with 10 to 15 pairs of secondary veins, not often covered with sticky resin and stipules conical, not mammilliform"	"Gardenia gardneri"
9	"Leaves ovate to elliptic, resinous"	"Gardenia resinosa subsp. resinosa"
9	"Leaves obovate to oblanceolate, not resinous"	10
10	"Fruits 30-45 mm long on erect, gradually tapering pedicels; leaves with 11 to 13 pairs of secondary veins"	"Gardenia ewartii subsp. ewartii"
10	"Fruits 20-30 mm long on reflexed, abruptly tapering pedicels; leaves with 8 to 10 pairs of secondary veins"	"Gardenia ewartii subsp. fitzgeraldii"