1	"Leaves toothed, lobed, pinnate or bipinnate"	2
1	"Leaves entire"	7
2	"Leaves pinnate or bipinnate"	3
2	"Leaves toothed or lobed"	5
3	"Leaves pinnate, grey to white-woolly"	"Lavandula pinnata"
3	"Leaves bipinnate, hairy but mostly greenish"	4
4	"Fertile bracts with 5 prominent nerves; leaves and stems mostly shortly hairy"	"Lavandula canariensis"
4	"Fertile bracts with 3 prominent nerves; leaves and stems long-hairy"	"Lavandula multifida"
5	"Leaf margins finely and evenly crinkled along the whole length"	"Lavandula dentata and cvs"
5	"Leaf margins of at least a few leaves with fewer than 10 lobes on each margin (the lobes gathered towards the middle of the leaf edge)"	6
6	"Shrub to 2 m or so tall; virtually all leaves lobed"	"Lavandula ×allardii"
6	"Shrub to 1m tall; only a few leaves at the base of the branches lobed, the rest entire"	"Lavandula ×heterophylla"
7	"At least some of the flower-spike stems branched"	8
7	"Flower stems not branched"	10
8	"Leaves pinnate ."	"Lavandula pinnata"
8	"Leaves undivided"	9
9	"Many flower stems branched; fertile flower bracts more or less linear; late-flowering, mostly summer"	"Lavandula latifolia"
9	"A few flower stems branched; fertile flower bracts more or less ovate; flowering midseason, late spring"	"Lavandula ×intermedia and cvs"
10	"Plants low-growing, with a dense covering of white wool"	"Lavandula lanata"
10	"Plants forming shrubs and subshrubs; leaves green or grey"	11
11	"Leaf veins obscure; flower spike without petal-like bracts at the tip"	12
11	"Leaf veins prominent and raised; flower spike with petal-like upper bracts"	13
12	"Flowers with seeds; bracts about as wide as long; bracteoles minute or absent"	"Lavandula angustifolia and cvs"
12	"Flowers without seeds; bracts longer than wide; bracteoles evident"	"Lavandula ×intermedia and cvs"
13	"Leaves green and often sticky; petal-like bracts green"	"Lavandula viridis"
13	"Leaves grey or grey-green; petal-like bracts purple"	"Lavandula stoechas and cvs"