1	"Leaf blades short (less than 25 cm)"	2
1	"Leaf blades long (more than 25 cm)"	13
2	"Leaves wide (more than 6 cm)"	3
2	"Leaves narrow (less than 6 cm)"	6
3	"Side vein pairs 10–13"	"Hosta tokudama"
3	"Side vein pairs 4–9"	4
4	"Leaves waxy blue"	Hosta×tardiana
4	"Leaves green"	5
5	"Leaves lanceolate to narrowly elliptic; side vein pairs 4–5"	"Hosta tardiflora"
5	"Leaves ovate to elliptic; side vein pairs 6–8"	"Hosta longipes"
5	"Leaves broadly elliptic to almost round; side veins 7–9"	"Hosta ventricosa"
6	"Side vein pairs 3–4"	7
6	"Side vein pairs 5–9"	9
7	"Leaf stalks unspotted; leaves leathery"	"Hosta longissima"
7	"Leaf stalks spotted; leaves membranous"	8
8	"Anthers yellow"	"Hosta seiboldii"
8	"Anthers greyish-purple"	"Hosta venusta"
9	"Side vein pairs 5–6"	10
9	"Side vein pairs 6–9"	11
10	"Leaves lanceolate, tapering basally"	"Hosta lancifolia"
10	"Leaves broadly ovate, rounded or truncate basally"	"Hosta minor"
11	"Leaves erect, upright"	"Hosta rectifolia"
11	"Leaves spreading"	12
12	"Leaves undulate; tips twisted"	"Hosta undulata"
12	"Leaves not undulate; tips not twisted"	"Hosta cathayana"
13	"Leaves with a dull lustre, grey to bluish waxy underneath"	14
13	"Leaves not dull and waxy underneath"	16
14	"Side vein pairs 14–18"	"Hosta seiboldiana"
14	"Side vein pairs 8–13"	15
15	"Leaves tapering and twisting"	"Hosta fluctuans"
15	"Leaves heart-shaped to ovate and not twisted"	"Hosta fortunei"
16	"Leaves shiny underneath"	17
16	"Leaves not shiny underneath"	18
17	"Anthers yellow"	"Hosta plantaginea"
17	"Anthers greyish-purple"	"Hosta venusta"
18	"Side vein pairs 10–13; anthers pale yellow; leaves not twisted"	"Hosta montana"
18	"Side vein pairs 7–9; anthers yellow, becoming purple; leaves twisted"	"Hosta crispula"