Although taxonomists continue to debate the status of hosta species (it's part of their job afterall), W. George Schmidt in his 1991 classic, The Genus Hosta decided that there were 43 species. Since that time, he changed his mind on Hosta sieboldiana in 2010 and now he and The American Hosta Society call it a cultivar, H. 'Sieboldiana'. Listed below are the hosta species as we know them today...at least for now.

 
 
 
Total ListPlant SizeLeaf ColorVariegationVar ColorOriginFlower ColorSeasonSourceRegistered
H. aequinoctiianthaMediumMed-Green--UnknownLight-PurpleSeptemberSpecies from Japan--NR--
H. alismifoliaLargeDark-Green--UnknownLight-PurpleJulySpecies from Japan--NR--
H. atropurpureaSmallMed-Green--UnknownDeep-PurpleJulySpecies from Japan--NR--
H. callianthaMediumMed-Green--UnknownLight-PurpleAugust to OctoberSpecies from Japan--NR--
H. capitataMediumDark-Green--UnknownDeep-PurpleJune into JulySpecies from Korea--NR--
H. cathayanaMediumMed-Green--UnknownMed-LavenderAugust to OctoberSpecies from China--NR--
H. clausaLargeDark-Green--UnknownDeep-PurpleJuly into AugustSpecies from Korea--NR--
H. clavataSmallLight-Green--UnknownLight-PurpleAugust to OctoberSpecies from Japan--NR--
H. crassifoliaLargeMed-Green--UnknownPure-WhiteJune into JulySpecies from Japan--NR--
H. densaMediumGreen--UnknownLight-PurpleSeptemberSpecies from Japan--NR--
H. fluctuansLargeMed-Green--UnknownNear-WhiteJuly into AugustSpecies from Japan--NR--
H. gracillimaSmallMed-Green--UnknownLight-PurpleSeptember to OctoberSpecies from Japan--NR--
H. hypoleucaMediumMed-Green--UnknownPale-LavenderJulySpecies from Japan--NR--
H. ibukiensisSmallMed-Green--UnknownLight-PurpleJulySpecies from Japan--NR--
H. jonesiiMediumGreen--UnknownLight-PurpleAugustSpecies from Korea--NR--
H. kikutiiMediumMed-Green--UnknownPale-LavenderAugust to OctoberSpecies from Japan--NR--
H. kiyosumeninsisMiniatureMed-Green--UnknownPure-WhiteJune into JulySpecies from Japan--NR--
H. laevigataMediumDark-Green--UnknownLight-PurpleAugust to OctoberSpecies from Korea--NR--
H. longipesSmallDark-Green--UnknownLight-PurpleAugust to OctoberSpecies from Japan--NR--
H. longissimaSmallMed-Green--UnknownLight-PurpleAugust to OctoberSpecies from Japan--NR--
H. minorSmallGreen--UnknownLight-PurpleJulySpecies from Korea--NR--
H. montanaLargeMed-Green--UnknownPale-LavenderJune into JulySpecies from Japan--NR--
H. nakaianaMediumDark-Green--UnknownLight-PurpleJulySpecies from Korea--NR--
H. nigrescensGiantBlue/Green--UnknownPale-LavenderJuly into AugustSpecies from Japan--NR--
H. okamotoiSmallMed-Green--UnknownLight-PurpleSeptemberSpecies from Japan--NR--
H. pachyscapaLargeMed-Green--UnknownPale-LavenderAugustSpecies from Japan--NR--
H. plantagineaLargeMed-Green--UnknownPure-WhiteAugust to OctoberSpecies from China--NR--
H. pulchellaSmallMed-Green--UnknownLight-PurpleAugust to OctoberSpecies from Japan--NR--
H. pycnophyllaLargeLight-Green--UnknownMed-LavenderAugust to OctoberSpecies from Japan--NR--
H. rectifoliaMediumBlue/Green--UnknownLight-PurpleJulySpecies from Japan--NR--
H. rohdeifoliaSmallMed-GreenMarginalYellowUnknownPale-LavenderJuly into AugustSpecies from Japan--NR--
H. rupifragaSmallMed-Green--UnknownPale-LavenderSeptemberSpecies from Japan--NR--
H. shikokianaSmallMed-Green--UnknownLight-PurpleJuneSpecies from Japan--NR--
H. sieboldianaGiantBlue/Green--UnknownPure-WhiteJulySpecies from Japan--NR--
H. sieboldiiSmallMed-GreenMarginalWhiteUnknownLight-PurpleAugustSpecies from Japan--NR--
H. takahashiiMediumLight-Green--UnknownLight-PurpleAugustSpecies from Japan--NR--
H. takiensisMediumMed-Green--UnknownLight-PurpleSeptemberSpecies from Japan--NR--
H. tardivaSmallMed-Green--UnknownPale-LavenderSeptemberSpecies from Japan--NR--
H. tibaeMediumDark-Green--UnknownLight-PurpleSeptemberSpecies from Japan--NR--
H. tsushimensisMediumMed-Green--UnknownLight-PurpleAugustFujita, Dr Noboru--NR--
H. ventricosaLargeDark-Green--UnknownLight-PurpleJulySpecies from China--NR--
H. venustaMiniatureMed-Green--UnknownPale-LavenderJune into JulySpecies from Korea--NR--
H. yingeriSmallMed-Green--UnknownLight-PurpleSeptemberSpecies from Korea--NR--
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