Hosta kiyosumiensis

Hosta kiyosumiensis (Maekawa 1935/AHS1993)

Subgenus Schmid Giboshi Zonneveld Giboshi
Section Schmid Intermediae Zonneveld Helipteroides
Hosta Library species file Hosta kiyosumiensis
Origin Japan, from Kanto south to Chubu and Kansai, encompassing the entire central part of Honshu.  See Map.
Habitat In the northern areas, the habitat is on relatively dry, low mountain tops and slopes in wooded areas and under sub-shrubs.
Further south the species populations occur in moist bottom land along rivers. There the woodland reaches to the riverbanks , where moist rock ledges and cliffs provide a suitable habitat.
Japanese name Kyosumi Giboshi the hosta from Mount Kiyosumiyama.
Plant 30–45 cm diameter x 25 cm high (12–18 x 10").
Leaf Petiole 7.5–10 cm (0.75"), erect, broadly grooved, keeled, triangular in cross section, green, at the base barely purple dotted.
Leaf 10–15 x 5–7.5 cm (4–6 x 2–3"), (in the wide-leaved form wider and larger) entire, ovate-elliptical to ovate, truncate at base, very pointed, acuminate, elongated tip, wavy surface, undulate in the margin and finely toothed, thin papery texture, light green, opaque, below, shiny light green. 5–6 (10) pairs of veins, sunken above, very projected, markedly strigose, below.
Inflorescense Scape 30–90 cm (12–36"), straight, erect, perpendicular, barely purple-dotted at base.
Sterile bracts, 1–3, large, leafy, sheathed at the base, green, similar to H. `Lancifolia'; fertile bracts, 1–3 cm (0.5–1.25") long, 0.5–1 cm (0.25–0.5") broad, ovate lanceolate, navicular, shiny light green, at first imbricate, fresh and persisting at anthesis, but later falling away.
Raceme 35–75 cm (14–31"), 5–20 flowers.
Flowers 5 x 2.5 cm (2 x 1"), medium size, whitish, very slightly purple suffused inside, expanding, funnel-shaped, in the central part dilated bell-shaped, narrow tube long, stamens almost as long as the perianth, style longer projecting beyond perianth.
Anthers purple.
Blooming Time June/July
Fertility Fertile
Growing conditions  
Suitable for containers  
Special remarks  
In Hosta Mill Collection Yes
Sports
  • H. 'Busen Sug' (Japan/Sugita) : Sug refers to Hajime Sugita who found it
  • H. 'Kifukurin Kiyosumi'  is a yellow-margined sport discovered in Japan.
  • H. 'Nakafu Kiyosumi' (Aichi pr., Japan) : a yellow-centered form with thin green margin. It was found among the wild populations near Nukata-cho, Aichi prefecture in 1984
  • H. 'Sakura Sugi' = H. 'Kifukurin Kiyosumi' 
  • H. 'Seiryu Kiyosumi' is a green cultivar with white streaking found in Japan.
  • H. 'Shinano Nishiki' (Japan) = H. kiyosumiensis sport
Progeny
  • H. 'Amethyst Joy' (P. Ruh 1999) = H. kiyosumiensis x H. pycnophylla
  • H. 'Belle of the Ball' (P. Ruh 1998) = H. kiyosumiensis x H. pycnophylla
  • H. 'Inland Sea' (H. Sugita, M. Zilis, P. Ruh 1998) = H. kiyosumiensis x H. pycnophylla
  • H. 'James A. Garfield' (P. & J. Ruh 2003) = H. pycnophylla x H. kiyosumiensis
  • H. 'Lavender Doll' (P. Ruh 1998) = H. kiyosumiensis x H. pycnophylla
  • H. 'Lavender Stocking' (P. Ruh 1998) = H. kiyosumiensis x H. pycnophylla
  • H. 'Martin Van Buren' (P. & J. Ruh 2005) = H. kiyosumiensis x H. pycnophylla
  • H. 'Quaker Lady' (P. Ruh 1999) = H. kiyosumiensis x H. pycnophylla
  • H. 'Qualifying Queen' (P. Ruh 1999) = H. kiyosumiensis x H. pycnophylla
  • H. 'Swan Lake' (P. Ruh 1998) = H. kiyosumiensis x H. pycnophylla
  • H. 'Toots' (P. Ruh 1998) = H. pycnophylla x H. kiyosumiensis
  • H. 'White Heron' (P. & J. Ruh 2001) = H. kiyosumiensis x H. pycnophylla