Hosta aequinoctiiantha

Hosta aequinoctiiantha ((G. Koidzumi ex Y. Araki 1942/AHS 1993)

Subgenus Schmid Giboshi Zonneveld  
Section Schmid Picnolepis Zonneveld  
Hosta Library species file Hosta aequinoctiiantha
Origin Japan, southeastern part of the Gifu prefecture,  near the Shiga prefecture border. See map
Habitat Mountain slopes
Japanese name Ohigan Giboshi  =hosta of the autumnal equinox, because it flowers at this time of year
Plant Small, 35–40 cm diameter, 30 cm high (14–16 inch x 12 inch).
Petiole 12.5–17.5 cm (5–7") long, erect, green, purple dotting starting at leaf base, becoming progressively darker towards ground.
Leaf 7.5–12.5 x 5-7.5 cm (3–5 x 2-3"), erect and in line with the petiole, oval-ovate, petiole transition rounded, truncate, smooth, wavy, thin; tip acuminate, cuspidate; green to dark green above, lighter, opaque green below. pairs of veins 4–6 (7), sunken above, very projected, smooth below.
Inflorescense Scape 25–45 cm (10–18"), straight, but oblique, purple-dotted at base, greener above, smooth round. Fertile bracts 1 cm long (0.3") navicular, thin, membranous, white or whitish green, purple-tinted at first, imbricated, not withering.
Raceme 120 cm (6–8") long with 10–20 flowers.
Flowers white outside in bud, pale purple later, bell-shaped, held erect in horizontal position on long, strong horizontal or slightly ascending purple pedicels, perianth 5 cm (2") long, funnel shaped. Anthers purple, uniformly dotted.
Blooming Time September/October
Fertility Fertile
Growing conditions Light, shady position.  Sun tolerance unknown to me.
Suitable for containers Yes
Special remarks Close relative of H. longipes.
It remains a small plant in culture; many of the cultivated plants don't represent the true species.
In Hosta Mill Collection Yes, since 2007
  • H. 'Kyoto' (H. Sugita/P. Ruh/J. Ruh 2001)= H. aequinoctiiantha x H. pycnophylla.