Hosta longissima

Hosta longissima

Hosta longissima var. longifolia ((Honda 1935) W.G. Schmid 1991)

 

Subgenus Schmid Giboshi Zonneveld Giboshi
Section Schmid Nipponosta Zonneveld Nipponosta
Hosta Library species file Hosta longissima var. longifolia
Origin Japan, Tokai region of central Honshu, which includes Aichi, Shizuoka, Mie and southern Gifu prefectures.  See Map.
Habitat A hygrophyte found primarily in wet meadows, near and on shallow banks of lakes and rivers prone to overflow and in rocky areas where perpetual springs emerge or at water aseepages.
Japanese name Nagaba Mizu Giboshi, Hosoba Mizu Giboshi
Plant 40 cm diameter x 40 cm high (16 x 16"),  the specimens do not form a clump but have an open habit with ranging leaf bundles.  In cultivation erect, vase-shaped
Leaf There is no measurable petiole because the leaves have linear, strap shape and a petiole transition is not discernable,  green with no purple dots at the base.
Leaf 10–24 (30) x 0.8–1.5 cm (4–8 (12") x 0.3–0.6", however some leaves go beyond this size individually, erect at first, bending to the ground later. Length/width ratio of the leaves between 6:1 and 20:1. Flat surface, not rugose, dull, but underside shiny, dark green above.
2 (3) pairs of veins, lightly impressed above, projected, smooth below. Usually, a specimen clump will have very long mature leaves and a number of shorter immature leaves. This is one of the key morphological traits, differentiating this taxon from H. longissima var. brevifolia.  Other key differences are the sparse number of flowers (2 to 6 vs. 4-12).
Inflorescense Scape 35–65 (80) cm (14–26 (32")), thin, straight and erect, not bending, light green, no purple marks, except at base.
Sterile bracts 2–4, small, clasping stem, persistent; fertile bracts short, navicular, thin, membranous, green, withering after anthesis, but not falling away.
Raceme long, 2-4 (6) flowers, widely spaced, few.
Flowers small, striped purple, thin narrow tube, perianth expanding, lily-shaped, tepals spreading, slightly or not recurving, open, short pedicels, projecting stamens and style.
Anthers purple.
Blooming Time August/September
Fertility Fertile
Growing conditions Hard to keep growing.
Suitable for containers  
Special remarks This form is rarely seen in cultivation.  Plants with this name are often mislabeled.
In Hosta Mill Collection No
Sports
  • H. 'Shirofukurin Hosoba Mizu' , a white-margined form, also sold as H. 'Fukurin Hosoba Mizu', H. 'Kanagawa Mizu', H. 'Asahi Comet' (Kato/Zumbar 1984) and H. 'Sand hill Crane' (G. Johnson 2004).
  • H. ' Mango', a white-centered form with twisted leaves
  • H. 'Shiro Nakafu Mizu', a white-centered form, also sold as H. 'Fukurin Hosoba Mizu'.
  • H. 'Kinaki Mizu', a yellow-centered form, also known as H. 'Kinaki Nagaba Mizu', H. 'Kinaki Hosoba Mizu' or H. 'Asahi Star'.
  • H. 'Kifukurin Hosoba Mizu', a yellow-margined form, also sold as H. 'Fukurin Hosoba Mizu'  and H. 'Nishiki Mizu'; also registered as H. 'Asahi Sunray' (Kato/Zumbar 1984).
Progeny  

H. longissima var. brevifolia (F. Maekawa 1940)

Subgenus Schmid Giboshi Zonneveld  
Section Schmid Nipponosta Zonneveld  
Hosta Library species file Hosta longissima var. brevifolia
Origin Japan, primarily in the Tokai region of central Honshu, like the long leafed form, but sporadically occurs beyond this central area and extends from Iwate Prefecture south to Miyazaki Prefecture on Kyushu, , spanning different climate zones.  See Map.
Habitat  
Japanese name Mizu Giboshi = water hosta, Saji Giboshi = long spoon-shaped hosta
Plant 40 cm diameter x 40 cm high (16 x 16"),  clump forming, erect, vase-shaped.
In contrast to H. longissima var. longissima, it forms dense clumps and does not have open habit. However, the size of clumps and the number of leaves per clump varies according to habitat conditions. Larger clumps are seen where there is little competition with other plants. This is one of the key morphological traits, differentiating it from H. longissima var. longifolia.   Other key differences are the larger number of flowers (4-12 per scape) and the fact most leaves in a clump are approximately the same size.
Leaf There is a measurable petiole, extending from ground level to the point where leaf widening begins., green, no purple dots.  Length depends on clump size.
Leaf 15–24 x 2.5-4 cm (6–8 x 1–1.5"), narrow, ovate with margins flowing decurrent to the petiole, which is discernable and clearly a transition to the petiole.  Length/width ratio of the leaves between 6:1 and 8:1. Flat surface, not rugose, surface dull, underside shiny, dark green above.
3 (4) pairs of veins, lightly impressed above, projected, smooth below.
Inflorescense Scape 35-65 (80) cm (14–26 (32) in.), straight and erect, not bending,
light green, no purple marks, except at base.
Sterile bracts 2–4, first clasping stem, then folding out, persistent; fertile bracts short, navicular, thin, membranous, green, withering after anthesis, but not falling away.
Raceme long, 4-12 flowers, widely spaced.
Flowers small, striped purple, thin narrow tube, perianth expanding, lily-shaped, tepals spreading, sometimes recurving, wide open, short pedicels, long projecting stamens and style.
Anthers purple.
Blooming Time August/September
Fertility Fertile
Growing conditions  
Suitable for containers  
Special remarks  
In Hosta Mill Collection No
Sports  
Progeny
  • H. 'Bitsy Gold' (R. P. Savory 1982) = H. longissima var. brevifolia x (unknown)
  • H. 'Bitsy Green' (R. P. Savory 1982) = H. longissima var. brevifolia x (unknown)
  • H. 'Purple Lady Finger' (R. P. Savory 1982) = H. longissima var. brevifolia x H. clausa var. clausa.
  • H. 'William Beard' (Scott Crab 2004) = H. Let's Streak' x H. longissima (var. brevifolia ?)