BACKGROUND OF THE INVENTION
The present invention, Hosta ‘American Icon’,
relates to a new and distinct cultivar of Hosta,
botanically known as a Hosta hybrid, hereinafter
referred to as 'American Icon'.
The inventor discovered the new cultivar, 'American Icon’, in summer of 1999 in a tissue culture lab in
Waseca, Minnesota. 'American Icon' originated as a
naturally-occurring sport of Hosta ‘Choo Choo Train' (unpatented). The parent plant, Hosta 'Choo Choo Train’, is non-variegated with yellow-green
foliage. 'American Icon' is unique in having foliage
with yellow-green margins surrounding green centers.
Asexual reproduction of the new cultivar was first
accomplished by the inventor utilizing in vitro
propagation in Waseca, Minnesota. in fall of 2002. Asexual
reproduction of the new cultivar by division and tissue
culture has shown that the unique features of 'American Icon' are stable and reproduced true to type in
BRIEF SUMMARY OF THE INVENTION
The following traits have been repeatedly observed in
trials in Minnesota for a period of six years and
represent the characteristics of the new cultivar. These
attributes in combination distinguish 'American Icon' as
a new and unique cultivar of Hosta.
1. The foliage of 'American Icon' is variegated with
yellow-green margins and green centers, with margin
width ranging from 3 to 7 cm (2.8 in.) . The margins comprise about
one third of the leaf area. The foliage of the parent
plant, 'Choo Choo Train’, is non-variegated with
2. 'American Icon' has large, broad leaves with mounded
3. 'American Icon' reaches a height of about 56 cm (22 in.),
exclusive of flower scapes, and a spread of about 157 cm (62 in.)
in six years.
4. 'American Icon' has large leaves with undulating
margins when mature.
5. 'American Icon' blooms in early to mid summer with
pale lavender flowers that arise above the foliage.
The closest comparison plant is 'Journey's End’, a sibling
of 'American Icon’, which differs in having leaves with
the reverse variegation pattern to 'American Icon’;
yellow green centers and green margins. 'American Icon' can also be compared to 'Satisfaction' (not patented), a
plant of similar stature and leaf variegation pattern. 'Satisfaction' is a chimeral mutation of golden foliaged 'Piedmont Gold' (not patented). 'Satisfaction' differs
from 'American Icon' in having less ruffled leaf margins
and by emerging earlier in the spring resulting in
susceptibility to frost damage, particularly in the
Southern regions of the U.S.
BRIEF DESCRIPTION OF THE DRAWING
The accompanying colored photographs illustrate the
overall appearance and distinct characteristics of the
new Hosta. The photographs were taken in June of
mature plants of 'American Icon' and 'Choo Choo Train' as grown outdoors in Waseca, Minnesota. under the same
conditions for six years.
FIG. 1 provides an overall view of the foliage and plant
habit of the new cultivar, 'American Icon'.
The photograph in FIG. 2 provides a comparison between a
leaf of 'American Icon' (shown on left) and 'Choo Choo Train' (shown on right) as grown in medium shade.
The colors in the photographs are as close as possible
with the photographic and printing technology utilized
and combined with the color values cited in the DETAILED BOTANICAL DESCRIPTION accurately describe the colors of
the new Hosta.
DETAILED BOTANICAL DESCRIPTION OF THE PLANT
The following is a detailed description of six year-old
plants of the new cultivar as grown outdoors in Waseca, Minnesota. The phenotype of the new cultivar may vary with
variations in environmental, climatic, and cultural
conditions, as it has not been tested under all possible
environmental conditions. The color determination is in
accordance with the 2001 The
Royal Horticultural Society Colour Chart, London, England, except
where general color terms of ordinary dictionary
significance are used.
+ Botanical Classification: 'American Icon' is a cultivar
of Hosta of hybrid origin.
+ Parentage: Naturally occurring sport of Hosta 'Choo Choo Train' (not patented).
+ General description:
Blooming period. About
4 weeks from mid June to mid July.
Plant habit. Herbaceous
perennial, clump-forming, mounded habit of large, broad
Height and spread. Reaches
about 56 cm (22 in.) in height (excluding flower scapes) and
about 157 cm (62 in.) in width.
Zones 3 to 8.
to full shade, moist soils of moderate fertility.
Diseases and pests. Average
substance confers some resistance to slugs. No
susceptibility or resistance to diseases or other pests
has been observed for 'American Icon'.
Root description. Freely
Propagation: In vitro
propagation is the preferred method utilizing typical
methods for Hosta, division are also possible.
Root development. Rooted
transplants from tissue culture fully develop in a
96-cell liner in about 6 to 8 weeks in a greenhouse with
average temperatures of about 70° F.
Growth rate. Vigorous.
+ Foliage description:
Leaf shape. Broadly
Leaf division. Simple.
Leaf base. Cordate.
Leaf apex. Cuspidate.
Leaf venation: 14
pairs of veins, camptodrome pattern, impressed on upper
surface and raised on lower surface, color matches leaf
Leaf margins. Entire,
slightly rippled on mature leaves.
Leaf attachment. Petiolate.
Leaf arrangement. Basal,
radiate spirally from base.
Leaf surface. Glabrous
(upper and lower surface).
Leaf substance. Average.
Leaf orientation. Held
horizontal on upright petioles.
Leaf color. Emerging
and mature foliage, upper surface; centers 137B, margins
range from 144B to 144C, no significant intermediate
area between the margins and centers, lower surface;
centers 191A, margins 138B, no significant intermediate
area between the margins and centers.
Leaf variegation pattern. Margins
about 3 to 7 cm (2.8 in.) in width, comprising at least one third
of the leaf area.
Leaf size. About
30 cm (11.8 in.) in length, about 22 cm (8.7 in.) in width.
Leaf quantity. About
5 to 7 per shoot (eye).
Petiole size. About
46 mm in length, about 1.4 cm (0.6 in.) in width.
Petiole color. Inner
surface 138B, outer surface 138C.
Petiole surface. Glabrous.
Petiole shape. Sulcate.
+ Flower scape description:
Scape shape. Round,
Scape number. One
per mature eye under normal growing conditions.
Scape posture. Straight,
held upright at about 80 to 90° from horizontal.
Scape size. About
76 cm in length, about 1.0 cm (0.4 in.) in width.
Scape color: 146C.
Scape surface. Glabrous.
Leaf bracts. None
+ Flower description:
Inflorescence type. Terminal
racemes of single bell-shaped flowers on elongated
Lastingness of inflorescence. About
4 weeks from first opening bloom to fading of last
opening bloom, individual blooms last about one week.
Flower shape. Bell-shaped.
Flower number: 30
Flower internode length. About
4.0 cm (1.6 in.) .
Flower fragrance. None
Flower bud shape. Spathulate.
Flower bud size. About
3 cm (1.2 in.) in length and 1.3 cm (1.2 in.) in diameter.
Flower bud color. Emerges
92D, matures to 91D prior to opening.
Flower size. About
5.5 cm (2.1 in.) in length and about 3 cm (1.2 in.) in diameter.
Flower color: 92D
(violet-blue), slightly lighter.
Pedicels. About 1.0 cm (0.4 in.) in length, 2 mm in diameter, 148D in color.
Perianth features. Comprised
of 6 tepals, 3 interior and 3 exterior, overlapping in
expanded region and fused in tube region.
Tepal shape. Oblanceolate.
Tepal size. About 5 cm (2 in.) in length, about 1.0 cm (0.4 in.) in width.
Tepal color. Outer
and inner surfaces 92D (slightly lighter), inner stripe
about 1 to 2 mm in width of 76B.
Tepal texture. Glabrous.
Tepal margin. Entire.
Tepal base. Cuneate
Tepal apex. Acute.
Floral bracts: 1
per flower, ovate in shape, glabrous surface, 14C in
color, up to 3.5 cm (1.4 in.) in length and 1.0 cm (0.4 in.) in width.
Pistil, style is about 1.0 cm (0.4 in.) in length, 3 mm in width and
8D in color, stigma is 3-lobed and 8D in color, ovary is
superior, compound, composed of 3 locules, 146D in
stamens, filament is 8D in color, 5 cm (2 in.) in length, 1 mm
in width, length is slightly shorter than perianth,
anthers are 3 mm in length, 1 mm in width, attachment is
versatile, 202A in color, dehiscence is longitudinal,
pollen is abundant and 15B in color.
3-chambered, about 4.0 cm (1.6 in.) in length, 8 mm in width, 138A
to 30 seeds per capsule, about 5 to 6 mm in length and 3
mm in width, 202A in color.