JARS v64n2 - American Rhododendron Society Plant Registry

American Rhododendron Society Plant Registry

Introduction : The following rhododendron and azalea names were approved and added to the International Rhododendron Register prior to February 1, 2010 by the Royal Horticultural Society, International Cultivar Registration Authority for the genus Rhododendron . The North American Registrar assisted the RHS by providing data for plants originating in North America.

References : Names conform to the rules and recommendations of the International Code of Nomenclature for Cultivated Plants - 7th Edition (2004). Color numbers refer to the RHS Colour Chart unless noted otherwise. Accompanying color names are taken from A Contribution toward Standardization of Color Names in Horticulture , R.D. Huse and K.L. Kelly, edited by D.H. Voss (ARS, 1984).

Format : Parentage lists the seed parent first, followed by an "(s)" if the direction of the cross is known; this is followed by an upper case "X" and then the name of the pollen parent. If either parent is itself a cross, the individual components within that cross are separated by a lower case "x". Parentheses are used only in describing the more complex crosses. Abbreviations are used where appropriate: (a) = azalea, (r) = rhododendron, (v) = vireya rhododendron, (z) = azaleodendron; H = hybridized by, G = grown to first flower by, R = raised by, S = selected by, N = named by, I = introduced commercially by, REG = registered by; dates are enclosed in parentheses immediately following the activity. Metric conversions of dimensions are reported in 5mm (0.2") increments for dimensions greater than 1" (25mm).

(v) 'Bill Moynier': Vireya (lepidote) rhododendron: ('Gardenia Odyssey' x R. aurigeranum ) (s) X ( R. macgregoriae x R. aurigeranum ). H (1997): William Moynier, Los Angeles, CA; G (2003): Sherla Bertelmann and Richard Marques, Kea'au, HI; N (2009) and I (2007): Pacific Island Nursery, Kea'au, HI; REG (2009): Richard F. Kruppa, Volcano, HI. Fls c 12/flat truss, tubular funnel-shaped, 2.5" (65mm) long x 2.4" (60mm) wide, with 5 wavy-edged lobes; reddish purple in bud, opening inside strong yellowish pink (37B) and (43D) on lobes, blending into a light greenish yellow (4C) tube, the colors darkening with age; outside is similar except that the yellowish pink is limited to the outer margins of the lobes; stigma and style: bright green; filament: very light yellow; anther: brown on one side, cream on the other. Truss 4" (100mm) high x 8" (200mm) wide. Lvs 5.3" x 2.5" (135 x 65mm), elliptic, acuminate apex, cuneate base, upcurved margins; semi-glossy and dark yellowish green (139A) above; no indumentum visible. Shrub 4' (1.2m) high x 5' (1.5m) wide in 8 years; intermediate habit. Plant and bud hardy to at least 40°F (4°C). Flowering three times per year.

(v) 'Easter Pastel': Vireya (lepidote) rhododendron: R. aurigeranum (s) X 'Pink Delight'. H (pre 2000): Peter Sullivan, San Francisco, CA; G (2003) and N (2009): Sherla Bertelmann and Richard Marques, Kea'au, HI; I (2009): Pacific Island Nursery, Kea'au, HI; REG (2009): Richard F. Kruppa, Volcano, HI. Fls 10-14/flat truss, tubular funnel-shaped, 2.4" (60mm) long x 2.4" (60mm) wide, with 5 flat-edged lobes. Color of lobes opening inside strong pink (49A) and pale purplish pink (56A) blending into a very light yellow center that brightens into a pale yellow (20C) throat and tube; outside similar with multiple shades of pink; anther: brown; filament: light yellow; stigma: green; style: light green. Truss 2.5" (65mm) high x 6.5" (165mm) wide. Lvs 5.5" x 2" (140 x 50mm), elliptic, acute apex, cuneate base, upcurved margins; semi-glossy and moderate olive green (147A) above; no indumentum visible. Shrub 2.3' (0.7m) high x 1.3' (0.4m) wide in 5 years; open, upright habit. Plant and bud hardy to at least 40°F (4°C). Flowering spring and fall.

(r) 'Ed's Fall Frolic': Elepidote rhododendron: ( R. yakushimanum x 'Mary Belle') (s) X ('Crest' x 'Evening Glow'). H (2002) and G (2005): H. Edward Reiley, Woodsboro, MD; N (2007), and REG (2009): Mary L. Reiley, Woodsboro, MD. Fls 10/dome truss, funnel-campanulate, 1.5" (40mm) long x 2.3" (60mm) wide, with 6 wavy edged lobes. Color moderate reddish orange (35B) in bud, opening inside light greenish yellow (3D) with deep orange yellow (163A) freckles on three dorsal lobes; outside light greenish yellow (3D) with moderate pink (35D) high lights that fade to light greenish yellow (3D). Calyx lobes c 1.2" (30mm) long, light greenish yellow (3C). Truss 3" (75mm) high x 4" (100mm) wide. Lvs held 4 years, 3.8"-5" x 1.5"-2"(95-125 x 40-50mm), oblong, broadly acute apex, rounded base, flat margins; dull and moderate olive green (137A) above; hairless. Shrub 2.5' (0.8m) high x 4' (1.2m) wide in 7 years; intermediate habit. Plant hardy to at least -15°F (-26°C); buds, -5°F (-21°C). For the past three years, the plant has bloomed completely in October/November.

(r) 'Jack Morgan': Elepidote rhododendron: 'Pink Prelude' (s) X 'Cameo'. H (1992), G, N (2007), and REG (2009): Elsie Watson, Kirkland, WA. Fls 17/ball truss, funnel-campanulate, 3" (75mm) long x 4" (100mm) wide, with 7 frilly-edged lobes. Color moderate pink in bud, opening inside and out light pink, fading nearly to white; dark red brush-like markings in the throat of the dorsal lobe, and smaller markings at base of adjacent lobes. Truss 6" (150mm) high x 7" (175mm) wide. Lvs held 2 years, 6.8" x 2.8" (170 x 70mm), elliptic, acuminate apex, oblique base, flat margins; dull and moderate yellow green (146B-C) above; hairless. Shrub 5.2' (1.6m) high x 5.8' (1.8m) wide in 15 years; dense habit; heavy flower substance; free-flowering. Plant and bud hardy to at least 15°F (-9°C). Flowering March to April.

(r) 'Kaitlyn's Delight': Elepidote rhododendron: Parentage unknown. H: Unknown; N (2009), I (2009), and REG (2009): Corneliussen's Nursery, Gervais, OR. Fls 9/flat truss, campanulate, 1.8" (45mm) long x 2.5" (65mm) wide, with 5 wavy-edged lobes. Color strong red (46A) in bud, opening inside moderate yellowish pink (38B) with a light orange yellow center (22C) fading to light orange yellow (22D), with prominent vivid red (45B) dorsal spotting and many fewer, more subdued spots on remaining lobes; outside deep yellowish pink (39B) fading to strong yellowish pink (35C); bright green stigma. Calyx lobes 1.5" (40mm) long, inside light orange yellow (22C) with vivid red (45A) dorsal spotting; outside deep yellowish pink (39B) with vivid greenish yellow (2A) stripes. Truss 3" (75mm) high x 6" (150mm) wide. Lvs 3.5" x 1.5" (90 x 40mm), elliptic, broadly acute apex, rounded base, flat margins; semi-glossy and dark bluish green (131A) above; hairless. Shrub 2' (0.6m) high x 3' (0.9m) wide in 7 years; intermediate, rounded habit; the large calyx gives the appearance of a double flower. Plant and bud hardy to at least 10°F (-12°C). Flowering mid May.

(v) 'Little Maneau Ra': Vireya (lepidote) rhododendron: [( R. macgregoriae x R. laetum ) x R. saxifragoides ], F2 (s) X [( R. macgregoriae x R. laetum ) x R. saxifragoides ], F2. H (1999): William Moyles, Oakland, CA; G (2003): Richard Marques and Sherla Bertelmann, Kea'au, HI; I (2008): Pacific Island Nursery, Kea'au, HI; N (2009) and REG (2009): Richard F. Kruppa, Volcano, HI. Fls 3-7/flat truss, narrowly funnel-shaped, 0.8"-1" (20-25mm) long x 2" (50mm) wide, with 5 flat-edged lobes. Color of lobes is a mixture of several shades of strong pink (49A, 48D, 50C) and deep purplish pink (55A) blending into a light yellow green tube (approximately 2C), with some reddish smudges between lobes, inside and out; anther: brownish yellow; filament: very light yellow; stigma: maroon; style: brown. Truss 2.8" (70mm) high x 3.5" (90mm) wide. Lvs 2.5"-2.8" x 2.2" (65-70 x 55mm), elliptic, broadly acute apex, cuneate base, upcurved margins; glossy and dark yellowish green (139A) above; no indumentum visible. Shrub 2'-2.3' (0.6-0.7m) high x 1'-1.5' (0.3-0.5m) wide in 5 years; intermediate habit. Plant and bud hardy to at least 45°F (7°C). Flowering usually January to March and September to November.

(a) 'Mary Lou Dority': Evergreen azalea: 'Betty Christopher'* (s) X 'Komo-kulshan'. H (2000), G (2002), N (2009), and REG (2009): Joseph Klimavicz, Vienna, VA. Fls 2-3/truss, saucer-shaped, c 1.8" (45mm) long x 2.8" (70mm) wide, with 5 wavy-edged lobes. Color very pale purple (69A) in bud, opening inside very pale purple (69A) on tips of lobes, fading to white in center, with a tinge of pale green in the throat and a large area of discrete strong purplish red (60B) spots on the dorsal lobes; outside very pale purple (69A) between greenish white midribs. Calyx lobes 0.4" (10mm) long, strong yellow green (144B). Truss 2" (50mm) high x 2.5" (65mm) wide. Lvs 2" x 0.8" (50 x 20mm), elliptic, broadly acute apex, cuneate base, flat margins; glossy and moderate olive green (146A) above; hairless. Shrub 1.5' (0.5m) high x 1.5' (0.5m) wide in 5 years; dense habit. Plant and bud hardy to at least 0°F (-18°C). Flowering mid May.

(r) 'Spring Fragrance': Elepidote rhododendron: ( R. yakushimanum 'Koichiro Wada' x 'Loderi Venus') (s) X 'Van Nes Sensation'. H (1995), G (2002), N (2009), and REG (2009): Frank Fujioka, Freeland, WA. Fls 14/dome truss, broadly funnel-shaped, 3" (75mm) long x 4.5" (115mm) wide, with 6-8 wavy-edged lobes; fragrant. Bud color moderate purplish pink (54D) at base shading to pale purplish pink (56D) near tip, opening inside pale purplish pink (56A) shading to pale purplish pink (55D) near throat, with a 0.5" (c 12mm) wide margin of pale purplish pink (56D) and minimal spotting of strong reddish orange (169A) at the throat; outside pale purplish pink (56D) with streaks of moderate purplish pink (54D) radiating from the base. Calyx minute. Truss 6" (150mm) high x 7" (175mm) wide. Lvs held 2 years, 5" x 2.3" (125 x 60mm), ovate, broadly acute apex, rounded base, wavy margins; semi-glossy and dark yellowish green (139A) above; no indumentum. Shrub 3.5' (1.1m) high x 3' (0.9m) wide in 10 years; intermediate habit. Plant and bud estimated to be hardy to at least 10°F (-12°C). Flowering late April.

The following unregistered name appears as a parent in the above descriptions:
'Betty Christopher': Evergreen azalea. 'Mrs Nancy Dippel' X 'Schroeder's White Glory'. H: Harry Weiskittel, I: Marshy Point Nursery, Chase, MD. Fls semi-double, pink/lavender with a white wash; lvs glossy, dark green. Shrub 2' x 2' (0.6 x 0.6m) in 5 years; fls and lvs relatively small. May.

Additions and Corrections:
(r) 'Double Besse' – cf JARS, 62:4, p 231 (2008): This diploid plant was grown from 'Bikini Island', treated with colchicine. Flowers are hose-in-hose. Ploidy level was determined by Tom Ranney at NCSU.