JARS v64n3 - 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 May 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.<.p>

References : Names conform to the rules and recommendations of the International Code of Nomenclature for Cultivated Plants – 8th Edition (2009). 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).

(r) 'Amber Peach': Elepidote rhododendron: 'Apricot Fantasy' (s) X 'Hill's Low Red'. H (1994), G (1999), N (2010), and REG (2010): Jim Barlup, Bellevue, WA. Fls 13/dome truss, broadly funnel-shaped, 2" (50mm) long x 3" (75mm) wide, with 5 wavy-edged lobes. Color moderate red (47A) in bud, opening throughout light orange yellow (22D) blending to strong pink (50C) at the margins; vivid red (46B) nectar pouches extend c 0.25" (6mm) from the base on all lobes. Calyx lobes variable, as long as 1" (25mm); light orange yellow (22D) with vivid red (46B) flares extending c 0.25" (6mm) from base on all lobes. Truss 5" (125mm) high x 5.5" (140mm) wide. Lvs held 2 years; 4.25" x 1.75" (105 x 45mm), elliptic., broadly acute apex, rounded base, flat margins; semi-glossy and moderate olive green (147A) above; hairless. Shrub 3' (0.9m) high x 3.5' (1.1m) wide in 10 years; intermediate habit. Plant hardy to at least 10°F (-12°C). Flowering early May.

(v) 'Bruce Winter': Vireya (lepidote) rhododendron: [( R. macgregoriae x R. aurigeranum ) x 'Doctor Herman Sleumer'] (s) X ( R. konori x R. christianae ). H (2002), G, N (2010), and REG (2010): R.A. "Mitch" Mitchell, Volcano, HI. Fls 6-7/flat truss, tubular funnel-shaped, 2.6" (65mm) long x c 2.5" (65mm) wide, with 5-7 frilly-edged lobes; lightly scented. Color inside and out strong red (51A), shading into pink and then yellow-green down throat and tube, with 0.07" (1.8mm) diameter brownish-yellow spots at lobe margins, inside and out; stigma: light green; style: very light yellow; anther: very dark brown; filament: very light yellow. Truss 4" (100mm) high x 7" (175mm) wide. Lvs 5.5" x 2.1" (140 x 55mm), elliptic, broadly acute apex, rounded base, semi-glossy and moderate olive green (137B) above; no indumentum visible. Shrub 3' (0.9m) high x 2' (0.6m) wide in 7 years; intermediate habit. Plant and bud hardy to at least 38°F (3°C). Flowering in January.

(r) 'CeeCee': Elepidote rhododendron: 'Vulcan' (s) X R. hyperythrum . H (1997), G (2000), N (2000), and REG (2010): Stan B. Southerland, Chapel Hill, NC. Fls up to 11/dome truss, openly funnel-shaped, 1.8" (45mm) long x 2.3" (55mm) wide, with 5 flat-edged lobes. Color close to deep purplish pink (61D) throughout, unmarked. Truss 3.3" (85mm) high x 4.8" (120mm) wide. Lvs held 3 years; 5.5" x 2" (140 x 50mm), elliptic, broadly acute apex, rounded base, flat margins; dull and dark green above; hairless. Shrub 5' (1.5m) high x 6' (1.8m) wide in 12 years; dense habit; heat and insect tolerant; free-flowering. Plant and bud hardy to at least -10°F (-23°C). Flowering early April.

(r) 'Evening Embers': Elepidote rhododendron: 'Plum High' (s) X 'Olin O. Dobbs'. H (1996), G (2000), N (2009), and REG (2010): Jim Barlup, Bellevue, WA. Fls 18/ball truss, broadly funnel-shaped, 2" (50mm) long x 2.8" (70mm) wide, with 6 wavy-edged lobes. Color dark red (59A) in bud, opening inside and out strong purplish red (60B) shading to darker edges of deep red (60A); with spotted dark grayish reddish brown (200A) flares on two dorsal lobes, starting c 0.4" (10mm) from base and extending c 1" (25mm). Truss 5" (125mm) high x 6" (150mm) wide. Lvs held 2 years; 4.8" x 2" (120 x 50mm), elliptic, broadly acute apex, rounded base, down-curved margins; dull and moderate olive green (147A) above; hairless. Shrub 2' (0.6m) high x 3' (0.9m) wide in 10 years; intermediate habit. Plant hardy to at least 0°F (-18°C). Flowering late May.

(r) 'Golden Mist': Elepidote rhododendron: 'Percy Wiseman' (s) X 'Windwalker'. H (2003), G (2007), N (2010), and REG (2010): Jim Barlup, Bellevue, WA. Fls 18/ball truss, saucer-shaped, 1.8" (45mm) long x 3" (75mm) wide, with 5 wavy-edged lobes. Color deep pink (48A) in bud, opening inside light yellow (10C), shading lighter to pale greenish yellow (10D) at margins of all lobes, with a strong greenish yellow (153B) flare on dorsal lobe extending c 1.2" (30mm) from base; outside pale greenish yellow (10D). Calyx lobes c 0.4" (10mm) long, light yellow (10C). Truss 5.5" (140mm) high x 6" (150mm) wide. Lvs held 2 years; 5.5" x 2.2" (140 x 55mm), elliptic, broadly acute apex, rounded base, flat margins; glossy and moderate olive green (147A) above; hairless. Shrub 2' (0.6m) high x 2.5' (0.8m) wide in 6 years; intermediate habit. Plant hardy to at least 0°F (-18°C). Flowering mid May.

(r) 'June Wedding': Elepidote rhododendron: Parentage unknown. H: unknown; G (1985), and N (2009): Clive L. Justice, Vancouver, BC, Canada; REG (2009): Douglas Justice, New Westminster, BC, Canada. Plant grown from unknown seed collected from RHS Wisley Garden; resembles R. decorum var. cordatum based on Glendoick catalog "Flora of China", but with longer petioles. Fls 5-7/dome truss, broadly funnel-shaped, 2.8" (70mm) long x 3.6" (90mm) wide, with 7 wavy-edged lobes. Color greenish white in bud, opening white inside and outside with a central blotch of a yellowish green color close to brilliant yellow green (142B), marked in the quadrant between 10 and 2 o'clock with an orange-like color between approximately strong orange yellow (24B) and vivid reddish orange (34B). Calyx lobes minute, c 1mm long, green. Truss 4.8" (120mm) high x 8" (200mm) wide. Lvs held 1-2 years; 8" x 2.8" (200 x 70mm), oblong, broadly acute apex, minutely cordate base, down-curved margins; semi-glossy and mid green above; hairless. Shrub 16.3' (5m) high x 9.8' (3m) wide in 45 years; open habit. Plant and bud hardy to at least 5°F (-15°C). Flowering late June.

(v) 'Kimo': Vireya (lepidote) rhododendron: R. konori (Jakes form) (s) X ( R. konori var. phaeopeplum x R. zoelleri ). H (2002), G (2008), N (2010), and REG (2010): R.A. "Mitch" Mitchell, Volcano, HI. Fls 8-9/flat truss, elongated tubular funnel-shaped, 3.2" (80mm) long x 3.4" (85mm) wide, with 5-7 frilly-edged lobes; strongly scented. Color inside and out pale yellow green (157C) to greenish white (157D) with tube outside very light yellow (color barely detectable); brownish spots, less than 0.03" (c 0.8mm) diameter at lobe margins; stigma: light green; style: very light pink; anther: light tan; filament: white. Truss 4" (100mm) high x 8" (200mm) wide. Two distinct leaf shapes present: (a) elliptic, acuminate apex, cuneate base, 4.3" x 2.2" (110 x 55mm), and (b) obovate, broadly acute apex, rounded base, 4.3" x 2.4" (110 x 60mm); all semi-glossy and dark yellowish green (139A) above; no indumentum visible. Shrub 2.5' (0.8m) high x 2' (0.6m) wide in 7 years; dense habit. Plant and bud hardy to at least 38°F (3°C). Flowering in January.

(r) 'Mama Cook': Elepidote rhododendron: ( R. macrophyllum x 'Britannia') (s) X ('Ruby Bowman' x R. elliottii 'War Paint'). H (1997): David Goheen, Camus, WA; G (2000), N (2000), and REG (2010): Stan B. Southerland, Chapel Hill, NC. Fls up to 18/dome truss, openly funnel-shaped, 2" (50mm) long x 2.5" (65mm) wide, with 5 wavy-edged lobes. Color close to moderate red (47A), with tiny dark red speckles scattered randomly on all lobes, and a concentration of these speckles forming a dorsal blotch. Truss 3.3" (85mm) high x 5" (125mm) wide. Lvs held 2 years; 5.8" x 2.5" (145 x 65mm), elliptic, broadly acute apex, rounded base, flat margins; semi-glossy and dark green above, with a faint orange coating on underside of leaves at maturity. Shrub 5.2' (1.6m) high x 4' (1.2m) wide in 13 years; open habit; free-flowering. Plant and bud hardy to at least -5°F (-21°C). Flowering early May.

(r) 'Papa Cook': Elepidote rhododendron: 'Red River' (s) X R. hyperythrum . G (2001): Joseph Warren Cook, Whiteville, NC; H (1997), N (2001), and REG (2010): Stan B. Southerland, Chapel Hill, NC. Fls 16/ dome truss, broadly funnel-shaped, 2" (50mm) long x 2.8" (70mm) wide, with 5 flat-edged lobes. Color vivid purplish red (N57A) in bud, opening inside deep purplish pink (68A) at margin, fading to lighter pink, and then white towards center, with a spotted vivid red (45A) dorsal blotch; outside deep purplish pink (73A) fading to white at base. Truss 5.5" (140mm) high x 8.5" (215mm) wide. Lvs thick with a depressed midrib, held 3 years; 6" x 1.8" (150 x 45mm), elliptic, broadly acute apex, rounded base, down-curved margins; dull and dark green above; hairless. Shrub 4' (1.2m) high x 4' (1.2m) wide in 13 years; dense habit; heat tolerant; free-flowering. Plant and bud hardy to at least -10°F (-23°C). Flowering early April.

(r) 'Rose Tango': Elepidote rhododendron: 'Crimson Constellation' (s) X 'Plum Passion'. H (2002), G (2006), N (2010), and REG (2010): Jim Barlup, Bellevue, WA. Fls 17/ball truss, broadly funnel-shaped, 2" (50mm) long x 3" (75mm) wide, with 5 wavy-edged lobes. Color dark red (59A) in bud, opening inside very pale purple (76C) except the dorsal lobe which is very pale purple (76D), all lobes edged strong purple (77B); outside very pale purple (76C) with darker midribs and edging of strong purple (77B); brilliant yellow green (150C) spotting on dorsal lobe beginning 1" (25mm) from base and extending almost to the darker edging. Truss 5" (125mm) high x 5.5" (140mm) wide. Lvs held 2 years; 4.4" x 2.2" (110 x 55mm), elliptic., broadly acute apex, rounded base, down-curved margins; semi-glossy and moderate olive green (147A) above; hairless. Shrub 2' (0.6m) high x 3' (0.9m) wide in 7 years; intermediate habit. Plant hardy to at least 0°F (-18°C). Flowering early May.

(r) 'Sun Silk': Elepidote rhododendron: 'Command Performance' (s) X 'Goldprinz'*. H (2003), G (2007), N (2010), and REG (2010): Jim Barlup, Bellevue, WA. Fls 24/ball truss, broadly funnel-shaped, 2.4" (60mm) long x 3.4" (85mm) wide, with 7 wavy-edged lobes. Color light orange yellow (16C) in bud, opening inside pale yellow (8D) with the dorsal lobe a deeper shade of light greenish yellow (8B); outside coloring similar; discrete patches of strong red (53C) spots inside on each of two dorsal lobes located c 1.5" (40mm) from base, and brush-like strong red (53C) flares on the dorsal lobes, extending c 0.4" (10mm) from base. Calyx lobes c 0.4" (10mm) long, light greenish yellow (8D) with a touch of strong red (53C) at the edge. Truss 6" (150mm) high x 5" (125mm) wide. Lvs held 2 years; 4.5" x 2.2" (115 x 55mm), elliptic, broadly acute apex, rounded base, flat margins; glossy and moderate olive green (147A) above; hairless. Shrub 3' (0.9m) high x 2' (0.6m) wide in 6 years; open habit. Plant hardy to at least 0°F (-18°C). Flowering early May.

(r) 'Vanilla Torch': Elepidote rhododendron: 'Capistrano' (s) X 'Tia'. H (2000), G (2004), N (2010), and REG (2010): Jim Barlup, Bellevue, WA. Fls 13/ball truss, broadly funnel-shaped, 1.8" (45mm) long x 2.8" (70mm) wide, with 5 wavy-edged lobes. Color deep pink (48A) in bud, opening throughout pale yellow (11C), blending to pale yellow green (4D) at margins; strong red (53C) flares on all lobes extending c 1" (25mm) from base, much more pronounced on dorsal lobes. Truss 3.25" (80mm) high x 4" (100mm) wide. Lvs held 2 years; 4" x 1.5" (100 x 40mm), elliptic, broadly acute apex, rounded base, flat margins; dull and moderate olive green (147A) above; hairless. Shrub 2.5' (0.8m) high x 3' (0.9m) wide in 9 years; intermediate habit. Plant hardy to at least 0°F (-18°C). Flowering early May.

* The following unregistered name appears as a parent in the above descriptions:
(r) 'Goldprinz': Elepidote rhododendron: 'Festivo' X 'Alice Street'. G: Hachmann; fls are yellow.