JARS v58n4 - American Rhododendron Society Plant Registry

American Rhododendron Society Plant Registry

The following rhododendron and azalea names, submitted through the North American registrar, were approved and added to the International Rhododendron Register prior to July 31, 2004 by the Royal Horticultural Society, International Cultivar Registration Authority for the genus Rhododendron . 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). The format for reporting parentage conforms with that now used by the ICRA. If the direction of the cross is known, the seed parent is followed by an "(s)". For the plant being described, seed and pollen parents are separated by an upper case "X". 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 flower and leaf measurements are reported in 5mm (0.2") increments for dimensions greater than 25mm (1").

(r) 'Canadian National': Elepidote rhododendron: 'Nova Zembla' (s) X unknown. H (1994) and N (2003): C.A. Warkentin; G (2000), and REG (2004): W. Warkentin family, all Fonthill, Ontario, Canada. Fls 18/ball truss, openly funnel-shaped, 2" (50mm) long x 2.5" (65mm) wide, with 5 wavy-edged lobes; buds fuchsia at base, shading to red/deep maroon, opening inside red to deep maroon at margins, changing to light pink at center, with deep maroon speckling on lower 2/3 of dorsal lobe; outside light fuchsia at base, shading to red/maroon; filaments and style medium pink; stigma maroon; anthers white. Calyx lobes less than 0.1" (c 2mm) long, fuchsia. Truss 5.5" (140mm) high x 6" (150mm) wide. Lvs held 2 years, 5" x 2.2" (125 x 55mm), elliptic, broadly acute apex, rounded base, wavy-edged margins; semi-glossy green above; hairless. Shrub 3.3' (1.0m) high x 3' (0.9m) wide in 9 years; intermediate habit. Plant and bud hardy to at least -15°F (-26°C). Late May.

(r) 'Crimson Flare': Elepidote rhododendron: 'Besse Howells' (s) X 'Catawbiense Boursault'. H (1996) and N (2003): Brandon Warkentin; G (2002), and REG (2004): W. Warkentin family, Fonthill, Ontario, Canada. Fls 15/ball truss, openly funnel-shaped, 2" (50mm) long x 2.2" (55mm) wide, with 5 frilly-edged lobes; mauve to purple cone-shaped buds, opening mauve throughout with a prominent crimson to maroon blotch inside, c 0.8" x 0.8" (c 20 x 20mm), on lower portion of dorsal lobe, and pink mid veins outside; filaments and style mauve; stigma crimson; anthers white. Calyx lobes less than 0.1" (c 1.5mm) long, light green. Truss 6" (150mm) high x 6" (150mm) wide. Lvs held 2 years, 4" x 1.8" (100 x 45mm), elliptic, broadly acute apex, rounded base, flat and down-curved margins; dull green above; hairless. Shrub 1.35' (0.4m) high x 1' (0.3m) wide in 7 years; intermediate habit. Plant and bud hardy to at least -15°F (-26°C). Late May.

(r) 'Michael Robert': Elepidote rhododendron: 'Fawn' (s) X 'Dot'. H (1955): Del James, Eugene, OR; G: Hendricks Park, Eugene, OR; N (2004), and REG (2004): Study Group of Eugene Chapter, ARS. Fls 8-11/dome truss, broadly funnel-shaped, c 2.2" (55mm) long x 3" (75mm) wide, with 7 wavy-edged lobes; lightly scented; moderate red (182A) in bud, opening pale greenish yellow (13D) throughout; unmarked. Truss 5" (125mm) high x 5" (125mm) wide. Lvs 5"-7" x 1.5"-1.8" (125-175 x 40-45mm), elliptic, obtuse apex, rounded base, flat margins; dull and moderate olive green (147A) above; hairless. Shrub 4' (1.2m) high x 4' (1.2m) wide in 10 years, open habit. Late April.

(r) 'Niagara Blush: Elepidote rhododendron: 'Nova Zembla' (s) X unknown. H (1994): C.A. Warkentin; N (2002): Jenna Warkentin; G (2000), and REG (2004): W. Warkentin family, all Fonthill, Ontario, Canada. Fls 11/ball truss, broadly funnel-shaped, 2" (50mm) long x 2.5" (65mm) wide, with 5 frilly edged lobes; deep rose in bud, opening rose pink throughout with a blotch of discrete crimson spots on the dorsal lobe extending upwards 25mm from the base, and the outside midribs flushed deep rose; style and filaments rose lilac; stigma peach; anthers bronze. Calyx lobes less than 0.1" (2mm) long, pink. Truss 4.5" (115mm) high x 5.5" (140mm) wide. Lvs held 2 years, 4.8" x 1.8" (120 x 45mm), elliptic, broadly acute apex, rounded base, flat to wavy margins; dull green above; hairless. Shrub 2.7’ (0.8m) high x 2’ (0.6m) wide in 9 years; intermediate habit. Plant and bud hardy to at least -15°F (-26°C). Early June.

(r) ‘Pink Sophia’: Elepidote rhododendron: ‘Nova Zembla’ (s) X unknown. H (1994): C.A. Warkentin; N (2003): Jenna Warkentin; G (2000), and REG (2004): W. Warkentin family, all Fonthill, Ontario, Canada. Fls 16/ball truss, openly funnel-shaped with margins slightly cupped inwards, 2” (50mm) long x 2.5” (65mm) wide, with 5 flat-edged lobes; ruby in bud, opening inside lilac pink with a pinkish white blotch, c 0.8”x0.8” (c 20 x 20mm), on the dorsal lobe, speckled with discrete maroon spots; outside lilac, the midribs flushed crimson; style bright pink; filaments lilac; stigma crimson; anthers white. Calyx lobes less than 0.1” (2mm) long, light green. Truss 4.5” (115mm) high x 5.5” (140mm) wide. Lvs held 2 years, 4.8” x 1.8” (120 x 45mm), elliptic, broadly acute apex, rounded base, down curved and wavy margins; dull green above; hairless. Shrub 3’ (0.9m) high x 2.2’ (0.65m) wide in 9 years; intermediate habit. Plant and bud hardy to at least -15°F (-26°C). Late May.