 
 
Rhododendron radians var. radians
Section Euvireya: Subsection Solenovireya
Height - 2m - terrestrial
Leaves - ovate - 5.5 x 2.5cm
Flowers - trumpet-shaped - 7.5cm - up to 20 per umbel
Location - Indonesia: Sulawesi: Mt. Sinadji - 1500-2000m
Epithet - "radiating outwards"
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Rhododendron rarilepidotum
Section Euvireya: Subsection Euvireya
Height - 4m - terrestrial
Leaves - elliptic - 9 x 3.5cm
Flowers - broadly funnel-shaped - 2.5cm - up to 12 per
umbel
Location - Indonesia: Sumatra: Gajo Lands; East Coast;
West Coast, Mt. Kaba - 1000-2500m
Epithet - "with small scales"
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Rhododendron rarum
Section Phaeovireya
Height - 1.5m - epiphytic
Leaves - narrowly elliptic - 6.0 x 1.5cm - scaly
Flowers - curved cylindrical - 3.5cm - usually solitary
or in pairs
Location - Papua New Guinea: widespread along the Central
& Bismarck Ranges - 1585-3350m
Epithet - "rare", alluding to its sparsely
branched habit.
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Rhododendron renschianum
Section Euvireya: Subsection Euvireya
Height - 0.5m - terrestrial
Leaves - elliptic - 7.0 x 3.5cm
Flowers - narrowly-funnel-shaped - 4cm - up to 8 per
umbel
Location - Indonesia: Lesser Sunda Islands: Flores:
Mt. Geli Mutu, Mt. Mandaswai & Mt. Desu
1500-2300m
Epithet - after Mrs Ilse Rensch-Maier, who first collected
his species.
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Rhododendron retivenium
Section Euvireya: Subsection Euvireya
Height - to 6m - usually terrestrial
Leaves - narrowly elliptic - 16 x 5cm
Flowers - funnel-shaped - 6.4cm - up to 7 per umbel
- scented
Location - Malaysia: Sabah: Mt. Kinabalu & Mt. Alab
- 2000-2700m
Epithet - alluding to the distinct veination of the
leaves.
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Rhododendron retusum var. retusum
Section Discovireya
Height - to 7m - mostly terrestrial
Leaves - obovate - 6 x 2cm
Flowers - narrowly funnel-shaped - 3.5cm - up to 10
per umbel
Location - Indonesia: Sumatra & Java - 1350-3400m
Epithet - "with a rounded, notched tip", referring
to the leaf tips.
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Rhododendron rhodochroum
Section Phaeovireya
Height - 1.5m - terrestrial
Leaves - broadly elliptic - 7.5 x 5cm
Flowers - zygomorphic, curved tubular - 5.5cm - up to
8 per umbel
Location - W. New Guinea: Lake Habbema - 2400-4000m
Epithet - "rhodo"= rose; "chroum"=
coloured, alluding to the flower colour.
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Rhododendron rhodoleucum
Section Euvireya: Subsection Solenovireya
Height - To 4m - usually terrestrial
Leaves - broadly elliptic - 7 x 6cm
Flowers - trumpet-ventricose, usually slightly curved
- 9.3cm - up to 7 per umbel - scented
Location - Papua New Guinea: Milne Bay District, Maneau
Range - 2290-2750m
Epithet - "pale red" alluding to flower colour.
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Rhododendron rhodopus
Section Euvireya: Subsection Euvireya
Height - 2m - terrestrial
Leaves - narrowly ovate - 16 x 4.5cm
Flowers - tubular-funnel-shaped - 7cm - up to 9 per
umbel - scented
Location - Indonesia: Sulawesi: Latimodjong Range -
2800-3000m
Epithet - alluding to the red pedicels seen on this
species.
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Rhododendron rhodostomum
Section Euvireya: Subsection Malesia
Height - 0.6m - epiphytic
Leaves - elliptic - 3.5 x 2.1cm
Flowers - tubular - 2.7cm - usually solitary
Location - Papua New Guinea: Mt.Saruwaged & Rawlinson
Range - 1525-3655m
Epithet - "rose mouth", alluding to the flower
colour.
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Rhododendron robinsonii
Section Euvireya: Subsection Euvireya
Height - 2.5m - usually epiphytic
Leaves - elliptic - 16 x 6cm
Flowers - funnel-shaped - 3.5cm - up to 12 per umbel
Location - Malaysia: Peninsula: Perak to Selangor -
1035-1830m
Epithet - after H. C. Robinson, 1874-1929
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Rhododendron roseiflorum
Section Euvireya: Subsection Solenovireya
Height - 3m - terrestrial
Leaves - elliptic to ovate - 8.5 x 2.9cm
Flowers - tubular, curved - 7.8cm - up to 8 per umbel
Location - W. New Guinea: near Mt Jaya (Carstensz) & Mt Trichora (Wilhelmina)
- 2100-2700m
Epithet - "with red coloured flowers", alluding to the pink flush on the flowers.
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Rhododendron rousei
Section Euvireya: Subsection Malesia
Height - 1m - terrestrial
Leaves - elliptic - 5 x 3cm
Flowers - funnel-shaped - 2.8cm - up to 6 per umbel
Location - Philippines: Sibuyan Island, Mt. Giting Giting
- 1300m
Epithet - after Dr. J. Rouse of Australia for his dedicated
work with vireyas.
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Rhododendron rubellum
Section Phaeovireya
Height - 5m - terrestrial
Leaves - broadly elliptic - 10 x 4cm
Flowers - tubular - 6.5cm - up to 8 per umbel
Location - Papua New Guinea: Wharton & Owen Stanley
Ranges - 2050-3100m
Epithet - "reddish", referring to the flower
colour.
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Rhododendron rubineiflorum
Section Euvireya: Subsection Linnaeopsis
Height - 0.2m - epiphytic or on peat banks
Leaves - elliptic to ovate - 1.0 x 0.6cm
Flowers - broadly campanulate - 2.0cm - mainly solitary
Location - Indonesia: W.New Guinea: Mt. Carstenz; Papua
New Guinea: widespread
2600-3400m
Epithet - "with ruby-red flowers"
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Rhododendron rugosum
Section Euvireya: Subsection Euvireya
Height - 8m - mostly terrestrial
Leaves - elliptic - 12 x 5.5cm - strongly impressed
midrib and lateral veins
Flowers - cylindrical - 3cm - up to 14 per umbel
Location - Malaysia: Sabah: Mt. Kinabalu, Mt. Trus Madi
& Mt. Alab - 2000-3500m
Epithet - "wrinkled", referring to the leaves
of this species.
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Rhododendron rushforthii
Section Pseudovireya
Height - 1.5m - terrestrial
Leaves - elliptic - 11 x 4.2cm - distinctive bluish-green
Flowers - shortly campanulate - 1.5cm - up to 8 per
umbel
Location - Vietnam: Laokai Province, Sapa District -
1800m
Epithet - after Keith Rushforth, plant collector.
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Rhododendron ruttenii
Section Euvireya: Subsection Solenovireya
Height - to 2m - terrestrial
Leaves - obovate - 8 x 4.5cm
Flowers - trumpet-shaped - 5cm - up to 8 per umbel
Location - Indonesia: Maluku: C.Seram: Mt.Murkele, Mt.
Binaia - 1900-2500m
Epithet - after L.Rutten, Dutch geologist who collected
in Malaysia.
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