Rhododendron virgatum Hook. f.

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Article from Bean's Trees and Shrubs Hardy in the British Isles

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'Rhododendron virgatum' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/rhododendron/rhododendron-virgatum/). Accessed 2020-01-21.

Genus

Synonyms

  • R. oleifolium Franch.
  • R. sinovirgatum Balf. f., nom. inedit.

Infraspecifics

Other species in genus

Glossary

calyx
(pl. calyces) Outer whorl of the perianth. Composed of several sepals.
corolla
The inner whorl of the perianth. Composed of free or united petals often showy.
ovary
Lowest part of the carpel containing the ovules; later developing into the fruit.
Tibet
Traditional English name for the formerly independent state known to its people as Bod now the Tibet (Xizang) Autonomous Region of the People’s Republic of China. The name Xizang is used in lists of Chinese provinces.
axil
Angle between the upper side of a leaf and the stem.
bud
Immature shoot protected by scales that develops into leaves and/or flowers.
corolla
The inner whorl of the perianth. Composed of free or united petals often showy.
glabrous
Lacking hairs smooth. glabrescent Becoming hairless.
glaucous
Grey-blue often from superficial layer of wax (bloom).
lanceolate
Lance-shaped; broadest in middle tapering to point.
style
Generally an elongated structure arising from the ovary bearing the stigma at its tip.
subspecies
(subsp.) Taxonomic rank for a group of organisms showing the principal characters of a species but with significant definable morphological differentiation. A subspecies occurs in populations that can occupy a distinct geographical range or habitat.
synonym
(syn.) (botanical) An alternative or former name for a taxon usually considered to be invalid (often given in brackets). Synonyms arise when a taxon has been described more than once (the prior name usually being the one accepted as correct) or if an article of the International Code of Botanical Nomenclature has been contravened requiring the publishing of a new name. Developments in taxonomic thought may be reflected in an increasing list of synonyms as generic or specific concepts change over time.

References

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Credits

Article from Bean's Trees and Shrubs Hardy in the British Isles

Recommended citation
'Rhododendron virgatum' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/rhododendron/rhododendron-virgatum/). Accessed 2020-01-21.

Small shrub, 0.3-2.5 m; young shoots scaly Leaves 1.8-8 x 0.5-2 cm, narrowly oblong or oblong-elliptic, apex acute to rounded, upper surface with scales, especially on midrib and at base, lower surface densely covered with brown to dark brown peltate scales. Flowers 1(-2), in an inflorescence borne in the axils of the upper leaves; calyx lobes 2-3 mm, sometimes ciliate; corolla white to deep pink or mauve, funnel-shaped, 15-37 mm, outer surface of tube sparsely scaly and pubescent; stamens 10; ovary densely scaly, impressed below the declinate style that is scaly and/or pilose towards base. Flowering April-May. Royal Horticultural Society (1997)

Distribution  BhutanChina S Tibet, Yunnan India Sikkim, Arunachal Pradesh

Habitat 2,000-4,000 m

RHS Hardiness Rating H4

Conservation status Least concern (LC)

An evergreen shrub up to 8 ft high in the wild, with slender branches covered when young with brown scales. Leaves 1 to 3 in. long, 38 to almost 1 in. wide, narrow-elliptic or oblong-lanceolate, tapered or somewhat abruptly narrowed at both ends, dark green, glabrous and sometimes scaly above, underside paler green, sometimes slightly glaucous, sprinkled with shining brown scales; leaf­stalk 18 to 34 in. long. Flowers produced in April singly or in pairs from the uppermost leaf-axils on the previous season’s growths, bud-scales persisting during flowering and concealing the pedicels, which are up to 38 in. long. Calyx shortly five-lobed, usually scaly. Corolla funnel-shaped, 34 to 112 in. long, with five rounded, spreading lobes, varying in colour from white to various shades of purple or rose, scaly and usually more or less downy on the outside. Stamens ten, downy. Ovary scaly; style downy in the lower half or glabrous, sometimes scaly. Bot. Mag., tt. 5060, 8802. (s. Virgatum)

R. virgatum is a species of wide range, from E. Nepal, through Sikkim (where J. D. Hooker discovered it in 1849) as far east as Yunnan, where Delavay collected the type of R. oleifolium around 1884. It was introduced by Hooker in 1850 and reintroduced by Forrest (as R. oleifolium) in 1906. There have been several sendings since then, the most recent being by the University of North Wales expedition to E. Nepal (B. L. & M. 298).

Although it has been found as high as 12,500 ft, R. virgatum is not a very hardy species and is mainly confined in the wild to elevations of 7,000 to 10,000 ft, and prefers open, dry sunny places or thin pine woodland. It is uncommon in cultivation.

R. virgatum is the only member of the series to which it gives its name. Of the two species once grouped with it, R. oleifolium is now considered to be synonymous and R. racemosum has been transferred to the Scabrifolium series. From that series R. virgatum differs in having the flowers solitary in each leaf-axil, or at the most in pairs. The glabrous leaves distinguish it from all members of that series except R. racemosum and R. hemitrichotum, and they have the leaves glaucous beneath; in R. virgatum the leaves are green beneath.

From the Supplement (Vol. V)

The synonym R. oleifolium (page 798) should be deleted.

subsp. oleifolium (Franch.) Cullen R. oleifolium Franch. – Flowers smaller (corolla to 1 in. long against 1 to 112 in. in the typical subspecies), white or pink (against pale to deep pink or mauve). It has on the whole a more easterly distribution than the typical subspecies, not occurring further west than south-east Tibet.


subsp. oleifolium (Franch.) Cullen

Synonyms
R. oleifolium Franch.

Corolla 15-25mm, tube 8-15mm, white or pink.

Distribution China (SE Tibet, W & N Yunnan).

Habitat 2,000-4,000m.

This is a distinctive species on account of the axillary inflorescences.

subsp. virgatum

Corolla 25-37mm, tube 11-20mm, pale or deep pink to mauve.

Distribution Nepal, India (Sikkim, Arunachal Pradesh), Bhutan, China (S & SE Tibet).

Habitat 2,500-3,800m.

Awards AM 1973 (Maj. A.E. Hardy, Sandling Park, Kent); flowers white.

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