Rhododendron ungernii Trautv.

TSO logo

Sponsor

Kindly sponsored by Peter Norris, enabling the use of The Rhododendron Handbook 1998

Credits

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

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

Genus

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.
apex
(pl. apices) Tip. apical At the apex.
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.
glabrous
Lacking hairs smooth. glabrescent Becoming hairless.
glandular
Bearing glands.
lanceolate
Lance-shaped; broadest in middle tapering to point.
obtuse
Blunt.
ovary
Lowest part of the carpel containing the ovules; later developing into the fruit.
style
Generally an elongated structure arising from the ovary bearing the stigma at its tip.

References

There are currently no active references in this article.

Credits

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

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

Shrub or small tree, 1-7 m; young shoots densely whitish-lanate-tomentose, bud scales deciduous. Leaves 11.5-21 x 3.5-6 cm, oblanceolate to obovate, apex usually rounded, acuminate, upper surface glabrous, lower surface covered with a dense whitish to fawn lanate tomentum composed of dendroid hairs; petioles lanate-tomentose and stalked-glandular at first, later glabrescent. Flowers 12-25, in a lax truss; calyx 5-9 mm; corolla white, sometimes flushed pink, with greenish flecks, funnel-campanulate, nectar pouches lacking, c.35 mm; ovary covered with brownish stipitate glands, also with a few whitish non-glandular hairs, style glabrous. Flowering June-July. Royal Horticultural Society (1997)

Distribution  GeorgiaTurkey NE

Habitat 1,200-1,850 m

RHS Hardiness Rating H6

Awards AM 1973 (Lord Aberconway and National Trust, Bodnant); flowers white inside, edged pale pink, pink outside, spotted green.

Conservation status Vulnerable (VU)

Taxonomic note Allied to R. smirnowii but differing in its glandular ovary. Royal Horticultural Society (1997)

An evergreen shrub or small tree up to 20 ft high in the wild; young shoots downy. Leaves narrow oblong, 3 to 6 in. long, one-third as wide, tapering at the base, the apex ending in a short, abrupt point; glabrous above, but covered beneath with pale brownish wool; stalk 34 in. long. Flowers in large trusses 6 in. through, opening in July; pedicels up to 158 in. long, hairy and glandular. Calyx-lobes five, lanceolate, covered with glandular hairs. Corolla broadly bell-shaped, with five rounded, slightly notched lobes, white to pale rose, 112 to 2 in. across. Stamens hairy at the base. Ovary glandular; style glabrous. Bot. Mag., t. 8332. (s. Ponticum ss. Caucasicum)

Native of the Artvin region of N.E. Asiatic Turkey and of bordering parts of Russia (Adzaria), at 2,500 to 6,000 ft; introduced to cultivation in 1886 by way of St Petersburg, having been discovered by Baron Ungern-Sternberg in the previous year. It was discovered and introduced at the same time as R. smirnowii, with which it has been much confounded. The leaves are much longer than in that species, up to almost 9 in. long on wild plants, and are abruptly narrowed at the apex to a mucronate tip (obtuse in R. smirnowii), the lobes of the corolla are not frilled, and the calyx-lobes are much longer. It is also taller-growing in the wild. It is hardy in Britain, but not so fine a species as R. smirnowii.


Feedback

A site produced by the International Dendrology Society.

For copyright and licence information, see the Licence page.

To contact the editors: info@treesandshrubsonline.org.