Rhododendron hookeri Nutt.

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 hookeri' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/rhododendron/rhododendron-hookeri/). Accessed 2020-08-04.

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.
apex
(pl. apices) Tip. apical At the apex.
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.
glaucous
Grey-blue often from superficial layer of wax (bloom).
mucro
Short straight point. mucronate Bearing a mucro.
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 hookeri' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/rhododendron/rhododendron-hookeri/). Accessed 2020-08-04.

Shrub or small tree, c.4 m; bark smooth; young shoots glabrous. Leaves 8-14 x 3-5 cm, broadly oblanceolate, base rounded; upper surface glabrous, lower surface with epidermis lacking papillae, glabrous except for large fasciculate hairs overlying the veins; petioles slightly winged, glabrous. Flowers 8-15, in a dense truss; calyx (5-)10-20 mm, cupular; corolla deep rose to crimson, with darker nectar pouches and a few flecks, tubular-campanulate, 35-45 mm; ovary and style glabrous. Flowering March-April. Royal Horticultural Society (1997)

Distribution  India Arunachal Pradesh

Habitat 2,500-3,700 m

RHS Hardiness Rating H5

Awards FCC 1933 (Hon. H.D. McLaren, Bodnant); flowers of the darkest red, with a large, similarly coloured calyx.

Conservation status Vulnerable (VU)

Taxonomic note The large fasciculate hairs on the veins of the lower surface of the leaves characterize this species. In cultivation the flowers are either a clear crimson or a muddy deep rose pink. Royal Horticultural Society (1997)

An evergreen shrub 10 to 14 ft high; young shoots glabrous. Leaves oval-oblong, rounded at both ends with a short mucro at the apex, 3 to 5 in. long, about half as much wide, green and glabrous above, rather glaucous beneath and glabrous except along the veins upon which, at fairly regular intervals, occur little tufts of down; stalk up to 118 in. long. Flowers produced in late March or April ten to fifteen in a truss, on stalks up to 1 in. long. Calyx cup-shaped, up to 78 in. long. Corolla blood-red sometimes pink, bell-shaped, 112 to 2 in. wide, five-lobed, the lobes rounded and deeply notched in the middle; stamens ten, quite glabrous; ovary and style glabrous, the latter longer than the stamens but shorter than the corolla. Bot. Mag., t. 4926. (s. and ss. Thomsonii)

Native of the Himalaya from Bhutan eastward, and of the Mishmi Hills; discovered by Booth in 1849 in an outer range just east of the Bhutan frontier, and introduced by him. For many years this handsome and richly coloured species was one of the rarest of rhododendrons; even now, although it is becoming more widely spread in gardens, it is still quite uncommon. It is related to R. thomsonii, but is well distinguished from that and all other known rhododendrons by the curious tufts of down scattered along the chief veins beneath the leaf, and nowhere else. It is grown out-of-doors, really successfully, in the southern and western maritime counties only, although 30 or 40 miles south of London it has survived pretty severe winters. In view of this tenderness it is interesting to note Booth’s record that, when and where he first collected it, frost and snow were very severe and continuous; also that it is associated in the wild with Pinus wallichiana, a perfectly hardy pine.

A hardier form of R. hookeri was introduced by Kingdon Ward in 1938 from the Poshing La in the Assam Himalaya.

R. hookeri was awarded a First Class Certificate when shown from Bodnant on March 21, 1933.

From the Supplement (Vol. V)

† R. subansiriense Chamberlain & Cox – Near to R. hookeri (and also to R. hylaeum and R. faucium), but differing from all these in the tomentose, glandular ovaries. Flowers scarlet as in R. hookeri, which it also resembles in its smooth, peeling bark. Discovered by Cox and Hutchison in the Apa Tani valley of the Assam Himalaya in 1965 and introduced by them. See further in Notes Roy. Bot. Gard. Edin., Vol. 36, p. 124 (1978).

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.