Rhododendron meddianum Forr.

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

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

Genus

Infraspecifics

Other species in genus

Glossary

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.
bloom
Bluish or greyish waxy substance on leaves or fruits.
campanulate
Bell-shaped.
clone
Organism arising via vegetative or asexual reproduction.
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).
hybrid
Plant originating from the cross-fertilisation of genetically distinct individuals (e.g. two species or two subspecies).
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.
variety
(var.) Taxonomic rank (varietas) grouping variants of a species with relatively minor differentiation in a few characters but occurring as recognisable populations. Often loosely used for rare minor variants more usefully ranked as forms.

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Credits

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

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

Shrub, 1-2.3 m; bark slightly rough; young shoots glabrous. Leaves 8-11(-15) x 4.5-5.2(-8.2) cm, obovate to broadly elliptic, base rounded to more or less cuneate, entirely glabrous, lower epidermis green and lacking papillae; petioles glabrous. Flowers 6-10, in a lax truss; calyx fleshy, 3-12(-18) mm, cupular, reddish; corolla fleshy, deep rose to deep blackish crimson, tubular-campanulate, with nectar pouches, 40-65 mm; ovary glabrous to densely glandular and viscid, style glabrous. Flowering April. Royal Horticultural Society (1997)

Distribution  Myanmar NE China W Yunnan

Habitat 2,700-3,600 m

RHS Hardiness Rating H4

Conservation status Vulnerable (VU)

An evergreen, stoudy branched shrub up to 6 ft high, glabrous in all its parts; young shoots glaucous. Leaves oval or inclined to obovate, broadly tapered to rounded at the base, rounded and with a short mucro at the apex; 3 to 5 in. long, 2 to 3 in. wide; dark dull green above, paler green beneath; stalk stout, 12 to 114 in. long. Flowers in a terminal truss of five to ten, opening in March and April, on glandular, reddish stalks up to 1 in. long. Corolla deep crimson, tubular-campanulate, 212 in. long and wide, five-lobed, the lobes shallow, rounded and notched; stamens ten, with white stalks, shorter than the corolla. Ovary and style eglandular. Bot. Mag., t. 9636. (s. and ss. Thomsonii)

R. meddianum appears to be a local species, known only from the mountains between the eastern Irrawaddy and the Salween, near the borders between Yunnan and Burma. It was discovered by Forrest in 1917 on the Shweli-Salween divide at 10,000 to 11,000 ft. It is an eastern representative of the Himalayan R. thomsonii, with a similar bark, but with larger, less rounded leaves and usually longer corollas. According to Forrest’s field notes the colour of the flowers varies from deep crimson to almost black crimson, or even blue-black with a plumlike bloom on the outside. Many of the cultivated plants belong to the var. atrokermesinum Tagg, which really differs from the typical state only in having a densely glandular ovary, though the varietal epithet refers to the colour of the flowers in the wild plants, which according to Forrest is ‘deep purple crimson’ or ‘deep wine crimson’. Curiously enough, the usual flower-colour in cultivated plants, both of the typical state and of the variety, is a splendid crimson-scarlet.

R. meddianum is hardy in woodland south of London and makes a fine display in March or April, weather permitting. The var. atrokermesinum received an Award of Merit when shown by Olaf Hambro, Logan, Wigtownshire, on April 13, 1954. The clone ‘Machrie’, which received the same award on April 13, 1965, is now considered to be a hybrid of R. meddianum, not the true species.


var. atrokermesinum Tagg

Ovary densely glandular and viscid.

Awards AM 1954 (R.O. Hambro, Logan House, Stranraer); flowers light red, with a little dark spotting on upper lobes. AM 1965 (National Trust for Scotland, Brodick Castle Gardens) to a clone ‘Machrie’; this is now regarded as a hybrid of R. meddianum. AM 1977 (National Trust for Scotland, Brodick Castle Gardens) to a clone ‘Bennan’; flowers red, with darker markings.

This species resembles R. thomsonii but may be distinguished by characters of the lower leaf epidermis.


var. meddianum

Ovary more or less glabrous.

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