Rhododendron moulmainense Hook.

Species

Angiosperms > Ericales > Ericaceae > Rhododendron

Characteristics

Terrestrial shrub, 3-5 m, or small tree, with straight, erect branches. Branchlets glabrous, terete; internodes 2-8 cm. Leaves in ± terminal, 2-4-merous pseudowhorls, elliptic or mostly elliptic-lanceolate, rarely obovate-elliptic or oblong-oblanceolate, apex acute, base narrowed, ± coriaceous, glabrous, 6-12(-15) by (2.5-)3-5(-6) cm, midrib impressed above, much raised beneath, nerves 9-12 pairs, straight, spreading and ± parallel, initially slightly prominent or somewhat impressed, more conspicuously inarched in mature leaves above, prominent beneath, veins slightly or not visible; petiole often red in fresh specimens, somewhat winged, (6-)8—12(-15) mm. Inflorescences 2-4, each in the axil of one of the upper leaves; inflorescences 2-4-flowered. Floral buds ovoid-oblong, subacute, c. 2.5 by 0.8 cm. Outer perulae small and ovate, obtuse, inner ones gradually larger and ovate to ovate-oblong or obovate-oblong, all glabrous or rather faintly sericeous outside especially towards the tip, densely white-ciliate. Bracteoles linear, glabrous, up to 2.5 by 0.1 cm. Pedicels rather slender, glabrous, (1-)1.5-2.5 cm. Calyx very small, margin undulately lobed, glabrous. Corolla funnel-shaped, deeply 5-lobed, 3.5-4 cm long in all, tube 1-1.5 cm, base 5-saccate, 3-4 mm ø, lobes oblong, subacute, ± spreading, 2-2.5 by 0.5-0.9 cm, glabrous, mostly white with a yellow spot inside on the upper lobe, also rose or of a clear orchid-purple with a ± orange spot, rarely reddish, fragrant. Stamens normally 10 (sometimes a few more), ± as long as the corolla; filaments linear, hairy except the very base and upper half, occasionally entirely glabrous; anthers short-oblong, 2.5 by 1 mm. Disk glabrous. Ovary glabrous, cylindric, slightly 5-ribbed, mostly continuous (rarely abrupt) with the glabrous style, c. 3 cm long; stigma capitate. Capsule ovoid-fusiform, rather deeply 5 grooved, 2-2.5 by c. 0.6 cm, beaked by the persistent rest of the style even after the capsule is split into 5 rather thin, not twisted valves. Seeds flat, broad-oblong, very shortly and irregularly winged (not tailed) on both ends, c. 2 mm.
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Shrubs or small trees, 3–15 m tall; bark gray-brown, not peeling. Petioles stout, 10–15 mm, glabrous; leaf blade leathery, oblong-lanceolate or elliptic-lanceolate, 5–12 × 2.5–5 cm; base cuneate or broadly cuneate; margin revolute; apex acuminate to acute; both surfaces glabrous; lateral veins not reaching margin. Inflorescence subapical, 2-or 3-flowered. Pedicel 1–2 cm, glabrous; calyx lobes 5, shallowly undulate, small, glabrous; corolla narrowly funnelform, white, with a yellow blotch within, 4.3–5.5 cm, tube 15–20 × 3–4 mm in diam., lobes deeply divided, spreading, oblong-obovate, apex entire and rounded; stamens 10, unequal, 3.5–4 cm, slightly shorter than corolla, filaments flat, with silvery-white scurfy pubescence below middle; ovary long-cylindric, tapering into style, 5–10 mm, dark brown, glabrous; style ca. 5 cm, often shorter than corolla, slightly longer than stamens, glabrous. Capsule cylindric, apex acuminate, 35–60 × 4–6 mm; style persistent. Fl. Mar–Apr, fr. Jul–Dec.
A shrub or small tree. It grows 3-15 m tall. The bark is grey brown and does not peel. The leaves are oblong to sword shaped and 5-12 cm long by 3-5 cm wide. The base is wedge shaped and the edges curl under. The flowers are in groups of 2 or 3 towards the end of branches. They are funnel shaped and white with a yellow blotch.
Life form perennial
Growth form shrub
Growth support free-standing
Foliage retention evergreen
Sexuality hermaphrodite
Pollination -
Spread -
Mature width (meter) -
Mature height (meter) 3.0 - 15.0
Root system -
Rooting depth (meter) -
Root diameter (meter) -
Flower color -
Blooming months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Fruit color -
Fruiting months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Nitrogen fixer -
Photosynthetic pathway -

Environment

It is a tropical plant. It grows in open forests between 700-1,500 m above sea level in southern China. In Yunnan.
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Fl. May-Dec., fr.--05.
Light -
Soil humidity -
Soil texture -
Soil acidity -
Soil nutriment -
Hardiness (USDA) 9-12

Usage

Uses medicinal
Edible flowers
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

Mode -
Germination duration (days) 50 - 90
Germination temperacture (C°) 12 - 15
Germination luminosity -
Germination treatment -
Minimum temperature (C°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Images

Rhododendron moulmainense unspecified picture

Distribution

Rhododendron moulmainense world distribution map, present in China, Iceland, Lao People's Democratic Republic, Malaysia, Papua New Guinea, and Thailand

Conservation status

Rhododendron moulmainense threat status: Least Concern

Identifiers

LSID urn:lsid:ipni.org:names:332916-1
WFO ID wfo-0001229736
COL ID 4SGFM
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Rhododendron nematocalyx Rhododendron stenaulum Rhododendron oxyphyllum Rhododendron moulmainense Rhododendron klossii Rhododendron siamense Rhododendron leucobotrys Rhododendron pectinatum