Rhododendron macrophyllum D.Don ex G.Don

Pacific rhododendron (en)

Species

Angiosperms > Ericales > Ericaceae > Rhododendron

Characteristics

Shrubs or trees, to 5 m, sometimes rhizomatous. Stems: bark smooth to vertically furrowed, shredding; twigs with basally branched, crisped/matted, eglandular hairs, very quickly glabrate. Leaves persistent; petiole glabrous; blade elliptic to slightly ovate or obovate, (6-)8.5-14(-20) × 2.5-5.5(-7.5) cm, thick, coriaceous, margins entire, plane to revolute, glabrous, apex acute to obtuse or slightly acuminate, surfaces scattered eglandular-hairy (hairs branched basally, crisped, very quickly deciduous), abaxial surface ± smooth. Floral bud scales multicellular eglandular-hairy (hairs branched basally), and unicellular-hairy (hairs short to elongate) abaxially, margins eglandular-hairy (hairs branched). Inflorescences 10-20-flowered; bracts similar to bud scales. Pedicels 30-60 mm, glabrous. Flowers opening after development of leaves (of flowering shoots), erect to horizontal, fragrant; calyx lobes 1-1.5 mm, glabrous, except margins eglandular-and stipitate-glandular-hairy; corolla white to pink or rose-purple, with yellowish green spots on upper lobe, broadly campanulate, 24-48 mm, outer surface glabrous, petals connate, lobes 14-30 mm, tube gradually expanding into lobes, 10-23 mm; stamens 10, included, ± unequal, 16-37 mm. Capsules borne on erect pedicels, 13-25 × 4-7 mm, eglandular-hairy (hairs ferruginous, branched or unbranched) and, often, stipitate-glandular-hairy. Seeds without distinct tails, flattened portion of testa well developed at each end; testa expanded, dorsiventrally flattened, loose. 2n = 26.
Life form perennial
Growth form shrub
Growth support free-standing
Foliage retention evergreen
Sexuality hermaphrodite
Pollination -
Spread -
Mature width (meter) 2.5 - 4.0
Mature height (meter) 3.8 - 4.6
Root system -
Rooting depth (meter) 0.3
Root diameter (meter) -
Flower color
Blooming months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Fruit color -
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway c3

Environment

Light 5-6
Soil humidity 8-8
Soil texture -
Soil acidity 3-5
Soil nutriment -
Hardiness (USDA) 6-10

Usage

Uses material medicinal poison
Edible -
Therapeutic use Ceremonial Medicine (unspecified)
Human toxicity -
Animal toxicity -

Cultivation

Can be grown by cuttings or seedlings.
Mode cuttings seedlings
Germination duration (days) 50 - 90
Germination temperacture (C°) 12 - 15
Germination luminosity -
Germination treatment -
Minimum temperature (C°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Images

Leaf

Rhododendron macrophyllum leaf picture by Alessandro Susca (cc-by-sa)
Rhododendron macrophyllum leaf picture by Alessandro Susca (cc-by-sa)

Flower

Rhododendron macrophyllum flower picture by Daniel Barthelemy (cc-by-nc)
Rhododendron macrophyllum flower picture by Daniel Barthelemy (cc-by-nc)
Rhododendron macrophyllum flower picture by k sullivan (cc-by-sa)

Distribution

Rhododendron macrophyllum world distribution map, present in Canada and United States of America

Conservation status

Rhododendron macrophyllum threat status: Least Concern

Identifiers

LSID urn:lsid:ipni.org:names:332831-1
WFO ID wfo-0001047073
COL ID 4SGBB
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR) Link

Synonyms

Rhododendron macrophyllum