familyEricaceae
subfamilyEricaceae subfam. Ericoideae
genusRhododendron
speciesRhododendron lapponicum

Rhododendron lapponicum

(Linnaeus) Wahlenberg

Fl. Lapp., 104. 1812 ,.

Walter S. Judd, Kathleen A. Kron
Common names: Lapland rose-bay
Basionym: Azalea lapponica Linnaeus Sp. Pl. 1: 151. 1753
Treatment appears in FNA Volume 8. Treatment on page 462. Mentioned on page 372, 455, 456, 460, 461.

Shrubs, to 0.5 (–0.7) m, rhizomatous. Stems prostrate to erect; bark ± smooth to vertically furrowed, shredding; twigs with straw-colored to ferruginous, multicellular, broad-rimmed, peltate scales and unicellular-hairy. Leaves persistent; petiole with broad-rimmed, glandular-peltate scales; blade oblongelliptic to elliptic, ovate, or obovate, 0.4–2 (–2.5) × 0.2–0.7 (–0.9) cm, coriaceous, margins entire, plane to revolute, with broad-rimmed scales, apex obtuse to rounded or mucronate, surfaces with conspicuous, straw-colored or golden to ferruginous, broad-rimmed, glandular-peltate scales and unicellular-hairy abaxially. Floral bud-scales ferruginous-lepidote, sometimes also unicellular-hairy abaxially, margins ± ciliate, unicellular and multicellular, elongate eglandular-hairy. Inflorescences fasciculate racemes, 3–6-flowered; bracts similar to bud-scales. Pedicels 2.5–14 mm, with ferruginous scales and often unicellular-hairy. Flowers opening before development of leaves, erect to horizontal, fragrant; calyx lobes 0.5–2 mm, with ferruginous scales and unicellular-hairy, margins ciliate, unicellular and multicellular eglandular-hairy; corolla rose to purple, sometimes white, without blotch, broadly funnelform, (6.5–) 7.5–14 (–15) mm, glabrous on outer surface, petals connate (for 3/4+ their lengths), lobes 4.5–8.5 mm, tube gradually expanding into lobes, 1.5–6.5 mm; stamens 5–10, slightly exserted, ± unequal, 7–13 mm; filaments glabrous or proximally unicellular-hairy. Capsules borne on erect pedicels, 4–7 × 2–3 mm, with ferruginous, peltate scales and unicellular-hairy. Seeds without distinct tails; testa closely appressed. 2n = 26, 52.


Phenology: Flowering spring–summer.
Habitat: Arctic and alpine tundra, rocky barrens and heaths or thickets, raised beach ridges, sandy stream banks
Elevation: 0-1900 m

Distribution

V8 903-distribution-map.gif

Greenland, Alta., B.C., Man., Nfld. and Labr. (Nfld.), N.W.T., N.S., Nunavut, Ont., Que., Yukon, Alaska, Maine, N.H., N.Y., Wis., Europe (Russia), Europe (Scandinavia), Asia (Siberia)

Discussion

Rhododendron lapponicum is known to hybridize with R. tomentosum in Greenland, producing R. ×vanhoeffenii Abromeit.

Selected References

None.

Lower Taxa

None.
... more about "Rhododendron lapponicum"
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2n chromosome quantity
52 +  and 26 +
Abaxial groove presence
absent +
Androecium position
hypogynous +
Anther dehiscence
dehiscent +
Anther development
inverted +
Apex shape
obtuse +  and rounded or mucronate +
Author
Walter S. Judd +  and Kathleen A. Kron +
Authority
(Linnaeus) Wahlenberg +
Bark architecture
less smooth +  and vertically furrowed +
Bark fragility
not flaky +
Basionyms
Azalea lapponica +
Blade atypical length
2 cm20 mm <br />0.02 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
Blade atypical width
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
Blade length
0.4 cm4 mm <br />0.004 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Blade shape
oblongelliptic;elliptic ovate or obovate +
Blade texture
coriaceous +
Blade width
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Bract height or length or size
much shorter +
Bracteole coloration
brownish +
Bracteole position
basal +
Bracteole quantity
2 +
Bracteole shape
scale-like +
Calyx lobe pubescence
unicellular-hairy +
Calyx lobe some measurement
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Capsule length
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Capsule pubescence
unicellular-hairy +
Capsule width
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Common name
Lapland rose-bay +
Compound odor
aromatic +
Compound presence
absent +
Corolla atypical some measurement
1.4 cm14 mm <br />0.014 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Corolla coloration
white +, rose +  and purple +
Corolla duration
deciduous +
Corolla presence
absent +
Corolla pubescence
glabrous +
Corolla quantity
rotate to crateriform campanulate cylindric globose or urceolate +
Corolla shape
funnel;rotate;campanulate +
Corolla some measurement
0.75 cm7.5 mm <br />0.0075 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
Depression prominence
slight +
Distribution
Greenland +, Alta. +, B.C. +, Man. +, Nfld. and Labr. (Nfld.) +, N.W.T. +, N.S. +, Nunavut +, Ont. +, Que. +, Yukon +, Alaska +, Maine +, N.H. +, N.Y. +, Wis. +, Europe (Russia) +, Europe (Scandinavia) +  and Asia (Siberia) +
Elevation
0-1900 m +
Embryo course
straight +
Embryo prominence
undifferentiated +
Embryo shape
fusiform +
Embryo size
minute +
Endosperm architecture
cellular +
Endosperm quantity
abundant +
Endosperm texture
fleshy +
Filament fusion
distinct +
Filament pubescence
unicellular-hairy +  and glabrous +
Floral bud-scale pubescence
unicellular-hairy +  and ferruginous-lepidote +
Flower architecture or arrangement or growth form
solitary +
Flower architecture or shape
symmetric +
Flower development
erect;horizontal +
Flower odor
fragrant +
Flower orientation
pendulous +  and erect +
Flower reproduction
bisexual +
Fruit architecture
capsular +
Fruit dehiscence
septicidal +
Fruit shape
usually ovoid;cylindric +
Habitat
Arctic and alpine tundra, rocky barrens and heaths or thickets, raised beach ridges, sandy stream banks +
Hair architecture
multicellular +
Hair presence
absent +
Hypanthium presence
absent +
Illustration copyright
Flora of North America Association +
Illustrator
Yevonn Wilson-Ramsey +
Inflorescence architecture
3-6-flowered +
Inflorescence arrangement
fascicles +
Inflorescence height or length or size
short +
Inflorescence position
terminal +  and axillary +
Inflorescence position or structure subtype
terminal +
Leaf architecture
simple +
Leaf arrangement
alternate +
Leaf duration
persistent +
Leaf position
cauline +
Lobe height or length or size
shorter +
Lobe some measurement
? (?) +  and ? (?) +
Margin architecture
multicellular +  and unicellular +
Margin architecture or pubescence or shape
ciliate +
Margin architecture or shape
entire +
Margin pubescence
eglandular-hairy +
Margin shape
elongate;plane;revolute +
Nectary disc presence
absent +
Number of lower taxa
0 +
Ovary architecture
furrowed +
Ovary architecture or structure in adjective form
5[-18]-locular +
Ovary arrangement
parietal +, axile +  and placentation +
Ovary placentation
axile +
Ovary position
superior +
Ovary shape
lobed +
Ovule architecture
tenuinucellate +  and unitegmic +
Ovule orientation
anatropous +
Panicle arrangement
fascicles +
Pedicel orientation
erect +
Pedicel pubescence
unicellular-hairy +
Pedicel some measurement
0.25 cm2.5 mm <br />0.0025 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
Perianth position
hypogynous +
Perula coloration
brownish +
Perula condition or texture
dry +
Perula presence
absent +
Perula shape
scale-like +
Petal atypical quantity
5 (9) +
Petal fusion
connate +
Petal presence
absent +
Petal quantity
5 +
Petal size
reduced +
Petal texture
not sticky +
Petiole presence
absent +
Phenology
Flowering spring–summer. +
Pistil architecture
4-5-carpellate +
Pistil quantity
1 +
Pith architecture
solid +
Publication title
Fl. Lapp., +
Publication year
1753 +
Raceme architecture or arrangement
fasciculate +
Raceme shape
rounded +
Reference
None +
Scale architecture
peltate +, glandular-peltate +  and multicellular +
Scale coloration
ferruginous +  and golden +
Scale prominence
conspicuous +
Scale relief
broad-rimmed +
Seed architecture
winged +
Seed atypical quantity
10 (100) +
Seed coloration
tan;yellowish-brown or brown +
Seed fusion
distinct +
Seed quantity
2;300 +
Seed shape
tailed +, flattened-ellipsoidal +  and fusiform +
Sepal atypical quantity
5 (9) +
Sepal fusion
connate +
Sepal presence
absent +
Sepal quantity
5 +
Slit height or length or size
short +
Source xml
https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V8/V8 903.xml +
Stamen atypical quantity
12 (20) +
Stamen position
exserted +
Stamen quantity
5;10 +
Stamen size
unequal +
Stamen some measurement
0.7 cm7 mm <br />0.007 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
Stem growth form
procumbent +  and prostrate +
Stem growth form or orientation
creeping +  and sprawling +
Stem orientation
prostrate +  and erect +
Stem pubescence
hairy +  and glabrous +
Stigma architecture
peltate +  and capitate +
Stigma architecture or shape
capitate +
Stigma quantity
1 +
Stigma shape
5-lobed +
Stipule presence
absent +
Style architecture
hollow +
Style course
straight +
Style orientation
declinate +
Style quantity
1 +
Surface pubescence
unicellular-hairy +
Synonyms
Undefined tribe Empetraceae +
Tail fusion
distinct +
Taxon family
Ericaceae +
Taxon name
Rhododendron lapponicum +
Taxon parent
Rhododendron +
Taxon rank
species +
Testa architecture or pubescence or relief
smooth +
Testa fixation or orientation
appressed +
Testa width
thin +
Tube size
expanding +
Tube some measurement
0.15 cm1.5 mm <br />0.0015 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
Twig pubescence
unicellular-hairy +
Volume
Volume 8 +
Whole organism architecture
rhizomatous +
Whole organism atypical some measurement
50 cm500 mm <br />0.5 m <br /> (70 cm700 mm <br />0.7 m <br />) +
Whole organism duration
evergreen +, deciduous +  and perennial +
Whole organism growth form
shrub +
Whole organism nutrition
heterotrophic +, autotrophic +  and mycotrophic +
Whole organism some measurement
0m (0.5m) +
X chromosome quantity
13 +