Rhododendron lapponicum

(Linnaeus) Wahlenberg

Fl. Lapp., 104. 1812 ,.

Common names: Lapland rose-bay
Basionyms: 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"
Walter S. Judd +  and Kathleen A. Kron +
(Linnaeus) Wahlenberg +
less smooth +  and vertically furrowed +
not flaky +
Azalea lapponica +
2 cm20 mm <br />0.02 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (2 cm20 mm <br />0.02 m <br />) +
oblongelliptic;elliptic ovate or obovate +
coriaceous +
0.2cm;0.7cm +
scale-like +
unicellular-hairy +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
unicellular-hairy +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Lapland rose-bay +
1.4 cm14 mm <br />0.014 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
white +, rose +  and purple +
rotate to crateriform campanulate cylindric globose or urceolate +
0.75 cm7.5 mm <br />0.0075 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
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) +
0-1900 m +
undifferentiated +
fusiform +
unicellular-hairy +  and glabrous +
unicellular-hairy +  and ferruginous-lepidote +
erect;horizontal +
fragrant +
pendulous +  and erect +
usually ovoid;cylindric +
Arctic and alpine tundra, rocky barrens and heaths or thickets, raised beach ridges, sandy stream banks +
multicellular +
terminal +  and axillary +
persistent +
4.5mm +  and 8.5mm +
multicellular +  and unicellular +
eglandular-hairy +
elongate;plane;revolute +
parietal +, axile +  and placentation +
tenuinucellate +  and unitegmic +
unicellular-hairy +
0.25 cm2.5 mm <br />0.0025 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
scale-like +
reduced +
not sticky +
Flowering spring–summer. +
4-5-carpellate +
peltate +, glandular-peltate +  and multicellular +
ferruginous +  and golden +
conspicuous +
broad-rimmed +
distinct +
tailed +, flattened-ellipsoidal +  and fusiform +
unequal +
procumbent +  and prostrate +
creeping +  and sprawling +
prostrate +  and erect +
peltate +  and capitate +
straight +
unicellular-hairy +
Undefined tribe Empetraceae +
distinct +
Rhododendron lapponicum +
Rhododendron +
species +
expanding +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
unicellular-hairy +
evergreen +, deciduous +  and perennial +
heterotrophic +, autotrophic +  and mycotrophic +