Rhododendron lapponicum |
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Lapland rhododendron, Lapland rose-bay |
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Habit | 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 oblong-elliptic 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. |
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. |
Floral | bud scales ferruginous-lepidote, sometimes also unicellular-hairy abaxially, margins ± ciliate, unicellular and multicellular, elongate eglandular-hairy. |
2n | = 26, 52. |
Rhododendron lapponicum |
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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 (0-6200 ft) |
Distribution |
AK; ME; NH; NY; WI; AB; BC; MB; NF; NS; NT; NU; ON; QC; YT; Greenland; Europe (Russia, Scandinavia); Asia (Siberia)
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Discussion | Rhododendron lapponicum is known to hybridize with R. tomentosum in Greenland, producing R. ×vanhoeffenii Abromeit. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 8, p. 462. |
Parent taxa | |
Sibling taxa | |
Synonyms | Azalea lapponica |
Name authority | (Linnaeus) Wahlenberg: Fl. Lapp., 104. 1812 , |
Web links |