Rhododendron columbianum

(Piper) Harmaja

Ann. Bot. Fenn. 27: 203. 1990,.

Common names: Western Labrador tea
Basionym: Ledum columbianum Piper Contr. U.S. Natl. Herb. 11: 441. 1906 Ledum glandulosum Nuttall 1843
Synonyms: Rhododendron neoglandulosum Harmaja
Treatment appears in FNA Volume 8. Treatment on page 459. Mentioned on page 455, 456, 460.

Shrubs or trees, to 2 m, rhizomatous. Stems: bark smooth, sometimes peeling or shredding with age; twigs unicellular-hairy, papillate, with flattened, glandular scales (lepidote). Leaves persistent, (fragrant when crushed); petiole with glandular-peltate scales without broad rim and few, ferruginous, long-crisped hairs; blade (white or pale green abaxially), ovate to lanceolate, (1–)2–8 × 1.5–3 cm, coriaceous, margins entire, plane, glabrous, apex usually acute, abaxial surface sparsely to densely papillate, with few, ferruginous, long-crisped hairs and glandular-peltate scales without broad rim, adaxial surface with scattered lepidote scales and/or papillae, sometimes also unicellular-hairy along midrib. Floral bud scales with peltate scales without broad rim and unicellular-hairy abaxially, margins unicellular-hairy. Inflorescences slightly rounded, 10–35-flowered; bracts lepidote abaxially, margins ciliate, unicellular-hairy. Pedicels 4–25 mm, with dense to sparse, ferruginous, long-crisped, unicellular and/or peltate scales, sometimes also long-stalked, multicellular glandular-hairy. Flowers radially symmetric, opening after leaves (of flowering shoots), ± erect, fragrance not noticeable at mid day; calyx lobes (often reflexed in fruit), ± 1–1.5 mm, outer surface densely to sparsely unicellular-hairy (hairs tan) and multicellular stipitate-glandular-hairy (hairs red) on margins; corolla white to cream, without blotch, ± rotate, 2–8 mm, inner surface hairy proximally, outer surface glabrous, petals appearing distinct or only slightly connate basally, lobes (4–)5–7 mm; stamens (8–)10(–12), exserted, ± equal, 4.5–8.4 mm. Capsules borne on recurved pedicels, 2.5–5 × 2–6 mm (only slightly longer than wide), glabrous, acropetally dehiscent. Seeds somewhat elongated beyond narrow ends; testa closely appressed. 2n = 26.

Phenology: Flowering spring-mid summer.
Habitat: Bogs, swamps, stream margins, sometimes on well-drained sites
Elevation: 0-3500 m


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Alta., B.C., Calif., Colo., Idaho, Mont., Nev., Oreg., Utah, Wash., Wyo.


Selected References


Lower Taxa

... more about "Rhododendron columbianum"
Walter S. Judd +  and Kathleen A. Kron +
(Piper) Harmaja +
Ledum columbianum +  and Ledum glandulosum +
Western Labrador tea +
Alta. +, B.C. +, Calif. +, Colo. +, Idaho +, Mont. +, Nev. +, Oreg. +, Utah +, Wash. +  and Wyo. +
0-3500 m +
Bogs, swamps, stream margins, sometimes on well-drained sites +
Flowering spring-mid summer. +
Ann. Bot. Fenn. +
Rhododendron neoglandulosum +
Rhododendron columbianum +
Rhododendron +
species +