Rhododendron columbianum

(Piper) Harmaja

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

Common names: Western Labrador tea
Basionyms: 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

Distribution

V8 897-distribution-map.gif

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

Discussion

Selected References

None.

Lower Taxa

None.

"broad" is not a number. "broad" is not a number. "broad" is not a number."elongated" is not a number.

... more about "Rhododendron columbianum"
unicellular-hairy +
Walter S. Judd +  and Kathleen A. Kron +
(Piper) Harmaja +
furrowed +  and smooth +
not flaky +
Ledum columbianum +  and Ledum glandulosum +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
2 cm20 mm <br />0.02 m <br /> (8 cm80 mm <br />0.08 m <br />) +
ovate;lanceolate +
coriaceous +
1.5cm;3cm +
scale-like +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Western Labrador tea +
white +  and cream +
rotate to crateriform campanulate cylindric globose or urceolate +
0.2 cm2 mm <br />0.002 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
Alta. +, B.C. +, Calif. +, Colo. +, Idaho +, Mont. +, Nev. +, Oreg. +, Utah +, Wash. +  and Wyo. +
0-3500 m +
undifferentiated +
fusiform +
not noticeable +
usually ovoid;cylindric +
Bogs, swamps, stream margins, sometimes on well-drained sites +
multicellular +
ferruginous +
long-crisped +
terminal +  and axillary +
persistent +
connate +  and distinct +
unicellular-hairy +  and glabrous +
glabrous +, stipitate-glandular-hairy +  and unicellular-hairy +
parietal +, axile +  and placentation +
tenuinucellate +  and unitegmic +
multicellular +  and long-stalked +
glandular-hairy +
0.4 cm4 mm <br />0.004 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
scale-like +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
reduced +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
not sticky +
Flowering spring-mid summer. +
4-5-carpellate +
Ann. Bot. Fenn. +
peltate +, unicellular +  and glandular-peltate +
ferruginous +
long-crisped +
distinct +
tailed +, flattened-ellipsoidal +  and fusiform +
procumbent +  and prostrate +
creeping +  and sprawling +
peltate +  and capitate +
straight +
Rhododendron neoglandulosum +
Rhododendron columbianum +
Rhododendron +
species +
unicellular-hairy +
papillate +
evergreen +, deciduous +  and perennial +
tree +  and shrub +
heterotrophic +, autotrophic +  and mycotrophic +