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Rhododendron tomentosum
Rhododendron tomentosum
Harmaja
Family:
Ericaceae
Images
not available
Flora of North America
Resources
Walter S. Judd, Kathleen A. Kron in Flora of North America (vol. 8)
Shrubs,
to 0.5 m, rhizomatous.
Stems
creeping or prostrate; bark ± smooth; twigs unicellular-hairy and with flattened, glandular scales, scales often obscured by dense, ferruginous, long-crisped, multicellular hairs.
Leaves
persistent, (fragrant when crushed); petiole with unicellular and/or peltate scales and, sometimes, ferruginous, long-crisped hairs; blade ± linear, 2-5 × 1-4 cm (often much longer than wide), coriaceous, margins entire, revolute, glabrous, apex acute, abaxial surface with sparse to dense, glandular-peltate scales without broad rim, scales often obscured by dense (to sparse), ferruginous, long-crisped, multicellular hairs sometimes forming dense, ± uniform mat, adaxial surface rugose with scattered, lepidote scales and sometimes also with white, unicellular hairs along impressed midrib, midrib usually lanate.
Floral bud scales
with lepidote scales and unicellular-hairy abaxially, margins unicellular-hairy.
Inflorescences
slightly rounded, 10-35-flowered; bracts lepidote abaxially, margins ciliate, long-crisped-hairy, sometimes also unicellular-hairy.
Pedicels
5-26 mm, sparsely eglandular-hairy (hairs ferruginous, elongated), with 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, not fragrant; calyx lobes ca. 1 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 often densely unicellular-hairy, petals appearing distinct or only slightly connate basally, lobes 5-7 mm; stamens 10, exserted, ± equal, 4.4-8.5 mm.
Capsules
borne on apex of sharply recurved pedicels, 2.5-5 × 1-3 mm (only slightly longer than wide), with sparse to dense, lepidote scales, acropetally dehiscent.
Seeds
somewhat elongated beyond narrow ends; testa closely appressed.
2
n
= 26, 52. Flowering spring-summer. Bogs, muskeg, tundra, raised beach ridges; 0-1800 m; Greenland; Alta., B.C., Man., Nfld. and Labr. (Nfld.), N.W.T., Nunavut, Ont., Que., Sask., Yukon; Alaska; Europe; Asia.
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