Difference between revisions of "Rhododendron albiflorum"
Fl. Bor.-Amer. 2: 43, plate 133. 1834 ,.
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|common_names=White rhododendron | |common_names=White rhododendron | ||
| + | |special_status={{Treatment/ID/Special_status | ||
| + | |code=E | ||
| + | |label=Endemic | ||
| + | }} | ||
|basionyms= | |basionyms= | ||
|synonyms={{Treatment/ID/Synonym | |synonyms={{Treatment/ID/Synonym | ||
|name=Azaleastrum albiflorum | |name=Azaleastrum albiflorum | ||
|authority=(Hooker) Rydberg | |authority=(Hooker) Rydberg | ||
| + | |rank=species | ||
}} {{Treatment/ID/Synonym | }} {{Treatment/ID/Synonym | ||
|name=Rhododendron albiflorum var. warrenii | |name=Rhododendron albiflorum var. warrenii | ||
|authority=(A. Nelson) M. A. Lane | |authority=(A. Nelson) M. A. Lane | ||
| + | |rank=variety | ||
}} | }} | ||
|hierarchy=Ericaceae;Ericaceae subfam. Ericoideae;Rhododendron;Rhododendron albiflorum | |hierarchy=Ericaceae;Ericaceae subfam. Ericoideae;Rhododendron;Rhododendron albiflorum | ||
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name=Rhododendron albiflorum | name=Rhododendron albiflorum | ||
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|authority=Hooker | |authority=Hooker | ||
|rank=species | |rank=species | ||
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|publication title=Fl. Bor.-Amer. | |publication title=Fl. Bor.-Amer. | ||
|publication year= | |publication year= | ||
| − | |special status= | + | |special status=Endemic |
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V8/V8_907.xml |
|subfamily=Ericaceae subfam. Ericoideae | |subfamily=Ericaceae subfam. Ericoideae | ||
|genus=Rhododendron | |genus=Rhododendron | ||
Latest revision as of 23:47, 5 November 2020
Shrubs, to 2.5 m, rhizomatous. Stems: bark ± smooth to furrowed; twigs multicellular eglandular-hairy (hairs unbranched) and unicellular-hairy. Leaves deciduous; petiole multicellular eglandular- and stipitate-glandular-hairy and unicellular-hairy; blade narrowly elliptic or ovate to obovate, 2–9 × 0.8–3 cm, thin, membranous to chartaceous, margins minutely serrate, plane, ciliate when young, eglandular- and stipitate-glandular-hairy, apex acute to ± rounded, surfaces scattered eglandular-hairy, ± glabrescent. Floral bud scales stipitate-glandular- and eglandular-hairy abaxially, margins stipitate-glandular-hairy. Inflorescences lateral (axillary, i.e., above leaf scars, spaced along shoots of previous year), fasciculate, 1–2-flowered; bracts similar to bud scales. Pedicels to 9–15 mm, eglandular- and stipitate-glandular-hairy. Flowers ± radially symmetric, opening soon after (and borne below) expanded leaves, pendulous, very fragrant (similar to vanilla and jasmine); calyx lobes 5–17 mm, eglandular- and stipitate-glandular-hairy, margins glandular-hairy; corolla white, rarely marked with yellow, bowl-shaped, 9–22 mm, minutely unicellular-hairy or glabrous on outer surface, petals connate, lobes 6–15 mm, tube expanding into lobes, 3–9 mm; stamens 9(–12), included, ± unequal, 5.5–14 mm. Capsules borne on erect pedicels, 6–8 × 5–6 mm, stipitate-glandular-, eglandular-, and unicellular-hairy. Seeds with distinct tails; testa closely appressed. 2n = 26.
Phenology: Flowering late spring–summer.
Habitat: Coniferous forests, alpine thickets, stream banks, seeps on rock outcrops
Elevation: 800-3500 m
Distribution
Alta., B.C., Colo., Idaho, Mont., Oreg., Wash.
Discussion
Rhododendron albiflorum is especially distinctive due to its axillary, white, somewhat pendulous, and nearly actinomorphic flowers, and it is placed in the monotypic subg. Candidastrum (Sleumer) Philipson & Philipson (W. R. Philipson and M. N. Philipson 1986). It is occasionally used as an ornamental. The disjunct population in Colorado has somewhat smaller calyx lobes and corollas and shorter stamens; it is sometimes recognized as var. warrenii (M. A. Lane et al. 1993). This variety is not recognized here because of the extent of morphological overlap between that population and those of the Pacific Northwest.
Selected References
None.