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ERICACEAE HEATH FAMILY

Gary D. Wallace, except as noted

Perennial herb, shrub, tree. Stem: bark often peeling distinctively. Leaf: simple or 0, generally cauline, alternate, opposite (whorled), evergreen or deciduous, often leathery, petioled or not; stipules 0. Inflorescence: raceme, panicle, cyme, or flowers 1, terminal or axillary, generally bracted; pedicel often with 2 bractlets. Flower: generally bisexual, generally radial, bell-shaped, cylindric, or urn-shaped; sepals generally (0)4–5, generally free; petals generally (0)4–5, free or fused; stamens (2–5)8–10, free, filaments rarely appendaged, anthers dehiscing by pores or slits, awns 0 or 2(4), seemingly abaxial, reduced or elongate, generally curved; nectary generally present at ovary base, generally disk-like; ovary superior or inferior, chambers generally 1–5, placentas axile or parietal, ovules 1–many per chamber, style 1, stigma head- to funnel-like or lobed. Fruit: capsule, drupe, berry. Seed: generally many, winged or not.
± 100 genera, 3000 species: generally worldwide except deserts; some cultivated, especially Arbutus, Arctostaphylos, Rhododendron, Vaccinium. [Kron et al. 2002 Bot Rev 68:335–423] Monophyletic only if Empetraceae included, as treated here. Ledum included in Rhododendron. Non-green plants obtain nutrition from green plants through fungal intermediates. —Scientific Editors: Gary D. Wallace, Thomas J. Rosatti.

Key to Ericaceae

RHODODENDRON

Kathleen A. Kron & Walter S. Judd

Shrub to tree, glabrous, hairy, and/or with glandular scale-like hairs. Stem: prostrate to erect, bark thin, sometimes peeling or shredding. Leaf: alternate, evergreen or deciduous, ovate to obovate to elliptic, margin entire, flat to rolled under. Inflorescence: raceme, 1–many-flowered, bracts green to red-brown. Flower: sepals, petals generally 5, corolla radial to bilateral, 1–5 cm, petals free to ± fused, spots or blotch present or 0; anther awns 0; ovary superior. Fruit: capsule, septicidal, dehiscing base to tip or tip to base, placentas axile. Seed: many, fusiform, ± flat to not, wings and/or tails present or 0.
± 1000 species: northern hemisphere, tropical Asia, to Australia. (Greek: rose tree)
Unabridged references: [Chamberlain 1982. Notes Roy. Bot. Gard. Edinburgh 39:209–486; Cullen 1980 Notes Roy. Bot. Gard. Edinburgh 39:1–207]

Key to Rhododendron

R. columbianum (Piper) Harmaja WESTERN LABRADOR TEA
NATIVE
Stem: erect, < 2 m, bark smooth, peeling or shredding in age or not, twigs with unicellular hairs, papillae, and/or ± flat glandular scales. Leaf: (1)2–8 cm, 1.5–3 cm wide, leathery, evergreen, margin flat or ± rolled under, abaxially with sparse to dense papillae, ± flat glandular scales, adaxially with scattered ± flat glandular scales and/or papillae. Inflorescence: ± rounded, bracts, bractlets with ± flat glandular scales, margins ciliate. Flower: corolla widely bell-shaped, white to cream; stamens (8)10, ± equal. Fruit: 8–10 mm wide, ± longer, dehiscing base to tip. Seed: ± fusiform, coat ± elongated beyond narrow end.
Coast, higher elevations inland, bogs, stream margins, occasionally well-drained sites; < 3630 m. North Coast, Klamath Ranges, s Outer North Coast Ranges, High Cascade Range, s Sierra Nevada Foothills, High Sierra Nevada, Central Coast, San Francisco Bay Area, n Inner South Coast Ranges, Warner Mountains, East of Sierra Nevada; to British Columbia, Montana, Wyoming, Utah. [Ledum glandulosum Nutt.] May–Aug [Online Interchange]

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Aug 1 2014
Citation for this treatment: [Author of taxon treatment] 2013. Rhododendron, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=91858, accessed on Aug 1 2014

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Bioregions in which Rhododendron columbianum occurs Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.