| 词条 | Clethra alnifolia |
| 释义 |
|image = Clethra-alnifolia-flowers.JPG |genus = Clethra |species = alnifolia |authority = L. |synonyms =
|synonyms_ref = [1] }} Clethra alnifolia, the coastal sweetpepperbush or summersweet, is a species of flowering plant in the genus Clethra of the family Clethraceae, native to eastern North America from southern Nova Scotia and Maine south to northern Florida, and west to eastern Texas. It is a deciduous shrub growing to {{convert|1.5|-|3|m|0|abbr=on}} tall. The leaves are obovate to oblong, 4–10 cm long and 2–4 cm broad, with a serrated margin; they are green turning yellow-golden during the autumn. The flowers are white or very pale pink, 5–10 mm in diameter, and have a sweet, somewhat cloying fragrance, the flowers attractive to bumblebees; they are produced in racemes up to 15 cm long and 2 cm broad in late summer, depending on the cultivar. The "pepper" part of the common name derives from the mature fruits, capsules which have a vague resemblance to peppercorns, however, with no element of spiciness. It grows in wet forests, pine flatwoods, wetlands, bogs and can be seen alongside woodland streams. It prefers a neutral to acidic soil. The Nova Scotia population is small and endangered. EtymologyThe Latin specific epithet alnifolia means "with leaves like alder (Alnus)".[2] This gave rise to another common name, common white alder,[3] though the two plants are not closely related. CultivationC. alnifolia is typically used as a shrub for natural gardens, or is placed alongside a stream or pond to delay erosion. It does not leaf out until very late in the season, limiting its landscaping use. Several cultivars have been selected for garden use, including 'September Beauty'. Both 'Ruby Spice',[3] with strongly pink flowers, and the dwarf 'Hummingbird'[4] have gained the Royal Horticultural Society's Award of Garden Merit (confirmed 2017).[5]References{{Commons category}}1. ^{{cite web|url=http://www.theplantlist.org/tpl1.1/record/kew-43188|title=The Plant List: A Working List of All Plant Species|accessdate=19 September 2015}} 2. ^{{cite book |last=Harrison |first=Lorraine |title=RHS Latin for Gardeners |year=2012 |publisher=Mitchell Beazley |location=United Kingdom |isbn=184533731X }} 3. ^1 {{cite web | url = https://www.rhs.org.uk/Plants/115560/i-Clethra-alnifolia-i-Ruby-Spice/Details| title = RHS Plantfinder - Clethra alnifolia 'Ruby Spice'| accessdate = 30 January 2018}} 4. ^{{cite web | url = https://www.rhs.org.uk/Plants/115559/i-Clethra-alnifolia-i-Hummingbird/Details| title = RHS Plantfinder - Clethra alnifolia 'Hummingbird'| accessdate = 30 January 2018}} 5. ^{{cite web | url= https://www.rhs.org.uk/plants/pdfs/agm-lists/agm-ornamentals.pdf | title = AGM Plants - Ornamental | date = July 2017 | page = 16 | publisher = Royal Horticultural Society | accessdate = 24 January 2018}} External links
4 : Clethra|Flora of Canada|Flora of the Eastern United States|Plants described in 1753 |
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