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Carpinus caroliniana

(American Hornbeam)

Interesting Facts

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Common Names

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Click on the language to view common names.

Common Names in English:

American Hornbeam, Blue Beech, Blue-Beech, Ironwood, Musclewood, Water Beech, Water-Beech

Common Names in French:

Bois De Fer, Charme De Caroline

Description

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Genus Carpinus

Trees , 8--25 m ; trunks usually 1, branching mostly deliquescent, trunk and branches irregularly longitudinally ridged , fluted . Bark of trunk and branches bluish to brownish gray, thin, smooth , close [thicker, broken or shredded ]; lenticels generally inconspicuous. Wood nearly white to light brown, very hard and heavy, texture fine. Branches, branchlets , and twigs conspicuously 2-ranked; young twigs differentiated into long and short shoots . Winter buds sessile, ovoid , 4-angled in cross section , apex acute; scales many, imbricate, smooth. Leaves on long and short shoots, 2-ranked. Leaf blade narrowly ovate to ovate, elliptic , or obovate with 10 or more pairs of lateral veins, 3--12 × 3--6 cm, thin, margins doubly serrate to serrulate ; surfaces abaxially glabrous to tomentose , sometimes covered with small glands . Inflorescences: staminate catkins solitary or in small racemose clusters , lateral, formed previous growing season and enclosed [exposed] in buds during winter, expanding with leaves; pistillate catkins distal to staminate on short, leafy new growth, solitary, ± erect , elongate ; bracts and flowers uncrowded. Staminate flowers in catkins 3 per scale, crowded together on pilose receptacle; stamens 3(--6), short; filaments often distinct part way to base ; anthers divided into 2 parts, each 1-locular, apex pilose, Pistillate flowers 2 per bract. Infructescences loose racemose clusters of paired bracts, clusters pendulous, elongate; paired bracts deciduous with fruit, expanded, (1--) 3-lobed, variously toothed , foliaceous , each bract subtending 1 fruit. Fruits small nutlets , deltoid, longitudinally ribbed , often crowned with persistent sepals and styles. x = 8.

Species ca. 25: mostly north temperate zone; Europe, Asia (s to India, Iran).

In the flora , Carpinus consists of a single native species , C. caroliniana, which is composed of two fairly distinctive geographic races (J. J. Furlow 1987, 1987b), treated here as subspecies . Worldwide it includes about 25 species, some of which become large trees. The European C. betulus is frequently planted in North America and persists long after other signs of human development have vanished. It seldom escapes , however, and it has not become naturalized . In the mountains of Mexico and Central America, the larger C. tropicalis (Donnell Smith) Lundell is widespread in the temperate forest zone.

Closely related to Ostrya, Carpinus is easily recognized by its smooth, gray, often fluted stems and racemose infructescences consisting of pairs of uncrowded, foliaceous, 3-lobed bracts, each subtending a small triangular nutlet . The staminate (but not the pistillate) catkins develop in the autumn and are enclosed within buds throughout the winter prior to anthesis (in Ostrya, these are exposed during the winter). The pistillate catkins are produced on the first new growth in the spring .

Of relatively minor economic importance, Carpinus has limited use for its very hard wood, especially in Europe, where it is used for making mallet heads , tool handles, levers, and other small, hard, wooden objects.[1]

Physical Description

Species Carpinus caroliniana

Trees , to 12 m ; trunks short, often crooked, longitudinally or transversely fluted , crowns spreading . Bark gray, smooth to somewhat roughened. Wood whitish, extremely hard, heavy. Winter buds containing inflorescences squarish in cross section , somewhat divergent, 3--4 mm. Leaf blade ovate to elliptic , 3--12 × 3--6 cm, margins doubly serrate, teeth typically obtuse and evenly arranged, primary teeth often not much longer than secondary; surfaces abaxially slightly to moderately pubescent , especially on major veins, with or without conspicuous dark glands . Inflorescences: staminate inflorescences 2--6 cm; pistillate inflorescences 1--2.5 cm. Infructescences 2.5--12 cm; bracts relatively uncrowded, 2--3.5 × 1.4--2.8 cm, lobes narrow, elongate , apex nearly acute, obtuse, or rounded , central lobe (1--) 2--3 cm. [source]

Carpinus caroliniana consists of two rather well-marked geographical races. These hybridize or intergrade in a band extending from Long Island along the Atlantic coast through coastal Virginia and North Carolina, and then westward in northern South Carolina, Georgia, Alabama, Mississippi, and Louisiana. Plants with intermediate features are also found throughout the highlands of Missouri and Arkansas. J. J. Furlow (1987b) has described the variation of this complex in detail. [source]

ID Features: Small, imbricate buds, 0.25" long. Buds are pointed and hairy. Alternate leaf arrangement. Clusters of nutlets with 3-winged bracts. Fluted, muscle-like bark. Dense, clean summer foliage.

Habit: A deciduous large shrub or small tree . Multistemmed, wide spreading , flat-topped crown. Older stems resemble a flexed muscle.

Flowers: Monoecious with male and female flowers on the same plant. Female flowers are 4" long and are attached to a 3-winged bract. Male flowers are not ornamentally important. Blooms in April. • Bloom Period: March, April, May. • Flower Color: green, near white, white

Seeds: Fruit: A nutlet subtended by a 3-winged, leaf-like bract. 1" long. Numerous nutlets are held together in pendulous chain-like clusters . Color changes from green to brown in September thru October.

Foliage: Summer foliage: Alternate leaf arrangement . Simple , deciduous leaves. 2.5" long and 5" wide. Oblong leaf shape . Doubly-serrated leaf margin . Dark green leaf color, glabrous . • Fall foliage: Yellow, orange, and red fall color. Variable.

Size/Age/Growth

Growth Rate: Slow. • Size: to 40 ft . high and wider with age.

Landscaping

Landscape Uses: Shade tree . Lawn tree. Park tree. Naturalized area. Hedge . Screen . Specimen. • Liabilities: Leaf diseases. Cankers . Doesn't transplant well. • Care: Follow a regular watering schedule during the first growing season to establish a deep, extensive root system . Watering can be reduced after establishment. Feed with a general purpose fertilizer before new growth begins in spring .

Habitat

Hardy to zone 3.

Typically found at an altitude of 0 to 2,401 meters (0 to 7,877 feet).[2]

Biology

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Reproduction

Duration: Perennial

Growth

Culture: Transplants from containers . Prefers, deep fertile , moist, acidic soil. Full sun to shade. Prune tolerant .

Soil: Well-drained fertile soils. • Minimum pH: 6.6 • Maximum pH: 8.5

Sunlight: Sun Exposure: Filtered sun

Moisture: Water Requirements: Water regularly, when top 3 in. of soil is dry.

Temperature: Heat Zones: High: 9 (>120 to 150 days) Low:1 (< 1 days) (map) • Cold Hardiness: 2a, 2b, 3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b. (map)

Taxonomy

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Notes

A tentatively accepted name in the RHS Horticultural Database.

Name Status: Accepted Name. Latest taxonomic scrutiny: Govaerts R., 11-Nov-2003.

Place of publication : Fl. carol. 236. 1788

Name verified on 10-Aug-1998 by ARS Systematic Botanists. Last updated: 10-Aug-1998

Similar Species

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Members of the genus Carpinus

ZipcodeZoo has pages for 140 species, subspecies, varieties, forms, and cultivars in this genus. Here are just 100 of them:

C. americana · C. attenuata · C. austro-sinensis · C. austro-yunnanensis · C. austrosinensis · C. betula 'Globosa' · C. betulus (European Hornbeam) · C. betulus 'A. Beeckman' · C. betulus 'Albovariegata' · C. betulus 'Asplenifolia' (European Hornbeam) · C. betulus 'Columnaris' · C. betulus 'Columnaris Nana' · C. betulus 'Cucullata' · C. betulus 'Fastigiata' (Fastigate European Hornbeam) · C. betulus 'Frans Fontaine' · C. betulus 'Gerry Chaster' · C. betulus 'Globosa' (European Hornbeam) · C. betulus 'Heterophylla' · C. betulus 'Horizontalis' · C. betulus 'Incisa' (European Hornbeam) · C. betulus 'Pendula' (Weeping European Hornbeam) · C. betulus 'Punctata' · C. betulus 'Purpurea' · C. betulus 'Pyramidalis' · C. betulus 'Quercifolia' (European Hornbeam) · C. betulus var. angustifolia · C. betulus var. carpinizza · C. betulus var. parva · C. betulus 'Variegata' · C. betulus 'Vienna Weeping' (Hornbeam) · C. caroliniana (American Hornbeam) · C. caroliniana 'Ascendens' · C. caroliniana caroliniana (American Hornbeam) · C. caroliniana var. Crimson Cloud (Crimson Cloud English Hawthorn) · C. caroliniana 'Palisade' · C. caroliniana 'Pyramidalis' · C. caroliniana subsp. virginiana · C. caroliniana tropicalis · C. caroliniana Walter var. virgiana Marshall · C. caroliniana virginiana (American Hornbeam) · C. chuniana · C. cordata (Heartleaf Hornbeam) · C. cordata Blume var. chinensis Franch. · C. cordata var. chinensis · C. cordata var. cordata · C. cordata var. mollis · C. coreana · C. coreana var. major · C. davidiana · C. dayongiana · C. dayongina · C. dulongensis · C. edentulus · C. erosa · C. eximia · C. fagiana · C. faginea · C. fangiana (Fang Hornbeam) · C. fargesiana · C. fargesiana var. fargesiana · C. fargesiana var. hwai · C. fargesii · C. fraterna · C. glutinosa 'Laciniata' · C. grandis · C. hebestroma · C. heigunensis · C. henryana · C. henryana var. henryana · C. henryana var. oblongifolia · C. henryana var. simplicidentata · C. japonica (Japanese Hornbeam) · C. kawakamii · C. kawakamii var. kawakamii · C. kawakamii var. minutiserrata · C. koreana · C. kweichowensis · C. lacera · C. laxiflora (Loose-Flower Hornbeam) · C. laxiflora var. longispica · C. lipoensis · C. londoniana · C. londoniana var. lanceolata · C. londoniana var. latifolius · C. londoniana var. londoniana · C. londoniana var. xiphobracteata · C. luochengensis · C. mediomontana · C. mengshanensis · C. mianningensis · C. microphylla · C. miocenica · C. mollicoma · C. mollis · C. monbeigiana · C. nipponica · C. omeiensis · C. orientalis (Eastern Hornbeam) · C. orientalis 'Calcarea' · C. orientalis 'Grandifolia'

More Info

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Further Reading

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Notes

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Contributors

Data Sources

Accessed through GBIF Data Portal November 18, 2007:

Identifiers

Footnotes

  1. "Carpinus". in Flora of North America Vol. 3. Oxford University Press. Online at EFloras.org. [back]
  2. Mean = 216.890 meters (711.581 feet), Standard Deviation = 317.020 based on 1,141 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]
Last Revised: 7/1/2009