Hornbeam

The common English name hornbeam derives from the hardness of the woods (likened to horn) and the Old English beam "tree" (cognate with Dutch ‘’Boom’’ and German Baum). The American hornbeam is also occasionally known as blue-beech, ironwood, or musclewood, the first from the resemblance of the bark to that of the American beech Fagus grandifolia, the other two from the hardness of the wood and the muscled appearance of the trunk and limbs. The botanic name for the genus, Carpinus, is the original Latin name for the European species.

Though some botanists grouped them with the hazels (Corylus) and hop-hornbeams (Ostrya) in a segregated family, Corylaceae, modern botanists place the hornbeams in the birch subfamily Coryloideae.

European hornbeam in Germany, during May

Hornbeams are small to medium-sized trees, Carpinus betulus reaching a height of 32 m.[2]^:296 The leaves are deciduous, alternate, and simple with a serrated margin, and typically vary from 3–10 cm in length. The flowers are wind-pollinated pendulous catkins, produced in spring. The male and female flowers are on separate catkins, but on the same tree (monoecious). The fruit is a small nut about 3–6 mm long, held in a leafy bract; the bract may be either trilobed or simple oval, and is slightly asymmetrical. The asymmetry of the seedwing makes it spin as it falls, improving wind dispersal. The shape of the wing is important in the identification of different hornbeam species. Typically, 10–30 seeds are on each seed catkin.

The 30–40 species occur across much of the temperate regions of the northern hemisphere, with the greatest number of species in east Asia, particularly China. Only two species occur in Europe, only one in eastern North America, and one in Mesoamerica.[1][3][4][5][6] Carpinus betulus can be found in Europe, Turkey and Ukraine.[7]

Hornbeams are used as food plants by the larvae of some Lepidoptera species, including autumnal moth, common emerald, feathered thorn, walnut sphinx, Svensson's copper underwing, and winter moth (recorded on European hornbeam) as well as the Coleophora case-bearers C. currucipennella and C. ostryae.[8]

Hornbeam trunk

Hornbeams yield a very hard timber, giving rise to the name "ironwood".[9] Dried heartwood billets are nearly white and are suitable for decorative use. For general carpentry, hornbeam is rarely used, partly due to the difficulty of working it. The wood is used to construct carving boards, tool handles, handplane soles, coach wheels, piano actions, shoe lasts, and other products where a very tough, hard wood is required. The wood can also be used as gear pegs in simple machines, including traditional windmills.[9] It is sometimes coppiced to provide hardwood poles. It is also used in parquet flooring and for making chess pieces.

Accepted species:[1]

1. Carpinus betulus L. – European hornbeam - widespread across much of Europe; Turkey, Iran, Caucasus; naturalized in a few places in US.[7]
2. Carpinus caroliniana Walter – American hornbeam - Quebec, Ontario, eastern half of US
3. Carpinus chuniana Hu – Guangdong, Guizhou, Hubei
4. Carpinus cordata Blume – Sawa hornbeam - Primorye, China, Korea, Japan
5. Carpinus dayongiana K.W.Liu & Q.Z.Lin – Hunan
6. Carpinus eximia Nakai – Korea
7. Carpinus faginea Lindl. – Nepal, Himalayas of northern India
8. Carpinus fangiana Hu[10] – Sichuan, Guangxi
9. Carpinus hebestroma Yamam. – Taiwan
10. Carpinus henryana (H.J.P.Winkl.) H.J.P.Winkl. – southern China
11. Carpinus japonica Blume – Japanese hornbeam - Japan
12. Carpinus kawakamii Hayata – Taiwan, southeastern China
13. Carpinus kweichowensis Hu – Guizhou, Yunnan
14. Carpinus langaoensis Z. Qiang Lu & J. Quan Liu – Shaanxi, China
15. Carpinus laxiflora (Siebold & Zucc.) Blume – Aka-shide hornbeam - Japan, Korea
16. Carpinus lipoensis Y.K.Li – Guizhou
17. Carpinus londoniana H.J.P.Winkl. – southern China, northern Indochina
18. Carpinus luochengensis J.Y.Liang – Guangxi
19. Carpinus mengshanensis S.B.Liang & F.Z.Zhao – Shandong
20. Carpinus microphylla Z.C.Chen ex Y.S.Wang & J.P.Huang – Guangxi
21. Carpinus mollicoma Hu – Tibet, Sichuan, Yunnan
22. Carpinus monbeigiana Hand.-Mazz. – Tibet, Yunnan
23. Carpinus omeiensis Hu & W.P.Fang – Sichuan, Guizhou
24. Carpinus orientalis Mill. – Oriental hornbeam - Hungary, Balkans, Italy, Crimea, Turkey, Iran, Caucasus
25. Carpinus paohsingensis W.Y.Hsia – China
26. Carpinus polyneura Franch. – southern China
27. Carpinus pubescens Burkill – China, Vietnam
28. Carpinus purpurinervis Hu – Guizhou, Guangxi
29. Carpinus putoensis W.C.Cheng – Putuo hornbeam - Zhejiang
30. Carpinus rankanensis Hayata – Taiwan
31. Carpinus rupestris A.Camus – Yunnan, Guangxi, Guizhou
32. Carpinus shensiensis Hu – Gansu, Shaanxi
33. Carpinus shimenensis C.J.Qi – Hunan
34. †Carpinus tengshongensis W.C.Cheng[11] – Zhejiang but probably extinct
35. Carpinus tropicalis (Donn.Sm.) Lundell – Mexico, Central America
36. Carpinus tsaiana Hu – Yunnan, Guizhou
37. Carpinus tschonoskii Maxim. – Chonowski's hornbeam - China, Korea, Japan
38. Carpinus turczaninowii Hance – Korean hornbeam,[12] - China, Korea, Japan
39. Carpinus viminea Wall. ex Lindl. – China, Korea, Himalayas, northern Indochina

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Look up hornbeam in Wiktionary, the free dictionary.

Wikisource has the text of the 1911 Encyclopædia Britannica article Hornbeam.

• Eichhorn, Markus (December 2011). "Hornbeam". Test Tube. Brady Haran for the University of Nottingham.