Alnus hirsuta

• Interesting Facts
• Common Names
• Description
• Biology
• Taxonomy
• Similar Species
• More Info
• Further Reading
• Notes

Interesting Facts

Common Names

Description

Family Betulaceae

Trees or shrubs deciduous, monoecious. Stipules present, free , often deciduous, rarely persistent . Leaves alternate, simple , petiolate , usually doubly serrate, rarely simply serrate, lobulate , or entire; veins pinnate. Flowers unisexual . Male inflorescence precocious , elongate , pendulous, with numerous overlapping bracts; each bract usually subtending a small dichasium with 1-3 male flowers; stamens as many as and opposite sepals or, if sepals obsolete , then stamens of inflorescence to 20; filaments very short, connate or nearly so; anthers 2-loculed, thecae connate or separate, opening by longitudinal slits. Female inflorescence pendulous or erect , with numerous overlapping bracts; each bract subtending a small dichasium with 2 or 3 flowers; calyx with 1-6 scalelike lobes , or obsolete; petals absent; ovary inferior, 2-loculed; styles 2, free; ovules 2, or 1 by abortion , pendulous from near apex of each locule. Fruit a nut or nutlet , winged or not. Seed 1, with straight embryo and flat or thickened cotyledons, without endosperm.

Six genera and 150-200 species: mainly in Asia, Europe, and North and South America; six genera (one endemic) and 89 species (56 endemic) in China.

Because of evolutionary divergence within the Betulaceae, the family has often been divided into tribes (i.e. , Betuleae, Carpineae, and Coryleae) or more recently into subfamilies (J. J. Furlow, J. Arnold Arbor . 71: 1-67. 1990) .[1]

Genus Alnus

Trees or shrubs , to 35 m ; trunks usually several, branching excurrent to deliquescent. Bark of trunks and branches light gray to dark brown, thin, smooth , close; lenticels often present, pale , prominent , sometimes horizontally expanded. Wood nearly white, turning reddish upon exposure to air , moderately light and soft, texture fine. Branches, branchlets , and twigs nearly 2-ranked to diffuse ; young twigs uniform or ( Alnus subg. Alnobetula ) differentiated into long and short shoots . Winter buds stipitate (nearly sessile in Alnus subg. Alnobetula ), narrowly to broadly ovoid or ellipsoid , terete , apex acute to rounded ; scales 2--3, valvate , or ( Alnus subg. Alnobetula ) several, imbricate, smooth, or ( Alnus subg. Clethropsis ) sometimes none. Leaves borne on long or short shoots, 3-ranked to nearly 2-ranked. Leaf blade ovate to elliptic or obovate , thin to leathery, base variable, cuneate to rounded, margins doubly serrate, serrate, serrulate , or nearly entire, apex variable, acute to obtuse or acuminate to rounded; surfaces glabrous to tomentose , abaxially sometimes resinous-glandular. Inflorescences: staminate catkins lateral , in racemose clusters or ( Alnus subg. Clethropsis ) solitary, formed ( Alnus subg. Alnus and Clethropsis ) during previous growing season and exposed or enclosed in buds during winter, or ( Alnus subg. Clethropsis ) formed and expanding during same growing season, expanding before or with leaves; pistillate catkins proximal to staminate catkins, solitary or in relatively small racemose clusters, erect to nearly pendulous, ovoid to ellipsoid, firm; scales and flowers crowded, developing and maturing at same time as staminate catkins. Staminate flowers in catkins, 3 per scale; stamens (3--) 4(--6) ; anthers and filaments undivided. Pistillate flowers usually 2 per scale. Infructescences erect or pendulous; scales persistent long after release of fruits, with 5 lobes , greatly thickened, woody. Fruits tiny samaras, lateral wings 2, leathery or membranaceous , reduced or essentially absent in some species. x = 7.

Species ca. 25 (8 sp: forested temperate and boreal Northern Hemisphere; North America; Asia.

Alders resemble birches but are easily distinguished from them by the infructescences, which consist of persistent , 5-lobed, woody scales (versus deciduous, 3-lobed, thin scales). Except in members of Alnus subg. Alnobetula Petermann (which have nearly sessile buds with several imbricate scales), alders are also distinctive in their stipitate buds bearing two stipular scales. The fruits, borne two to a scale, are laterally winged , although the wings are sometimes reduced or absent.

The genus is diverse , including several very distinct lines of specialization. The shrubby or arborescent Alnus subg. Alnus is characterized by winter buds with long stalks and two valvate scales, inflorescences borne in racemose clusters, and development of both pistillate and staminate inflorescences during the growing season prior to anthesis , with these fully exposed during winter. It includes the common A. rubra, A. incana, A. oblongifolia, and A. serrulata. Alnus subg. Alnobetula (represented in North America by three subspecies of A. viridis ) consists of shrubby species of cold-climate regions. In this group, the buds are nearly sessile and covered by several imbricate scales. Both staminate and pistillate catkins are formed the season before anthesis, but only the staminate ones are exposed during winter. The predominantly Asian Alnus subg. Clethropsis (Spach) Regel is represented in America by a single species, A. maritima, a small tree or large shrub of stream banks, marshes, and the shores of shallow lakes . Members of this group are unique in that they bloom in autumn rather than spring . They also differ from other native species in Alnus in having essentially naked buds, leaves with semicraspedodromous venation (i.e. , with the secondary veins branching and anastomosing with each other near the margin before reaching the teeth), and solitary pistillate inflorescences borne in the axils of foliage leaves. All of the alders associate symbiotically with species of the actinomycete Frankia, leading to the formation of nodules on the roots of the plants and the fixation of atmospheric nitrogen.[2]

Physical Description

Biology

Growth

Sunlight: Sun Exposure: Full Sun .

Temperature: Cold Hardiness: 6a, 6b, 7a. (map)

Taxonomy

Synonyms

Alnus hirsuta var. microphylla Tatew. • Alnus hirsuta var. sibirica (Spach) C. K. Schneid. • Alnus incana hirsuta< /i> (Spach) Á. Löve & D. Löve • Alnus incana var. hirsuta Spach • Alnus incana var. sibirica Spach • Alnus incana var. tinctoria (Sarg.) H. Winkl. • Alnus inokumai Murai & Kusaka • Alnus sibirica (Spach) Turcz. Ex Kom. • Alnus sibirica var. hirsuta (Spach) Koidz. • Alnus sibirica var. oxyloba C. K. Schneid. • Alnus sibirica var. paucinervis C. K. Schneid. • Alnus tinctoria Sarg.

Notes

Publishing author : Turcz. Publication : Bull . Soc. Imp. Naturalistes Moscou (1838) 101; xxvii. (1854) I. 406

Name Status: Accepted Name .

Last scrutiny: 11-Nov-2003

Similar Species

Members of the genus Alnus

ZipcodeZoo has pages for 28 species, subspecies, varieties, forms, and cultivars in this genus:

A. acuminata (Alder) · A. acuminata glabrata (Mexican Alder) · A. cordata (Italian Alder) · A. fallacina (Alder) · A. glutinosa (Black Alder) · A. glutinosa glutinosa (European Black Alder) · A. glutinosa 'Imperialis' (Black Alder) · A. glutinosa 'Pyramidalis' (Black Alder) · A. hirsuta (Manchurian Alder) · A. incana (Gray Alder) · A. incana incana (Speckled Alder) · A. incana rugosa (Gray Alder) · A. incana tenuifolia (Gray Alder) · A. japonica (Japanese Alder) · A. maritima (Seaside Alder) · A. nepalensis (Indian Alder) · A. nitida (West Himalayan Alder) · A. oblongifolia (Arizona Alder) · A. rhombifolia (Alder) · A. rubra (Oregon Alder) · A. rubra f. pinnatisecta (Oregon Alder) · A. serrulata (Alder) · A. viridis (Green Alder) · A. viridis crispa (Green Alder) · A. viridis fruticosa (Green Alder) · A. viridis sinuata (Green Alder) · A. viridis viridis (European Green Alder) · A. x fallacina (Alder)

More Info

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Further Reading

• Botaniska notiser. Upsala: Wahlstro?m, 1857-c1980. url p. 164.
• Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR) Translated from Russian. Jerusalem[Published for the National Science Foundation, Washington, D.C. by the Israel Program for Scientific Translations, 19 - url p. 342, p. 343, p. 90.
• Flora of Japan: in English: combined, much revised and extended translation / by the author of his Flora of Japan (1953) and Flora of Japan, Pteridophyta (1957); edited by Frederick G. Meyer and Egbert H. Walker. Washington: Smithsonian Institution, 1965. url p. 3, p. 374, p. 375, p. 5.
• Flora of the U.S.S.R. [Springfield, Va.: Israel Program for Scientific Translations; 1968- url p. 247.
• Forestry quarterly. Ithaca, N.Y. [etc.] url p. 476.
• Great Basin naturalist memoirs. 1992 [Provo, Utah]Brigham Young University, 1976-1992. url p. 1247.
• Horticulture. Boston, Mass.: Horticulture Pub. Co., c1904- url p. 647.
• Lepidopterous fauna of the USSR and adjacent countries: a collection of papers dedicated to professor Alexsandr Sergeevich Danilevskii / collected by O.L. Kryzhanovskii; Donald R. Davis, scientific editor; [translated from the Russian by P.M. Rao]. Washington, D.C.: National Science Foundation, 1988. url p. 101, p. 104, p. 110, p. 111, p. 112, p. 113, p. 114, p. 115, p. 117, p. 127, p. 129, p. 130, p. 147, p. 211, p. 97, p. 98, p. 99.
• New illustrated encyclopedia of gardening, unabridged. Edited by T.H. Everett, with contributions from twenty horticulturists and authorities in the United States and Canada. New York, Greystone Press[1964-] url p. 81.
• Pamphlets on forestry in Japan. [1900?- url p. 42, p. 51.
• Plantae Wilsonianae; an enumeration of the woody plants collected in western China for the Arnold arboretum of Harvard university during the years 1907, 1908, and 1910, by E. H. Wilson, ed. by Charles Sprague Sargent. Cambridge, University Press, 1913-17. url p. 490, p. 496, p. 497, p. 498, p. 515, p. 517, p. 544, p. 557, p. 558, p. 559, p. 560, p. 582, p. 628, p. 629.
• Proceedings of the Entomological Society of Washington. Washington, etc.: Entomological Society of Washington url p. 247.
• Proceedings of the United States National Museum. Washington: Smithsonian Institution Press, [etc.] url p. 2.
• Sargent, C. S. Plantae Wilsonianae: an enumeration of the woody plants collected in western China for the Arnold arboretum of Harvard university during the years 1907, 1908, and 1910 /by E. H. Wilson, ed. by Charles Sprague Sargent. 2 1916 Cambridge: The University press, 1913-17. url p. 496, p. 497, p. 498, p. 499, p. 500, p. 515, p. 517, p. 544, p. 558, p. 559, p. 560, p. 582, p. 628, p. 629.
• Standardized plant names; a catalogue of approved scientific and common names of plants in American commerce. Salem, Mass., 1923. url p. 9.
• The American florist: a weekly journal for the trade. Chicago: American Florist Company, [1885-1931] url p. 608.
• The Nautilus. Melbourne, Fla., etc., American Malacologists, inc., etc. url p. 64.
• The University of Kansas science bulletin. 33 1949 [Lawrence]: University of Kansas, 1902-1996. url p. 79, p. 82, p. 91.
• The conifers and taxads of Japan. Issued December 30, 1916. CambridgeUniversity Press1916 url p. 42, p. 51.
• The first fifty years of the Arnold Arboretum [by] C.S. Sargent. Cambridge, Mass., 1922 url p. 144.
• The standard cyclopedia of horticulture; a discussion, for the amateur, and the professional and commercial grower, of the kinds, characteristics and methods of cultivation of the species of plants grown in the regions of the United States a by L. H. Bailey; illustrated with colored plates, four thousand engravings in the text, and ninety-six full-page cuts. . New York, The Macmillan Co.; [etc., etc.]1916-1917 [v.5 1916] url p. 253.
• The trees of Great Britain & Ireland, Edinburgh, Priv. Print., 1906-13. url .
• Torreya. Burlington, Vt., Torrey Botanical Club, 1901-1945. url p. 189.
• Transactions of the Sapporo Natural History Society. Sapporo, Japan, Sapporo Natural History Society, Hokkaido Imperial University. url p. 149.
• Li Pei-chun & Cheng Sze-hsu. 1979. Betulaceae. In: Kuang Ko-zen & Li Pei-chun, eds., Fl. Reipubl. Popularis Sin. 21: 44-137.
• Furlow, J. J. 1979. The systematics of the American species of Alnus (Betulaceae). Rhodora 81: 1--121, 151--248.
• Hylander, N. 1957. On cut-leaved and small-leaved forms of Alnus glutinosa and A. incana. Svensk Bot. Tidskr. 51: 437--453.
• Murai, S. 1964. Phytotaxonomical and geobotanical studies on gen. Alnus in Japan (III). Taxonomy of whole world species and distribution of each sect. Bull. Gov. Forest Exp. Sta. 171: 1--107.
• Trappe, J. M., J. F. Franklin, R. F. Tarrant, and G. M. Hansen, eds. 1968. Biology of Alder.... Portland.

Notes

Contributors

• Bisby, F.A., Y.R. Roskov, M.A. Ruggiero, T.M. Orrell, L.E. Paglinawan, P.W. Brewer, N. Bailly, J. van Hertum, eds (2007). Species 2000 & ITIS Catalogue of Life: 2007 Annual Checklist. Species 2000: Reading, U.K.
• Brands, S.J. (comp.) 1989-2007. Systema Naturae 2000. The Taxonomicon. Universal Taxonomic Services, Amsterdam, The Netherlands. Accessed March 28, 2007.
• Brands, S.J. (comp.) 1989-present. The Taxonomicon. Universal Taxonomic Services, Zwaag, The Netherlands. Accessed January 10, 2012.
• Global Biodiversity Information Facility. Accessed February 29, 2008. http://www.gbif.org Mediated distribution data from 8 providers.
• Ruggiero M., Gordon D., Bailly N., Kirk P., Nicolson D. (2011). The Catalogue of Life Taxonomic Classification, Edition 2, Part A. In: Species 2000 & ITIS Catalogue of Life: 2011 Annual Checklist (Bisby F.A., Roskov Y.R., Orrell T.M., Nicolson D., Paglinawan L.E., Bailly N., Kirk P.M., Bourgoin T., Baillargeon G., Ouvrard D., eds). DVD; Species 2000: Reading, UK.
• The International Plant Names Index. Accessed Dec 27, 2011.
• World Checklist of Selected Plant Families. Release date: November 27, 2009

Data Sources

Accessed through GBIF Data Portal February 29, 2008:

• Burke Museum: Vascular Plant Collection - University of Washington Herbarium (WTU)
• Finnish Museum of Natural History: Botanic Garden of the Finnish Museum of Natural History
• Forest Research Institute, Department of Natural Forests: Herbarium
• Marine Science Institute, UCSB: Paleobiology Database
• Missouri Botanical Garden
• National Institute of Genetics, ROIS: Herbarium Specimens of Museum of Nature and Human Activities, Hyogo Pref., Japan
• National Science Museum of Korea: National Science Museum of Korea Plant
• US National Plant Germplasm System: United States National Plant Germplasm System Collection

Identifiers

• Biodiversity Heritage Library NamebankID: 5821799
• Catalogue of Life Accepted Name Code: Kew-6410
• Globally Unique Identifier: urn:lsid:ipni.org:names:294926-1
• International Plant Names Index (IPNI) ID: 294926-1
• Zipcode Zoo Species Identifier: 716923

Footnotes

1. Pei-chun Li & Alexei K. Skvortsov "Betulaceae". in Flora of China Vol. 4 Page 286. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org. [back]
2. "Alnus". in Flora of North America Vol. 3. Oxford University Press. Online at EFloras.org. [back]

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