Overview
|
Near Threatened |
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Interesting Facts
Common Names
Common Names in English:
Beach Alder, Seaside Alder, Brook Alder
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
Species Alnus maritima
Shrubs
or trees
, to 10 m
; crowns narrow. Bark
light gray, smooth
;
lenticels
small, inconspicuous. Winter buds
stipitate
, ovoid
to ellipsoid
,
2.5--5 mm, apex rounded
; stalks
1--3 mm; scales
2--3, subequal
, often
poorly developed, heavily resin-coated. Leaf blade
narrowly elliptic
,
oblong
, or narrowly obovate
, 4.5--9 × 2--5 cm, leathery, base
acute to cuneate, margins
flat, teeth low, single, relatively distant
,
apex acute, obtuse
, or rounded; surfaces abaxially mostly glabrous
,
resin-coated when young. Inflorescences: catkins formed during same
season
as flowering; staminate
catkins in 1 terminal
cluster
of 2--4,
2--6 cm; pistillate
catkins solitary in leaf axils
proximal
to staminate
catkins. Flowering in late summer or early fall
. Infructescences
ovoid, 1.2--2.8 × 1.2--2.2 cm; peduncles 5--10 mm.
Samaras
elliptic, wings
reduced to narrow, leathery ridges
. 2 n = 28. [source]
Alnus maritima consists of widely disjunct
populations in Delaware,
Maryland, and southern Oklahoma. The populations probably represent
remnants of Pleistocene
and post-Pleistocene distributions and migrations.
It is our only member
of the predominantly Asian fall-blooming Alnus
subg. Clethropsis. [source]
Habit: Forb/herb
Flowers: Bloom Period: July, August. • Flower Color: purple, red
Size/Age/Growth
Size: 12-15' tall.
Habitat
Along edges of ponds and small streams , often in standing water ; 0--100 m [3].
Typically found at an altitude of 0 to 280 meters (0 to 919 feet).[4]
Ecology: A shrub or tree occurring at the edges of ponds , small streams or standing water .[5].
Biology
Reproduction
Duration: Perennial
Growth
Sunlight: Sun Exposure: Full Sun .
Temperature: Cold Hardiness: 3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a. (map)
Taxonomy
- Domain:
Eukaryota
(
)
- Whittaker & Margulis,1978
- eukaryotes
- Kingdom:
Plantae
(
)
- Haeckel, 1866
- Plants
- Subkingdom:
Viridaeplantae
(
)
- Cavalier-Smith, 1981
- Phylum:
Tracheophyta
(
)
- Sinnott, 1935 ex Cavalier-Smith, 1998
- Vascular Plants
- Subphylum:
Euphyllophytina
(
)
- Infraphylum:
Radiatopses
(
)
- Kenrick & Crane, 1997
- Class:
Spermatopsida
(
)
- Brongniart, 1843
- Subclass:
Rosidae
(
)
- Takhtajan, 1967
- Superorder:
Faganae
(
)
- (Engler, 1892) Takhtajan, 1997
- Order:
Fagales
(
)
- Engler, 1892
- Family:
Betulaceae
(
)
- Gray, 1821
- Birch Family
- Subfamily:
Betuloideae
(
)
- Subfamily:
Betuloideae
(
- Family:
Betulaceae
(
- Order:
Fagales
(
- Superorder:
Faganae
(
- Subclass:
Rosidae
(
- Class:
Spermatopsida
(
- Infraphylum:
Radiatopses
(
- Subphylum:
Euphyllophytina
(
- Phylum:
Tracheophyta
(
- Subkingdom:
Viridaeplantae
(
- Kingdom:
Plantae
(
Synonyms
Alnus maritima georgiensis J. A. Schrad. & W. R. Graves • Alnus maritima metoporina (Furlow) E. Murray • Alnus maritima oklahomensis J. A. Schrad. & W. R. Graves • Alnus maritima var. metoporina (Furlow) E. Murray • Alnus metoporina Furlow • Alnus oblongata Regel • Arbust. Amer. • Betula-alnus maritima Marshall
Notes
Basionym
: Betulaceae Betula-alnus maritima Marshall
Basionym author: (Marshall)
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)
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Further Reading
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- A list of the birds of Maryland, giving dates of the arrival, departure and nesting periods of our regular birds; also including stragglers and such others as no doubt occur but are not recorded. By F.C. Kirkwood. .. Baltimore[Deutsch Lithographing & Printing Co.]1895. url p. 321, p. 325.
- A list of the birds of Maryland: giving dates of the arrival, departure and nesting periods of our regular birds, also including stragglers and such others as no doubt occur but are not recorded / Baltimore: Deutsch Lithographing & Print. Co.; 1895. url , .
- A manual of the timbers of the world: their characteristics and uses: to which is appended an account by S. Fitzgerald of the artificial seasoning of timber. London: Macmillan, 1920. url , .
- A preliminary catalogue of the Bernice Pauahi Bishop museum of Polynesian ethnology and natural history. .. Honolulu, 1892-93. url p. 39.
- American forest trees, by Henry H. Gibson; ed. by Hu Maxwell. Chicago, Hardwood record, 1913. url , p. 11, p. 592, p. 592.
- American forest trees; edited by Hu Maxwell. ChicagoHardwood Record1913 url .
- American forests. Washington [etc.]American Forestry Association [etc.] url .
- An illustrated flora of the northern United States, Canada and the British possessions: from Newfoundland to the parallel of the southern boundary of Virginia and from the Atlantic Ocean westward to the 102nd meridian / by Nathaniel Lord Britton and Hon. Addison Brown. New York: Scribner, 1913. url p. 612, p. 614.
- Annual report of the Director of Forestry. Manila [etc.] url p. 50.
- Annual report of the Ohio State Academy of Science. Columbus: The Academy, 1893-1930. url p. 136.
- Annual report of the Secretary of the State Board of Agriculture of the State of Michigan. .. Lansing: The Board, 1862- url p. 125, p. 46.
- Aquatic and wetland plants of southwestern United States, by Donovan S. Correll and Helen B. Correll. [Washington]Environmental Protection Agency; [For sale by the Supt. of Docs., U.S. Govt. Print. Off.]1972. url p. 779, p. 781, p. 782.
- Bulletin / U.S. Department of Agriculture, Bureau of Plant Industry. Washington: G.P.O., 1901-1913. url p. 13.
- Bulletin of the Torrey Botanical Club. 18 1891 New York: Torrey Botanical Club, 1870-1996 url p. 277.
- Canadian trees worth knowing. Toronto, Musson[1917] url p. 283.
- Check list of the forest trees of the United States: their names and ranges / by George B. Sudworth. Washington, D.C.: Dept. of Agriculture, Forestry Division, 1898. url p. 114, p. 126, p. 49.
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- Winter botany, a companion volume to the author's Plant materials of decorative gardening, by William Trelease. .. Urbana, The author, 1918. url p. 25.
- Winter botany, by William Trelease. .. Urbana, The author, 1918. url p. 25.
- Wood, a manual of the natural history and industrial applications of the timbers of commerce. London, E. Arnold, 1902. url p. 213.
- 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
- "Alnus maritima". in Flora of North America Vol. 3. Published by Oxford University Press. Online at EFloras.org.
- Brands, S.J. (comp.) 1989-present. The Taxonomicon. Universal Taxonomic Services, Zwaag, The Netherlands. Accessed January 10, 2012.
- Global Biodiversity Information Facility. Accessed December 04, 2007. http://www.gbif.org Mediated distribution data from 4 providers.
- IUCN 2012. IUCN Red List of Threatened Species. Version 2011.2. . Downloaded on January 28, 2012.
- 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.
- USDA, ARS, National Genetic Resources Program. Germplasm Resources Information Network - (GRIN) [Online Database]. National Germplasm Resources Laboratory, Beltsville, Maryland. URL (April 25, 2008)
- World Checklist of Selected Plant Families. Release date: November 27, 2009
- World Conservation Monitoring Centre 1998. Alnus maritima. In: IUCN 2011. IUCN Red List of Threatened Species. Version 2011.2. <www.iucnredlist.org>. Downloadedon 30January2012.
Data Sources
Accessed through GBIF Data Portal December 04, 2007:
- Missouri Botanical Garden, Missouri Botanical Garden
- US National Plant Germplasm System, United States National Plant Germplasm System Collection
- USDA PLANTS, USDA PLANTS Database
Identifiers
- Biodiversity Heritage Library NamebankID: 2646006
- Catalogue of Life Accepted Name Code: Kew-6509
- Global Biodiversity Information Facility Taxonkey: 14238649
- Globally Unique Identifier: urn:lsid:ipni.org:names:294949-1
- GRIN Nomen Number: 2465
- Integrated Taxonomic Information System (ITIS) Taxonomic Serial Number (TSN): 19467
- International Plant Names Index (IPNI) ID: 9436-2
- IUCN ID: 189959
- Natural Heritage Network Species Identifier: PDBET01030
- U.S.D.A. Plant Symbol: BEMA
- Zipcode Zoo Species Identifier: 20578
Footnotes
- 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]
- "Alnus". in Flora of North America Vol. 3. Oxford University Press. Online at EFloras.org. [back]
- "Alnus maritima". in Flora of North America Vol. 3. Oxford University Press. Online at EFloras.org. [back]
- Mean = 129.000 meters (423.228 feet), Standard Deviation = 119.600 based on 8 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]
- World Conservation Monitoring Centre 1998. Alnus maritima. In: IUCN 2011. IUCN Red List of Threatened Species. Version 2011.2. <www.iucnredlist.org>. Downloaded on 30 January 2012. [back]
