Fontem paginae Alnus inspicere

{{Latinitas|-2}}
{{taxobox
|name = Alnus
|image = Tagalder8139.jpg
|image_caption = ''Alnus serrulata''<br/>[[Amentum (flos)Amenta]] maria ad dextram,<br />amenta feminea matura ad sinistram<br />[[Johnsonville (Carolina Meridionalis)|Johnsonville]]
|regnum = [[Plantae]]
|unranked_divisio = [[Angiospermae]]
|unranked_classis = [[Eudicotyledones]]
|unranked_ordo = [[Rosidae]]
|ordo = [[Fagales]]
|familia = [[Betulaceae]]
|genus = '''''Alnus'''''
|genus_authority = [[Philippus Miller|Mill.]]
|subdivision_ranks = Species
|subdivision = Inter 20 et 30 species
| range_map = Alnus distribution.svg
| range_map_caption
}}
[[Fasciculus:Alder trees by the Beaulieu River at Longwater Lawn.jpg|thumb|''Alni'' ad [[Beaulieu (fluvius)]] fluvium ad [[Longwater Lawn]].]]
'''''Alnus'''''  ([[nomen botanicum]] ab [[Philippus Miller|Philippo Miller]] statutum) est [[genus (taxinomia)|genus]] [[arbor]]um et [[frutex|fruticum]] [[familia (taxinomia)|familiae]] [[Betulaceae|Betulacearum]]. Species variae alnorum a 23 ad 40 numerantur.

==Descriptio==

Unica species est arborum cum [[folium|foliis]] deciduis (praeter [[larix|laricem]]), cuius [[flos|flores]] [[femina (sexus)|feminei]] ([[amentum (flos)|amenta]] vel et [[iulus|iuli]] dicti) [[lignum|lignificant]] et iure [[nux|nucamenta]] dici possunt. 

==Taxinomia==
Tria subgenera habet:
{{div col|2}}
'''Subgenus ''Alnus'''''
* ''[[Alnus acuminata]]'' <small>Kunth</small>
* ''[[Alnus cordata]]''  <small>(Loisel.) Duby</small>
* ''[[Alnus cremastogyne]]'' <small>Burkill</small> 
* ''[[Alnus firma]]'' <small>Siebold & Zucc.</small> 
* ''[[Alnus glutinosa]]''  <small>(L.) Gaertn.</small>
* ''[[Alnus incana]]''  <small>(L.) Moench</small> 
** ''[[Alnus incana|Alnus incana subsp. rugosa]]''  <small>(Du Roi) Spreng.</small> 
* ''[[Alnus hirsuta]]'' <small>(Spach) Rupr.</small>
* ''[[Alnus oblongifolia]]'' <small>Torr.</small> 
* ''[[Alnus tenuifolia]]'' <small>Nutt.</small> 
* ''[[Alnus japonica]]'' <small>(Thunb.) Steud.</small> 
* ''[[Alnus jorullensis]]'' <small>Kunth</small> 
* ''[[Alnus matsumurae]]'' <small>Callier</small> 
* ''[[Alnus nepalensis]]'' <small>D.Don</small> 
* ''[[Alnus orientalis]]'' <small>Decne.</small> 
* ''[[Alnus rhombifolia]]'' <small>Nutt.</small> 
* ''[[Alnus rubra]]'' <small>Bong.</small>
* ''[[Alnus serrulata]]''  <small>(Aiton) Willd.</small>
* ''[[Alnus subcordata]]''  <small>C.A.Mey.</small> 
* ''[[Alnus trabeculosa]]'' <small>Hand.-Mazz.</small> 

'''Subgenus ''Clethropsis'''''
* ''[[Alnus formosana]]'' <small>(Burkill) Makino</small> 
* ''[[Alnus maritima]]'' <small>(Marshall) Muhl. ex Nutt.</small> 
* ''[[Alnus nitida]]'' <small>(Spach) Endl.</small>

'''Subgenus ''Alnobetula'''''
* ''[[Alnus alnobetula]]'' <small>(Ehrh.) K.Koch</small>
* ''[[Alnus firma]]'' <small>Siebold & Zucc.</small> 
* ''[[Alnus mandshurica]]'' <small>(Callier) Hand.-Mazz.</small> 
* ''[[Alnus maximowiczii]]'' <small>Callier</small> 
* ''[[Alnus pendula]]'' <small> Matsum.</small> 
* ''[[Alnus sieboldiana]]'' <small> Matsum.</small> 

'''Aliae species'''
* ''[[Alnus djavanshirii]]'' <small>H.Zare</small> 
* ''[[Alnus dolichocarpa]]'' <small>H.Zare, Amini & Assadi</small> 
* ''[[Alnus fauriei]]'' <small>H.Lév. & Vaniot</small> 
* ''[[Alnus ferdinandi-coburgii]]'' <small>C.K.Schneid.</small> 
* ''[[Alnus hakkodensis]]'' <small>Hayashi</small> 
* ''[[Alnus henryi]]'' <small>C.K.Schneid.</small> 
* †''[[Alnus heterodonta]]'' <small>(Newberry) Meyer & Manchester 1987</small> 
* ''[[Alnus lanata]]'' <small>Duthie ex Bean</small> 
* ''[[Alnus mairei]]'' <small>H.Lév.</small> 
* ''[[Alnus paniculata]]'' <small>Nakai</small> 
* ''[[Alnus serrulatoides]]'' <small>Callier</small> 
* ''[[Alnus vermicularis]]'' <small>Nakai</small> 
{{div col end}}

==Nexus externi==
{{fontes biologici}}

{{biologia-stipula}}

[[Categoria:Arbores]]
[[Categoria:Betulaceae]]
[[Categoria:Taxa Miller]]

{{Myrias|Biologia}}