杨树

{{Automatic Taxobox
| image = PopulusCanadensisTREES.jpg
| image_caption =加拿大楊 Populus x canadensis
| taxon = Populus
| authority = L., 1753
|type species =银白杨
Populus alba
|type species authority = L., 1753
| subdivision_ranks = -{zh-hans:组;zh-hant:節}-
| subdivision =
節}- P. sect. Populus*
節}- P. sect. Aegiros*
節}- P. sect. Tacamahaca*
節}- P. sect. Leucoides*
節}- P. sect. Turanga*
| synonyms =
}}

杨属（）属于杨柳科，包含了胡杨、白杨、棉白杨等，通称杨树。杨属植物为落叶乔木，在落叶前叶子变黄。与柳属植物相同，杨属植物的根部有着较强的侵略性，所以它们不能被种植在房屋和水管附近。该属大多数种（如灰杨、加楊，特别是胡杨）都很耐盐。

形态特征
其樹皮在為成長期間之前光滑，但很多老樹就會開裂。枝较小且具有顶芽，芽鳞在2枚以上。单叶。雌雄异株，柔荑花序，没有花瓣，有环状花盘及苞片。种子小，具冠毛。在春季会出现飘花絮现象。

经济价值
杨属中的杨树在中国大陆被广泛利用于荒山开发、农田林网营建以及四旁绿化。华北地区尤甚。
||Populus problematica |Knowlton, 1893
||Populus protozaddachi |Dawson, 1882
||Populus pruinosa |Schrenk
||Populus przewalskii |Maxim.
||Populus pseudocredneria |Cockerell, 1908
||Populus pseudoglauca |Z.Wang & P.Y.Fu
||Populus pseudograndidentata |Dode
||Populus pseudomaximowiczii |Z.Wang & S.L.Tung
||Populus pseudosimonii |Kitag.
||Populus pseudotremuloides |Hollick, 1906
||Populus pubescens |(Parl.) Jovan. & Tucovic
||Populus purdomii |Rehder
||Populus puschkinii |R.I.Schröd.
||Populus pyrifolia |Kirchner, 1898
||Populus qamdoensis |Z.Wang & S.L.Tung
||Populus qiongdaoensis |T.Hong & P.Luo
||Populus rectinervata |Dawson, 1882
||Populus reticulata |Raf.
||Populus rhomboidea |Newberry, 1859
||Populus ricei |Fontaine, 1905
||Populus richardsoni |Heer, 1868
||Populus robusta |Dode, 1905
||Populus roegneriana |Anonymus
||Populus rotundifolia |Griff.
||Populus russelli |Knowlton, 1893
||Populus schneideri |(Rehder) N.Chao
||Populus schroederiana |Dode
||Populus scudderi |Cockerell, 1906
||Populus scythica |Dode
||Populus serrata |
||Populus shanxiensis |Z.Wang & S.L.Tung
||Populus sieboldii |Miq.
||Populus simaroa |Rzed.
||Populus simonii |Carrière
||Populus sinensis |Dode
||Populus sinuata |Dode
||Populus sinxiangensis |T.B.Chao
||Populus smilacifolia |Newberry, 1868
||Populus songarica |Mscr.
||Populus sonorensis |Axelrod, 1939
||Populus speciosa |Ward, 1885
||Populus stygia |Heer, 1873
||Populus suaveolens |Fisch.
||Populus suaveolens |Fisch. ex Camuzet, 1829
||Populus subrotunda |Lesquereux, 1868
||Populus sunghoensis |T.B.Chao & C.W.Chiuan
||Populus sylvicola |Dode
||Populus szechuanica |C.K.Schneid.
||Populus talassica |Kom.
||Populus tenuinervata |Lesquereux, 1888
||Populus thracia |Dode
||Populus tibetica |Mscr.
||Populus tidwellii |Manchester et al., 2006
||Populus tomentosa |Carrière
||Populus trabutiana |Dode
||Populus tremula |L.
||Populus tremuloides |Michx.
||Populus treyviana |Dode
||Populus trichocarpa |Torr. & A.Gray ex Hook.
||Populus trichocarpa |Torrey & A.Gray
||Populus trinervifolia |Doweld
||Populus trinervis |Dawson, 1882
||Populus tristis |Fisch. ex Dippel
||Populus tschoudiana |Dode
||Populus undulata |
||Populus ungeri |Lesquereux, 1878
||Populus vaillantiana |Dode
||Populus valida |Dode
||Populus violascens |Dode
||Populus vivaria |Knowlton, 1899
||Populus wardii |Knowlton, 1900
||Populus washingtonensis |Knowlton, 1926
||Populus wenxianica |Z.C.Feng & J.L.Guo
||Populus wenxianica |Z.C.Feng & J.L.Guo ex G.H.Zhu
||Populus whitei |Ward, 1885
||Populus wilsonii |C.K.Schneid.
||Populus wolfgangii |Janch.
||Populus wolfiana |Dode
||Populus wuana |Z.Wang & S.L.Tung
||Populus wulianensis |S.B.Liang & X.W.Li
||Populus xantholithensis |Knowlton, 1899
||Populus xiangchengensis |Z.Wang & S.L.Tung
||Populus xintercurrens |Goodrich & S.L.Welsh
||Populus yatungensis |(Z.Wang & P.Y.Fu) Z.Wang & S.L.Tung
||Populus yuana |Z.Wang & S.L.Tung
||Populus yunnanensis |Dode
||Populus yunsiaomanshanensis |T.B.Chao & C.W.Chiuan
||Populus yunsiaoshanensis |T.B.Chao & C.W.Chiuan
||Populus yunungii |G.L.Lu
||Populus zaddachi |Heer, 1859
||Populus zhenyuanensis |Liang & Zhou, 2016
}}
;杂交种：

害蟲

• 杨潜叶跳象 Rhynchaenus empopulifolis Chen：鞘翅目象甲蟲科物種，1980年代開始為禍中國東北地區的楊林，寄生於小葉楊（Populus simonii Carr.）、青楊（Populus cathayana Rehd.）、北京楊（Populus pekinensis Hsü）及加拿大楊（Populus canadensis Moench.）等物種。

参考文献
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